diff --git a/northd/ovn-northd.c b/northd/ovn-northd.c
index ac872aade..cc228fd96 100644
--- a/northd/ovn-northd.c
+++ b/northd/ovn-northd.c
@@ -602,6 +602,19 @@ ovn_mcast_group_allocate_key(struct mcast_info *mcast_info)
                               &mcast_info->group_tnlid_hint);
 }
 
+struct ovn_l3dgw_port {
+    /* OVN northd only needs to know about the logical router gateway port for
+     * NAT on a distributed router.  This "distributed gateway port" is
+     * populated only when there is a gateway chassis or ha chassis group
+     * specified for one of the ports on the logical router. Otherwise this
+     * will be NULL. */
+    struct ovn_port *dgw_port;
+
+    /* The "derived" OVN port representing the instance of l3dgw_port on
+     * the gateway chassis. */
+    struct ovn_port *redirect_port;
+};
+
 /* The 'key' comes from nbs->header_.uuid or nbr->header_.uuid or
  * sb->external_ids:logical-switch. */
 struct ovn_datapath {
@@ -633,14 +646,9 @@ struct ovn_datapath {
     /* Multicast data. */
     struct mcast_info mcast_info;
 
-    /* OVN northd only needs to know about the logical router gateway port for
-     * NAT on a distributed router.  This "distributed gateway port" is
-     * populated only when there is a gateway chassis specified for one of
-     * the ports on the logical router.  Otherwise this will be NULL. */
-    struct ovn_port *l3dgw_port;
-    /* The "derived" OVN port representing the instance of l3dgw_port on
-     * the gateway chassis. */
-    struct ovn_port *l3redirect_port;
+    /* L3 distributed gateway ports */
+    struct ovn_l3dgw_port *l3dgw_ports;
+    size_t n_l3dgw_ports;
 
     /* NAT entries configured on the router. */
     struct ovn_nat *nat_entries;
@@ -863,6 +871,7 @@ ovn_datapath_destroy(struct hmap *datapaths, struct ovn_datapath *od)
         ovn_destroy_tnlids(&od->port_tnlids);
         destroy_ipam_info(&od->ipam_info);
         free(od->router_ports);
+        free(od->l3dgw_ports);
         destroy_nat_entries(od);
         free(od->nat_entries);
         free(od->localnet_ports);
@@ -1416,6 +1425,82 @@ struct ovn_port {
     struct ovs_list list;       /* In list of similar records. */
 };
 
+/* Get the l3dgw port corresponding to a logical router port.*/
+static inline struct ovn_l3dgw_port*
+ovn_get_l3dgw_port_from_lrp(const struct ovn_port *op)
+{
+    struct ovn_datapath *od = op->od;
+
+    if (!op || !op->nbrp) {
+        return NULL;
+    }
+
+    for (size_t i = 0; i < od->n_l3dgw_ports; i++) {
+        struct ovn_l3dgw_port *l3dgw_port =
+            &(od->l3dgw_ports[i]);
+        if (op == l3dgw_port->dgw_port) {
+            return l3dgw_port;
+        }
+    }
+
+    return NULL;
+}
+
+/* Get the l3dgw port corresponding to a logical router port
+ * with input ip */
+static struct ovn_l3dgw_port*
+ovn_get_l3dgw_port_from_ip(struct ovn_datapath *od, struct in6_addr ip_addr)
+{
+    if (!od || !od->nbr) {
+        return NULL;
+    }
+
+    for (size_t i = 0; i < od->n_l3dgw_ports; i++) {
+        struct ovn_l3dgw_port *l3dgw_port =
+                                       &(od->l3dgw_ports[i]);
+        struct ovn_port *op = l3dgw_port->dgw_port;
+        struct lport_addresses lrp_networks;
+
+        if (!extract_lrp_networks(op->nbrp, &lrp_networks)) {
+            static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
+            VLOG_WARN_RL(&rl, "Extract addresses failed.");
+            continue;
+        }
+
+        bool is_v4 = IN6_IS_ADDR_V4MAPPED(&ip_addr);
+        if (!is_v4) {
+            for (int j = 0; j < lrp_networks.n_ipv6_addrs; j++) {
+                struct ipv6_netaddr *lrp6_addr =
+                                    &(lrp_networks.ipv6_addrs[j]);
+                struct in6_addr ip6_mask = ipv6_addr_bitand(&lrp6_addr->mask,
+                                                            &ip_addr);
+
+                if (ipv6_addr_equals(&ip6_mask, &(lrp6_addr->network))) {
+                    destroy_lport_addresses(&lrp_networks);
+                    return l3dgw_port;
+                }
+            }
+        } else {
+            for (int j = 0; j < lrp_networks.n_ipv4_addrs; j++) {
+                struct ipv4_netaddr *lrp4_addr =
+                                    &(lrp_networks.ipv4_addrs[j]);
+                uint32_t addr = ntohl(lrp4_addr->addr);
+                uint32_t network = ntohl(lrp4_addr->network);
+                uint32_t mask4 = ntohl(lrp4_addr->mask);
+                uint32_t bcast = addr | ~mask4;
+                uint32_t ip4 = ntohl(in6_addr_get_mapped_ipv4(&ip_addr));
+
+                if (ip4 >= network && ip4 < bcast) {
+                    destroy_lport_addresses(&lrp_networks);
+                    return l3dgw_port;
+                }
+            }
+        }
+    }
+
+    return NULL;
+}
+
 static void
 ovn_port_set_nb(struct ovn_port *op,
                 const struct nbrec_logical_switch_port *nbsp,
@@ -2327,14 +2412,6 @@ join_logical_ports(struct northd_context *ctx,
                                      "on L3 gateway router", nbrp->name);
                         continue;
                     }
-                    if (od->l3dgw_port || od->l3redirect_port) {
-                        static struct vlog_rate_limit rl
-                            = VLOG_RATE_LIMIT_INIT(1, 1);
-                        VLOG_WARN_RL(&rl, "Bad configuration: multiple "
-                                     "distributed gateway ports on logical "
-                                     "router %s", od->nbr->name);
-                        continue;
-                    }
 
                     char *redirect_name =
                         ovn_chassis_redirect_name(nbrp->name);
@@ -2355,8 +2432,12 @@ join_logical_ports(struct northd_context *ctx,
 
                     /* Set l3dgw_port and l3redirect_port in od, for later
                      * use during flow creation. */
-                    od->l3dgw_port = op;
-                    od->l3redirect_port = crp;
+                    od->l3dgw_ports = xrealloc(od->l3dgw_ports,
+                                               sizeof *od->l3dgw_ports *
+                                               (od->n_l3dgw_ports + 1));
+                    od->l3dgw_ports[od->n_l3dgw_ports].dgw_port = op;
+                    od->l3dgw_ports[od->n_l3dgw_ports].redirect_port = crp;
+                    od->n_l3dgw_ports++;
                 }
             }
         }
@@ -2512,7 +2593,7 @@ get_nat_addresses(const struct ovn_port *op, size_t *n)
 
         /* Determine whether this NAT rule satisfies the conditions for
          * distributed NAT processing. */
-        if (op->od->l3redirect_port && !strcmp(nat->type, "dnat_and_snat")
+        if (op->od->n_l3dgw_ports && !strcmp(nat->type, "dnat_and_snat")
             && nat->logical_port && nat->external_mac) {
             /* Distributed NAT rule. */
             if (eth_addr_from_string(nat->external_mac, &mac)) {
@@ -2572,11 +2653,13 @@ get_nat_addresses(const struct ovn_port *op, size_t *n)
     sset_destroy(&all_ips_v6);
 
     if (central_ip_address) {
+        struct ovn_l3dgw_port *l3dgw_port =
+            ovn_get_l3dgw_port_from_lrp(op);
         /* Gratuitous ARP for centralized NAT rules on distributed gateway
          * ports should be restricted to the gateway chassis. */
-        if (op->od->l3redirect_port) {
+        if (l3dgw_port) {
             ds_put_format(&c_addresses, " is_chassis_resident(%s)",
-                          op->od->l3redirect_port->json_key);
+                          l3dgw_port->redirect_port->json_key);
         }
 
         addresses[n_nats++] = ds_steal_cstr(&c_addresses);
@@ -3075,7 +3158,7 @@ ovn_port_update_sbrec(struct northd_context *ctx,
             char **nats = NULL;
             if (nat_addresses && !strcmp(nat_addresses, "router")) {
                 if (op->peer && op->peer->od
-                    && (chassis || op->peer->od->l3redirect_port)) {
+                    && (chassis || op->peer->od->n_l3dgw_ports)) {
                     nats = get_nat_addresses(op->peer, &n_nats);
                 }
             /* Only accept manual specification of ethernet address
@@ -3111,12 +3194,13 @@ ovn_port_update_sbrec(struct northd_context *ctx,
              * sending the GARPs for the router port IPs.
              * */
             bool add_router_port_garp = false;
-            if (op->peer && op->peer->nbrp && op->peer->od->l3dgw_port &&
-                op->peer->od->l3redirect_port &&
-                (smap_get_bool(&op->peer->nbrp->options,
-                              "reside-on-redirect-chassis", false) ||
-                op->peer == op->peer->od->l3dgw_port)) {
+            struct ovn_l3dgw_port *l3dgw_port = NULL;
+            if (op->peer && op->peer->nbrp && op->peer->od->n_l3dgw_ports) {
+              l3dgw_port = ovn_get_l3dgw_port_from_lrp(op->peer);
+              if (smap_get_bool(&op->peer->nbrp->options,
+                  "reside-on-redirect-chassis", false) || l3dgw_port) {
                 add_router_port_garp = true;
+              }
             } else if (chassis && op->od->n_localnet_ports) {
                 add_router_port_garp = true;
             }
@@ -3130,9 +3214,12 @@ ovn_port_update_sbrec(struct northd_context *ctx,
                                   op->peer->lrp_networks.ipv4_addrs[i].addr_s);
                 }
 
-                if (op->peer->od->l3redirect_port) {
+                if (op->peer->od->n_l3dgw_ports == 1) {
+                    if (!l3dgw_port) {
+                        l3dgw_port = &op->peer->od->l3dgw_ports[0];
+                    }
                     ds_put_format(&garp_info, " is_chassis_resident(%s)",
-                                  op->peer->od->l3redirect_port->json_key);
+                                  l3dgw_port->redirect_port->json_key);
                 }
 
                 n_nats++;
@@ -6156,13 +6243,16 @@ build_lrouter_groups__(struct hmap *ports, struct ovn_datapath *od)
 {
     ovs_assert((od && od->nbr && od->lr_group));
 
-    if (od->l3dgw_port && od->l3redirect_port) {
+    for (size_t i = 0; i < od->n_l3dgw_ports; i++) {
+        struct ovn_l3dgw_port *l3dgw_port =
+            &(od->l3dgw_ports[i]);
+
         /* It's a logical router with gateway port. If it
          * has HA_Chassis_Group associated to it in SB DB, then store the
          * ha chassis group name. */
-        if (od->l3redirect_port->sb->ha_chassis_group) {
+        if (l3dgw_port->redirect_port->sb->ha_chassis_group) {
             sset_add(&od->lr_group->ha_chassis_groups,
-                     od->l3redirect_port->sb->ha_chassis_group->name);
+                     l3dgw_port->redirect_port->sb->ha_chassis_group->name);
         }
     }
 
@@ -7413,24 +7503,28 @@ build_lswitch_ip_unicast_lookup(struct ovn_port *op,
                 ds_clear(match);
                 ds_put_format(match, "eth.dst == "ETH_ADDR_FMT,
                               ETH_ADDR_ARGS(mac));
-                if (op->peer->od->l3dgw_port
-                    && op->peer->od->l3redirect_port
-                    && op->od->n_localnet_ports) {
+                if (op->peer->od->n_l3dgw_ports &&
+                    op->od->n_localnet_ports) {
                     bool add_chassis_resident_check = false;
-                    if (op->peer == op->peer->od->l3dgw_port) {
+                    struct ovn_l3dgw_port *l3dgw_port =
+                        ovn_get_l3dgw_port_from_lrp(op->peer);
+                    if (l3dgw_port) {
                         /* The peer of this port represents a distributed
                          * gateway port. The destination lookup flow for the
                          * router's distributed gateway port MAC address should
                          * only be programmed on the gateway chassis. */
                         add_chassis_resident_check = true;
-                    } else {
+                    } else if (op->peer->od->n_l3dgw_ports == 1) {
                         /* Check if the option 'reside-on-redirect-chassis'
                          * is set to true on the peer port. If set to true
                          * and if the logical switch has a localnet port, it
                          * means the router pipeline for the packets from
                          * this logical switch should be run on the chassis
                          * hosting the gateway port.
+                         * 'reside-on-redirect-chassis' is supported only for
+                         * logical routers with single l3dgw port.
                          */
+                        l3dgw_port = &op->peer->od->l3dgw_ports[0];
                         add_chassis_resident_check = smap_get_bool(
                             &op->peer->nbrp->options,
                             "reside-on-redirect-chassis", false);
@@ -7438,7 +7532,7 @@ build_lswitch_ip_unicast_lookup(struct ovn_port *op,
 
                     if (add_chassis_resident_check) {
                         ds_put_format(match, " && is_chassis_resident(%s)",
-                                      op->peer->od->l3redirect_port->json_key);
+                                      l3dgw_port->redirect_port->json_key);
                     }
                 }
 
@@ -7451,8 +7545,7 @@ build_lswitch_ip_unicast_lookup(struct ovn_port *op,
 
                 /* Add ethernet addresses specified in NAT rules on
                  * distributed logical routers. */
-                if (op->peer->od->l3dgw_port
-                    && op->peer == op->peer->od->l3dgw_port) {
+                if (ovn_get_l3dgw_port_from_lrp(op->peer)) {
                     for (int j = 0; j < op->peer->od->nbr->n_nat; j++) {
                         const struct nbrec_nat *nat
                                                   = op->peer->od->nbr->nat[j];
@@ -8583,33 +8676,49 @@ add_router_lb_flow(struct hmap *lflows, struct ovn_datapath *od,
     build_empty_lb_event_flow(od, lflows, lb_vip, lb, S_ROUTER_IN_DNAT,
                               meter_groups);
 
-    /* A match and actions for new connections. */
-    char *new_match = xasprintf("ct.new && %s", ds_cstr(match));
-    if (lb_force_snat_ip) {
-        char *new_actions = xasprintf("flags.force_snat_for_lb = 1; %s",
-                                      ds_cstr(actions));
-        ovn_lflow_add_with_hint(lflows, od, S_ROUTER_IN_DNAT, priority,
-                                new_match, new_actions, &lb->header_);
-        free(new_actions);
-    } else {
-        ovn_lflow_add_with_hint(lflows, od, S_ROUTER_IN_DNAT, priority,
-                                new_match, ds_cstr(actions), &lb->header_);
-    }
+    for (size_t i = 0; i < od->n_l3dgw_ports; i++) {
+        struct ovn_l3dgw_port *l3dgw_port = &(od->l3dgw_ports[i]);
 
-    /* A match and actions for established connections. */
-    char *est_match = xasprintf("ct.est && %s", ds_cstr(match));
-    if (lb_force_snat_ip) {
-        ovn_lflow_add_with_hint(lflows, od, S_ROUTER_IN_DNAT, priority,
-                                est_match,
-                                "flags.force_snat_for_lb = 1; ct_dnat;",
-                                &lb->header_);
-    } else {
-        ovn_lflow_add_with_hint(lflows, od, S_ROUTER_IN_DNAT, priority,
-                                est_match, "ct_dnat;", &lb->header_);
-    }
+        char *new_match = NULL;
+        if (lb_vip->n_backends || !lb_vip->empty_backend_rej) {
+          /* A match and actions for new connections. */
+          new_match = xasprintf("ct.new && %s && inport == %s && "
+                                "is_chassis_resident(%s)", ds_cstr(match),
+                                l3dgw_port->dgw_port->json_key,
+                                l3dgw_port->redirect_port->json_key);
+        } else {
+          new_match = xasprintf("ct.new && %s", ds_cstr(match));
+        }
 
-    free(new_match);
-    free(est_match);
+        if (lb_force_snat_ip) {
+            char *new_actions = xasprintf("flags.force_snat_for_lb = 1; %s",
+                                          ds_cstr(actions));
+            ovn_lflow_add_with_hint(lflows, od, S_ROUTER_IN_DNAT, priority,
+                                    new_match, new_actions, &lb->header_);
+            free(new_actions);
+        } else {
+            ovn_lflow_add_with_hint(lflows, od, S_ROUTER_IN_DNAT, priority,
+                                    new_match, ds_cstr(actions), &lb->header_);
+        }
+
+        /* A match and actions for established connections. */
+        char *est_match = xasprintf("ct.est && %s && inport == %s && "
+                                    "is_chassis_resident(%s)", ds_cstr(match),
+                                    l3dgw_port->dgw_port->json_key,
+                                    l3dgw_port->redirect_port->json_key);
+        if (lb_force_snat_ip) {
+            ovn_lflow_add_with_hint(lflows, od, S_ROUTER_IN_DNAT, priority,
+                                    est_match,
+                                    "flags.force_snat_for_lb = 1; ct_dnat;",
+                                    &lb->header_);
+        } else {
+            ovn_lflow_add_with_hint(lflows, od, S_ROUTER_IN_DNAT, priority,
+                                    est_match, "ct_dnat;", &lb->header_);
+        }
+
+        free(new_match);
+        free(est_match);
+    }
 
     const char *ip_match = NULL;
     if (IN6_IS_ADDR_V4MAPPED(&lb_vip->vip)) {
@@ -8644,49 +8753,55 @@ add_router_lb_flow(struct hmap *lflows, struct ovn_datapath *od,
         ds_destroy(&unsnat_match);
     }
 
-    if (!od->l3dgw_port || !od->l3redirect_port || !lb_vip->n_backends) {
+    if (!od->n_l3dgw_ports || !lb_vip->n_backends) {
         return;
     }
 
-    /* Add logical flows to UNDNAT the load balanced reverse traffic in
-     * the router egress pipleine stage - S_ROUTER_OUT_UNDNAT if the logical
-     * router has a gateway router port associated.
-     */
-    struct ds undnat_match = DS_EMPTY_INITIALIZER;
-    ds_put_format(&undnat_match, "%s && (", ip_match);
+    for (size_t i = 0; i < od->n_l3dgw_ports; i++) {
 
-    for (size_t i = 0; i < lb_vip->n_backends; i++) {
-        struct ovn_lb_backend *backend = &lb_vip->backends[i];
-        ds_put_format(&undnat_match, "(%s.src == %s", ip_match,
-                      backend->ip_str);
+        /* Add logical flows to UNDNAT the load balanced reverse traffic in
+         * the router egress pipleine stage - S_ROUTER_OUT_UNDNAT if the
+         * logical router has a gateway router port associated.
+         */
+        struct ds undnat_match = DS_EMPTY_INITIALIZER;
+        ds_put_format(&undnat_match, "%s && (", ip_match);
+
+        struct ovn_l3dgw_port *l3dgw_port = &od->l3dgw_ports[i];
+
+        for (size_t j = 0; j < lb_vip->n_backends; j++) {
+            struct ovn_lb_backend *backend = &lb_vip->backends[j];
+            ds_put_format(&undnat_match, "(%s.src == %s", ip_match,
+                          backend->ip_str);
 
-        if (backend->port) {
-            ds_put_format(&undnat_match, " && %s.src == %d) || ",
-                          proto, backend->port);
+            if (backend->port) {
+                ds_put_format(&undnat_match, " && %s.src == %d) || ",
+                              proto, backend->port);
+            } else {
+                ds_put_cstr(&undnat_match, ") || ");
+            }
+        }
+
+        ds_chomp(&undnat_match, ' ');
+        ds_chomp(&undnat_match, '|');
+        ds_chomp(&undnat_match, '|');
+        ds_chomp(&undnat_match, ' ');
+        ds_put_format(&undnat_match, ") && outport == %s && "
+                      "is_chassis_resident(%s)",
+                      l3dgw_port->dgw_port->json_key,
+                      l3dgw_port->redirect_port->json_key);
+        if (lb_force_snat_ip) {
+            ovn_lflow_add_with_hint(lflows, od, S_ROUTER_OUT_UNDNAT, 120,
+                    ds_cstr(&undnat_match),
+                    "flags.force_snat_for_lb = 1; ct_dnat;",
+                    &lb->header_);
         } else {
-            ds_put_cstr(&undnat_match, ") || ");
-        }
-    }
-
-    ds_chomp(&undnat_match, ' ');
-    ds_chomp(&undnat_match, '|');
-    ds_chomp(&undnat_match, '|');
-    ds_chomp(&undnat_match, ' ');
-    ds_put_format(&undnat_match, ") && outport == %s && "
-                 "is_chassis_resident(%s)", od->l3dgw_port->json_key,
-                 od->l3redirect_port->json_key);
-    if (lb_force_snat_ip) {
-        ovn_lflow_add_with_hint(lflows, od, S_ROUTER_OUT_UNDNAT, 120,
-                                ds_cstr(&undnat_match),
-                                "flags.force_snat_for_lb = 1; ct_dnat;",
-                                &lb->header_);
-    } else {
-        ovn_lflow_add_with_hint(lflows, od, S_ROUTER_OUT_UNDNAT, 120,
-                                ds_cstr(&undnat_match), "ct_dnat;",
-                                &lb->header_);
-    }
+            ovn_lflow_add_with_hint(lflows, od, S_ROUTER_OUT_UNDNAT, 120,
+                    ds_cstr(&undnat_match), "ct_dnat;",
+                    &lb->header_);
+        }
 
-    ds_destroy(&undnat_match);
+        ds_destroy(&undnat_match);
+    }
 }
 
 #define ND_RA_MAX_INTERVAL_MAX 1800
@@ -8808,7 +8923,7 @@ lrouter_nat_add_ext_ip_match(struct ovn_datapath *od,
 {
     struct nbrec_address_set *allowed_ext_ips = nat->allowed_ext_ips;
     struct nbrec_address_set *exempted_ext_ips = nat->exempted_ext_ips;
-    bool is_gw_router = !od->l3dgw_port;
+    bool is_gw_router = !od->n_l3dgw_ports;
 
     ovs_assert(allowed_ext_ips || exempted_ext_ips);
 
@@ -9023,9 +9138,11 @@ build_lrouter_port_nat_arp_nd_flow(struct ovn_port *op,
          * upstream MAC learning points to the gateway chassis.
          * Also need to avoid generation of multiple ARP responses
          * from different chassis. */
-        if (op->od->l3redirect_port) {
+        if (op->od->n_l3dgw_ports) {
+            struct ovn_l3dgw_port *l3dgw_port =
+                ovn_get_l3dgw_port_from_lrp(op);
             ds_put_format(&match, "is_chassis_resident(%s)",
-                          op->od->l3redirect_port->json_key);
+                          l3dgw_port->redirect_port->json_key);
         }
     }
 
@@ -9270,6 +9387,8 @@ build_adm_ctrl_flows_for_lrouter_port(
         struct ovn_port *op, struct hmap *lflows,
         struct ds *match, struct ds *actions)
 {
+    struct ovn_l3dgw_port *l3dgw_port = NULL;
+
     if (op->nbrp) {
         if (!lrport_is_enabled(op->nbrp)) {
             /* Drop packets from disabled logical ports (since logical flow
@@ -9300,12 +9419,12 @@ build_adm_ctrl_flows_for_lrouter_port(
         ds_clear(match);
         ds_put_format(match, "eth.dst == %s && inport == %s",
                       op->lrp_networks.ea_s, op->json_key);
-        if (op->od->l3dgw_port && op == op->od->l3dgw_port
-            && op->od->l3redirect_port) {
+        l3dgw_port = ovn_get_l3dgw_port_from_lrp(op);
+        if (l3dgw_port) {
             /* Traffic with eth.dst = l3dgw_port->lrp_networks.ea_s
              * should only be received on the gateway chassis. */
             ds_put_format(match, " && is_chassis_resident(%s)",
-                          op->od->l3redirect_port->json_key);
+                          l3dgw_port->redirect_port->json_key);
         }
         ovn_lflow_add_with_hint(lflows, op->od, S_ROUTER_IN_ADMISSION, 50,
                                 ds_cstr(match),  ds_cstr(actions),
@@ -9425,6 +9544,8 @@ build_neigh_learning_flows_for_lrouter_port(
 
         /* Check if we need to learn mac-binding from ARP requests. */
         for (int i = 0; i < op->lrp_networks.n_ipv4_addrs; i++) {
+            struct ovn_l3dgw_port *l3dgw_port =
+                ovn_get_l3dgw_port_from_lrp(op);
             if (!learn_from_arp_request) {
                 /* ARP request to this address should always get learned,
                  * so add a priority-110 flow to set
@@ -9437,10 +9558,9 @@ build_neigh_learning_flows_for_lrouter_port(
                               op->lrp_networks.ipv4_addrs[i].network_s,
                               op->lrp_networks.ipv4_addrs[i].plen,
                               op->lrp_networks.ipv4_addrs[i].addr_s);
-                if (op->od->l3dgw_port && op == op->od->l3dgw_port
-                    && op->od->l3redirect_port) {
+                if (l3dgw_port) {
                     ds_put_format(match, " && is_chassis_resident(%s)",
-                                  op->od->l3redirect_port->json_key);
+                                  l3dgw_port->redirect_port->json_key);
                 }
                 const char *actions_s = REGBIT_LOOKUP_NEIGHBOR_RESULT
                                   " = lookup_arp(inport, arp.spa, arp.sha); "
@@ -9457,10 +9577,9 @@ build_neigh_learning_flows_for_lrouter_port(
                           op->json_key,
                           op->lrp_networks.ipv4_addrs[i].network_s,
                           op->lrp_networks.ipv4_addrs[i].plen);
-            if (op->od->l3dgw_port && op == op->od->l3dgw_port
-                && op->od->l3redirect_port) {
+            if (l3dgw_port) {
                 ds_put_format(match, " && is_chassis_resident(%s)",
-                              op->od->l3redirect_port->json_key);
+                              l3dgw_port->redirect_port->json_key);
             }
             ds_clear(actions);
             ds_put_format(actions, REGBIT_LOOKUP_NEIGHBOR_RESULT
@@ -9885,7 +10004,10 @@ build_arp_resolve_flows_for_lrouter_port(
             }
         }
 
-        if (!op->derived && op->od->l3redirect_port) {
+        struct ovn_l3dgw_port *l3dgw_port =
+            ovn_get_l3dgw_port_from_lrp(op);
+
+        if (!op->derived && l3dgw_port) {
             const char *redirect_type = smap_get(&op->nbrp->options,
                                                  "redirect-type");
             if (redirect_type && !strcasecmp(redirect_type, "bridged")) {
@@ -9898,7 +10020,7 @@ build_arp_resolve_flows_for_lrouter_port(
                 ds_clear(match);
                 ds_put_format(match, "outport == %s && "
                               "!is_chassis_resident(%s)", op->json_key,
-                              op->od->l3redirect_port->json_key);
+                              l3dgw_port->redirect_port->json_key);
                 ds_clear(actions);
                 ds_put_format(actions, "eth.dst = %s; next;",
                               op->lrp_networks.ea_s);
@@ -10209,11 +10331,13 @@ build_check_pkt_len_flows_for_lrouter(
         ovn_lflow_add(lflows, od, S_ROUTER_IN_LARGER_PKTS, 0, "1",
                       "next;");
 
-        if (od->l3dgw_port && od->l3redirect_port) {
+        for (size_t i = 0; i < od->n_l3dgw_ports; i++) {
             int gw_mtu = 0;
-            if (od->l3dgw_port->nbrp) {
-                 gw_mtu = smap_get_int(&od->l3dgw_port->nbrp->options,
-                                       "gateway_mtu", 0);
+            struct ovn_l3dgw_port *l3dgw_port = &od->l3dgw_ports[i];
+
+            if (l3dgw_port->dgw_port->nbrp) {
+                gw_mtu = smap_get_int(&(l3dgw_port->dgw_port->nbrp->options),
+                                      "gateway_mtu", 0);
             }
             /* Add the flows only if gateway_mtu is configured. */
             if (gw_mtu <= 0) {
@@ -10221,20 +10345,20 @@ build_check_pkt_len_flows_for_lrouter(
             }
 
             ds_clear(match);
-            ds_put_format(match, "outport == %s", od->l3dgw_port->json_key);
-
+            ds_put_format(match, "outport == %s",
+                          l3dgw_port->dgw_port->json_key);
             ds_clear(actions);
             ds_put_format(actions,
                           REGBIT_PKT_LARGER" = check_pkt_larger(%d);"
                           " next;", gw_mtu + VLAN_ETH_HEADER_LEN);
             ovn_lflow_add_with_hint(lflows, od, S_ROUTER_IN_CHK_PKT_LEN, 50,
                                     ds_cstr(match), ds_cstr(actions),
-                                    &od->l3dgw_port->nbrp->header_);
+                                    &l3dgw_port->dgw_port->nbrp->header_);
 
-            for (size_t i = 0; i < od->nbr->n_ports; i++) {
+            for (size_t j = 0; j < od->nbr->n_ports; j++) {
                 struct ovn_port *rp = ovn_port_find(ports,
-                                                    od->nbr->ports[i]->name);
-                if (!rp || rp == od->l3dgw_port) {
+                                                    od->nbr->ports[j]->name);
+                if (rp == l3dgw_port->dgw_port) {
                     continue;
                 }
 
@@ -10242,7 +10366,8 @@ build_check_pkt_len_flows_for_lrouter(
                     ds_clear(match);
                     ds_put_format(match, "inport == %s && outport == %s"
                                   " && ip4 && "REGBIT_PKT_LARGER,
-                                  rp->json_key, od->l3dgw_port->json_key);
+                                  rp->json_key,
+                                  l3dgw_port->dgw_port->json_key);
 
                     ds_clear(actions);
                     /* Set icmp4.frag_mtu to gw_mtu */
@@ -10271,7 +10396,8 @@ build_check_pkt_len_flows_for_lrouter(
                     ds_clear(match);
                     ds_put_format(match, "inport == %s && outport == %s"
                                   " && ip6 && "REGBIT_PKT_LARGER,
-                                  rp->json_key, od->l3dgw_port->json_key);
+                                  rp->json_key,
+                                  l3dgw_port->dgw_port->json_key);
 
                     ds_clear(actions);
                     /* Set icmp6.frag_mtu to gw_mtu */
@@ -10313,11 +10439,13 @@ build_gateway_redirect_flows_for_lrouter(
         struct ds *match, struct ds *actions)
 {
     if (od->nbr) {
-        if (od->l3dgw_port && od->l3redirect_port) {
+        for (size_t i = 0; i < od->n_l3dgw_ports; i++) {
             const struct ovsdb_idl_row *stage_hint = NULL;
 
-            if (od->l3dgw_port->nbrp) {
-                stage_hint = &od->l3dgw_port->nbrp->header_;
+            struct ovn_l3dgw_port *l3dgw_port = &od->l3dgw_ports[i];
+
+            if (l3dgw_port->dgw_port->nbrp) {
+                stage_hint = &l3dgw_port->dgw_port->nbrp->header_;
             }
 
             /* For traffic with outport == l3dgw_port, if the
@@ -10326,12 +10454,12 @@ build_gateway_redirect_flows_for_lrouter(
              * instance of the l3dgw_port. */
             ds_clear(match);
             ds_put_format(match, "outport == %s",
-                          od->l3dgw_port->json_key);
+                l3dgw_port->dgw_port->json_key);
             ds_clear(actions);
             ds_put_format(actions, "outport = %s; next;",
-                          od->l3redirect_port->json_key);
-            ovn_lflow_add_with_hint(lflows, od, S_ROUTER_IN_GW_REDIRECT, 50,
-                                    ds_cstr(match), ds_cstr(actions),
+                          l3dgw_port->redirect_port->json_key);
+            ovn_lflow_add_with_hint(lflows, od, S_ROUTER_IN_GW_REDIRECT,
+                                    50, ds_cstr(match), ds_cstr(actions),
                                     stage_hint);
         }
 
@@ -10562,16 +10690,17 @@ build_ipv6_input_flows_for_lrouter_port(
         /* ND reply.  These flows reply to ND solicitations for the
          * router's own IP address. */
         for (int i = 0; i < op->lrp_networks.n_ipv6_addrs; i++) {
+            struct ovn_l3dgw_port *l3dgw_port =
+                ovn_get_l3dgw_port_from_lrp(op);
             ds_clear(match);
-            if (op->od->l3dgw_port && op == op->od->l3dgw_port
-                && op->od->l3redirect_port) {
+            if (l3dgw_port) {
                 /* Traffic with eth.src = l3dgw_port->lrp_networks.ea_s
                  * should only be sent from the gateway chassi, so that
                  * upstream MAC learning points to the gateway chassis.
                  * Also need to avoid generation of multiple ND replies
                  * from different chassis. */
                 ds_put_format(match, "is_chassis_resident(%s)",
-                              op->od->l3redirect_port->json_key);
+                              l3dgw_port->redirect_port->json_key);
             }
 
             build_lrouter_nd_flow(op->od, op, "nd_na_router",
@@ -10583,7 +10712,7 @@ build_ipv6_input_flows_for_lrouter_port(
 
         /* UDP/TCP/SCTP port unreachable */
         if (!smap_get(&op->od->nbr->options, "chassis")
-            && !op->od->l3dgw_port) {
+            && !op->od->n_l3dgw_ports) {
             for (int i = 0; i < op->lrp_networks.n_ipv6_addrs; i++) {
                 ds_clear(match);
                 ds_put_format(match,
@@ -10799,17 +10928,19 @@ build_lrouter_ipv4_ip_input(struct ovn_port *op,
                           op->lrp_networks.ipv4_addrs[i].network_s,
                           op->lrp_networks.ipv4_addrs[i].plen);
 
-            if (op->od->l3dgw_port && op->od->l3redirect_port && op->peer
+            if (op->od->n_l3dgw_ports && op->peer
                 && op->peer->od->n_localnet_ports) {
                 bool add_chassis_resident_check = false;
-                if (op == op->od->l3dgw_port) {
+                struct ovn_l3dgw_port *l3dgw_port =
+                    ovn_get_l3dgw_port_from_lrp(op);
+                if (l3dgw_port) {
                     /* Traffic with eth.src = l3dgw_port->lrp_networks.ea_s
                      * should only be sent from the gateway chassis, so that
                      * upstream MAC learning points to the gateway chassis.
                      * Also need to avoid generation of multiple ARP responses
                      * from different chassis. */
                     add_chassis_resident_check = true;
-                } else {
+                } else if (op->od->n_l3dgw_ports == 1) {
                     /* Check if the option 'reside-on-redirect-chassis'
                      * is set to true on the router port. If set to true
                      * and if peer's logical switch has a localnet port, it
@@ -10817,7 +10948,10 @@ build_lrouter_ipv4_ip_input(struct ovn_port *op,
                      * peer's logical switch is be run on the chassis
                      * hosting the gateway port and it should reply to the
                      * ARP requests for the router port IPs.
+                     * 'reside-on-redirect-chassis' is supported only for
+                     * logical routers with single l3dgw port.
                      */
+                    l3dgw_port = &op->od->l3dgw_ports[0];
                     add_chassis_resident_check = smap_get_bool(
                         &op->nbrp->options,
                         "reside-on-redirect-chassis", false);
@@ -10825,7 +10959,7 @@ build_lrouter_ipv4_ip_input(struct ovn_port *op,
 
                 if (add_chassis_resident_check) {
                     ds_put_format(match, " && is_chassis_resident(%s)",
-                                  op->od->l3redirect_port->json_key);
+                                  l3dgw_port->redirect_port->json_key);
                 }
             }
 
@@ -10840,12 +10974,13 @@ build_lrouter_ipv4_ip_input(struct ovn_port *op,
         struct sset all_ips_v6 = SSET_INITIALIZER(&all_ips_v6);
         get_router_load_balancer_ips(op->od, &all_ips_v4, &all_ips_v6);
 
+        struct ovn_l3dgw_port *l3dgw_port = ovn_get_l3dgw_port_from_lrp(op);
         const char *ip_address;
         SSET_FOR_EACH (ip_address, &all_ips_v4) {
             ds_clear(match);
-            if (op == op->od->l3dgw_port) {
+            if (l3dgw_port) {
                 ds_put_format(match, "is_chassis_resident(%s)",
-                              op->od->l3redirect_port->json_key);
+                              l3dgw_port->redirect_port->json_key);
             }
 
             build_lrouter_arp_flow(op->od, op,
@@ -10855,9 +10990,9 @@ build_lrouter_ipv4_ip_input(struct ovn_port *op,
 
         SSET_FOR_EACH (ip_address, &all_ips_v6) {
             ds_clear(match);
-            if (op == op->od->l3dgw_port) {
+            if (l3dgw_port) {
                 ds_put_format(match, "is_chassis_resident(%s)",
-                              op->od->l3redirect_port->json_key);
+                              l3dgw_port->redirect_port->json_key);
             }
 
             build_lrouter_nd_flow(op->od, op, "nd_na",
@@ -10869,7 +11004,7 @@ build_lrouter_ipv4_ip_input(struct ovn_port *op,
         sset_destroy(&all_ips_v6);
 
         if (!smap_get(&op->od->nbr->options, "chassis")
-            && !op->od->l3dgw_port) {
+            && !op->od->n_l3dgw_ports) {
             /* UDP/TCP/SCTP port unreachable. */
             for (int i = 0; i < op->lrp_networks.n_ipv4_addrs; i++) {
                 ds_clear(match);
@@ -10946,7 +11081,7 @@ build_lrouter_ipv4_ip_input(struct ovn_port *op,
          * exception is on the l3dgw_port where we might need to use a
          * different ETH address.
          */
-        if (op != op->od->l3dgw_port) {
+        if (!l3dgw_port) {
             return;
         }
 
@@ -11011,7 +11146,7 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
         /* NAT rules are only valid on Gateway routers and routers with
          * l3dgw_port (router has a port with gateway chassis
          * specified). */
-        if (!smap_get(&od->nbr->options, "chassis") && !od->l3dgw_port) {
+        if (!smap_get(&od->nbr->options, "chassis") && !od->n_l3dgw_ports) {
             return;
         }
 
@@ -11027,8 +11162,9 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
 
             nat = od->nbr->nat[i];
 
-            ovs_be32 ip, mask;
+            ovs_be32 ip, mask, ip_external;
             struct in6_addr ipv6, mask_v6, v6_exact = IN6ADDR_EXACT_INIT;
+            struct in6_addr ip6_external;
             bool is_v6 = false;
             bool stateless = lrouter_nat_is_stateless(nat);
             struct nbrec_address_set *allowed_ext_ips =
@@ -11044,10 +11180,10 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
                 continue;
             }
 
-            char *error = ip_parse_masked(nat->external_ip, &ip, &mask);
+            char *error = ip_parse_masked(nat->external_ip, &ip_external, &mask);
             if (error || mask != OVS_BE32_MAX) {
                 free(error);
-                error = ipv6_parse_masked(nat->external_ip, &ipv6, &mask_v6);
+                error = ipv6_parse_masked(nat->external_ip, &ip6_external, &mask_v6);
                 if (error || memcmp(&mask_v6, &v6_exact, sizeof(mask_v6))) {
                     /* Invalid for both IPv4 and IPv6 */
                     static struct vlog_rate_limit rl =
@@ -11098,11 +11234,28 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
                 }
             }
 
+            struct ovn_l3dgw_port *l3dgw_port = NULL;
+            if (od->n_l3dgw_ports) {
+                /* Get the L3DGW port only for distributed router. */
+                if (!is_v6) {
+                    in6_addr_set_mapped_ipv4(&ip6_external, ip_external);
+                }
+                l3dgw_port = ovn_get_l3dgw_port_from_ip(od, ip6_external);
+                if (!l3dgw_port) {
+                    static struct vlog_rate_limit rl =
+                        VLOG_RATE_LIMIT_INIT(5, 1);
+                    VLOG_WARN_RL(&rl, "Could not map external ip: %s to a "
+                        "gateway port in router "UUID_FMT"",
+                        nat->external_ip, UUID_ARGS(&od->key));
+                    continue;
+                }
+            }
+
             /* For distributed router NAT, determine whether this NAT rule
              * satisfies the conditions for distributed NAT processing. */
             bool distributed = false;
             struct eth_addr mac;
-            if (od->l3dgw_port && !strcmp(nat->type, "dnat_and_snat") &&
+            if (l3dgw_port && !strcmp(nat->type, "dnat_and_snat") &&
                 nat->logical_port && nat->external_mac) {
                 if (eth_addr_from_string(nat->external_mac, &mac)) {
                     distributed = true;
@@ -11126,7 +11279,7 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
              * egress pipeline. */
             if (!strcmp(nat->type, "snat")
                 || !strcmp(nat->type, "dnat_and_snat")) {
-                if (!od->l3dgw_port) {
+                if (!l3dgw_port) {
                     /* Gateway router. */
                     ds_clear(match);
                     ds_clear(actions);
@@ -11154,12 +11307,12 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
                                           " && inport == %s",
                                   is_v6 ? "6" : "4",
                                   nat->external_ip,
-                                  od->l3dgw_port->json_key);
-                    if (!distributed && od->l3redirect_port) {
+                                  l3dgw_port->dgw_port->json_key);
+                    if (!distributed && od->n_l3dgw_ports) {
                         /* Flows for NAT rules that are centralized are only
                          * programmed on the gateway chassis. */
                         ds_put_format(match, " && is_chassis_resident(%s)",
-                                      od->l3redirect_port->json_key);
+                                      l3dgw_port->redirect_port->json_key);
                     }
 
                     if (!strcmp(nat->type, "dnat_and_snat") && stateless) {
@@ -11181,7 +11334,7 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
              * to a logical IP address. */
             if (!strcmp(nat->type, "dnat")
                 || !strcmp(nat->type, "dnat_and_snat")) {
-                if (!od->l3dgw_port) {
+                if (!l3dgw_port) {
                     /* Gateway router. */
                     /* Packet when it goes from the initiator to destination.
                      * We need to set flags.loopback because the router can
@@ -11231,12 +11384,12 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
                                           " && inport == %s",
                                   is_v6 ? "6" : "4",
                                   nat->external_ip,
-                                  od->l3dgw_port->json_key);
-                    if (!distributed && od->l3redirect_port) {
+                                  l3dgw_port->dgw_port->json_key);
+                    if (!distributed && l3dgw_port) {
                         /* Flows for NAT rules that are centralized are only
                          * programmed on the gateway chassis. */
                         ds_put_format(match, " && is_chassis_resident(%s)",
-                                      od->l3redirect_port->json_key);
+                                      l3dgw_port->redirect_port->json_key);
                     }
                     ds_clear(actions);
                     if (allowed_ext_ips || exempted_ext_ips) {
@@ -11263,12 +11416,12 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
             }
 
             /* ARP resolve for NAT IPs. */
-            if (od->l3dgw_port) {
+            if (l3dgw_port) {
                 if (!strcmp(nat->type, "snat")) {
                     ds_clear(match);
                     ds_put_format(
                         match, "inport == %s && %s == %s",
-                        od->l3dgw_port->json_key,
+                        l3dgw_port->dgw_port->json_key,
                         is_v6 ? "ip6.src" : "ip4.src", nat->external_ip);
                     ovn_lflow_add_with_hint(lflows, od, S_ROUTER_IN_IP_INPUT,
                                             120, ds_cstr(match), "next;",
@@ -11279,14 +11432,14 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
                     ds_clear(match);
                     ds_put_format(
                         match, "outport == %s && %s == %s",
-                        od->l3dgw_port->json_key,
+                        l3dgw_port->dgw_port->json_key,
                         is_v6 ? REG_NEXT_HOP_IPV6 : REG_NEXT_HOP_IPV4,
                         nat->external_ip);
                     ds_clear(actions);
                     ds_put_format(
                         actions, "eth.dst = %s; next;",
                         distributed ? nat->external_mac :
-                        od->l3dgw_port->lrp_networks.ea_s);
+                        l3dgw_port->dgw_port->lrp_networks.ea_s);
                     ovn_lflow_add_with_hint(lflows, od,
                                             S_ROUTER_IN_ARP_RESOLVE,
                                             100, ds_cstr(match),
@@ -11309,19 +11462,19 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
              * Note that this only applies for NAT on a distributed router.
              * Undo DNAT on a gateway router is done in the ingress DNAT
              * pipeline stage. */
-            if (od->l3dgw_port && (!strcmp(nat->type, "dnat")
+            if (l3dgw_port && (!strcmp(nat->type, "dnat")
                 || !strcmp(nat->type, "dnat_and_snat"))) {
                 ds_clear(match);
                 ds_put_format(match, "ip && ip%s.src == %s"
                                       " && outport == %s",
                               is_v6 ? "6" : "4",
                               nat->logical_ip,
-                              od->l3dgw_port->json_key);
-                if (!distributed && od->l3redirect_port) {
+                              l3dgw_port->dgw_port->json_key);
+                if (!distributed && od->n_l3dgw_ports) {
                     /* Flows for NAT rules that are centralized are only
                      * programmed on the gateway chassis. */
                     ds_put_format(match, " && is_chassis_resident(%s)",
-                                  od->l3redirect_port->json_key);
+                                  l3dgw_port->redirect_port->json_key);
                 }
                 ds_clear(actions);
                 if (distributed) {
@@ -11346,7 +11499,7 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
              * address. */
             if (!strcmp(nat->type, "snat")
                 || !strcmp(nat->type, "dnat_and_snat")) {
-                if (!od->l3dgw_port) {
+                if (!l3dgw_port) {
                     /* Gateway router. */
                     ds_clear(match);
                     ds_put_format(match, "ip && ip%s.src == %s",
@@ -11389,13 +11542,13 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
                                           " && outport == %s",
                                   is_v6 ? "6" : "4",
                                   nat->logical_ip,
-                                  od->l3dgw_port->json_key);
-                    if (!distributed && od->l3redirect_port) {
+                                  l3dgw_port->dgw_port->json_key);
+                    if (!distributed && od->n_l3dgw_ports) {
                         /* Flows for NAT rules that are centralized are only
                          * programmed on the gateway chassis. */
                         priority += 128;
                         ds_put_format(match, " && is_chassis_resident(%s)",
-                                      od->l3redirect_port->json_key);
+                                      l3dgw_port->redirect_port->json_key);
                     }
                     ds_clear(actions);
 
@@ -11444,14 +11597,14 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
                  */
                 ds_clear(actions);
                 ds_put_format(actions, REG_INPORT_ETH_ADDR " = %s; next;",
-                              od->l3dgw_port->lrp_networks.ea_s);
+                              l3dgw_port->dgw_port->lrp_networks.ea_s);
 
                 ds_clear(match);
                 ds_put_format(match,
                               "eth.dst == "ETH_ADDR_FMT" && inport == %s"
                               " && is_chassis_resident(\"%s\")",
                               ETH_ADDR_ARGS(mac),
-                              od->l3dgw_port->json_key,
+                              l3dgw_port->dgw_port->json_key,
                               nat->logical_port);
                 ovn_lflow_add_with_hint(lflows, od, S_ROUTER_IN_ADMISSION, 50,
                                         ds_cstr(match), ds_cstr(actions),
@@ -11474,7 +11627,8 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
                               "ip%s.src == %s && outport == %s && "
                               "is_chassis_resident(\"%s\")",
                               is_v6 ? "6" : "4", nat->logical_ip,
-                              od->l3dgw_port->json_key, nat->logical_port);
+                              l3dgw_port->dgw_port->json_key,
+                              nat->logical_port);
                 ds_put_format(actions, "eth.src = %s; %s = %s; next;",
                               nat->external_mac,
                               is_v6 ? REG_SRC_IPV6 : REG_SRC_IPV4,
@@ -11489,16 +11643,16 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
              * gateway port have ip.dst matching a NAT external IP, then
              * loop a clone of the packet back to the beginning of the
              * ingress pipeline with inport = outport. */
-            if (od->l3dgw_port) {
+            if (l3dgw_port) {
                 /* Distributed router. */
                 ds_clear(match);
                 ds_put_format(match, "ip%s.dst == %s && outport == %s",
                               is_v6 ? "6" : "4",
                               nat->external_ip,
-                              od->l3dgw_port->json_key);
+                              l3dgw_port->dgw_port->json_key);
                 if (!distributed) {
                     ds_put_format(match, " && is_chassis_resident(%s)",
-                                  od->l3redirect_port->json_key);
+                                  l3dgw_port->redirect_port->json_key);
                 } else {
                     ds_put_format(match, " && is_chassis_resident(\"%s\")",
                                   nat->logical_port);
@@ -11522,7 +11676,7 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
         }
 
         /* Handle force SNAT options set in the gateway router. */
-        if (!od->l3dgw_port) {
+        if (!od->n_l3dgw_ports) {
             if (dnat_force_snat_ip) {
                 if (od->dnat_force_snat_addrs.n_ipv4_addrs) {
                     build_lrouter_force_snat_flows(lflows, od, "4",
@@ -11561,7 +11715,7 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
 
         /* Load balancing and packet defrag are only valid on
          * Gateway routers or router with gateway port. */
-        if (!smap_get(&od->nbr->options, "chassis") && !od->l3dgw_port) {
+        if (!smap_get(&od->nbr->options, "chassis") && !od->n_l3dgw_ports) {
             sset_destroy(&nat_entries);
             return;
         }
@@ -11631,11 +11785,6 @@ build_lrouter_nat_defrag_and_lb(struct ovn_datapath *od,
                     prio = 120;
                 }
 
-                if (od->l3redirect_port &&
-                    (lb_vip->n_backends || !lb_vip->empty_backend_rej)) {
-                    ds_put_format(match, " && is_chassis_resident(%s)",
-                                  od->l3redirect_port->json_key);
-                }
                 add_router_lb_flow(lflows, od, match, actions, prio,
                                    lb_force_snat_ip, lb_vip, proto,
                                    nb_lb, meter_groups, &nat_entries);
diff --git a/ovn-nb.xml b/ovn-nb.xml
index b0a4adffe..6a6403023 100644
--- a/ovn-nb.xml
+++ b/ovn-nb.xml
@@ -2381,8 +2381,8 @@
           </p>
 
           <p>
-            OVN honors this option only if the logical router has a distributed
-            gateway port and if the LRP's peer switch has a
+            OVN honors this option only if the logical router has a single
+            distributed gateway port and if the LRP's peer switch has a
             <code>localnet</code> port.
           </p>
         </column>
diff --git a/tests/ovn-nbctl.at b/tests/ovn-nbctl.at
index 6d91aa4c5..86f55fae3 100644
--- a/tests/ovn-nbctl.at
+++ b/tests/ovn-nbctl.at
@@ -721,8 +721,44 @@ AT_CHECK([ovn-nbctl lr-nat-update-ext-ip lr0 snat 192.168.16 allowed_range], [1]
 [ovn-nbctl: 192.168.16: Invalid IP address or CIDR
 ])
 
-AT_CHECK([ovn-nbctl lr-nat-del lr0])])
+AT_CHECK([ovn-nbctl lr-nat-del lr0])
+AT_CHECK([ovn-nbctl lrp-add lr0 lrp0 00:00:00:01:02:03 192.168.1.1/24])
+AT_CHECK([ovn-nbctl lrp-add lr0 lrp1 00:00:00:01:02:04 172.64.1.1/24])
+AT_CHECK([ovn-nbctl lrp-set-gateway-chassis lrp0 chassis1])
+AT_CHECK([ovn-nbctl lrp-set-gateway-chassis lrp1 chassis2])
 
+AT_CHECK([ovn-nbctl lr-nat-add lr0 snat 192.168.1.10 20.0.0.10])
+AT_CHECK([ovn-nbctl lr-nat-add lr0 snat 172.64.1.10 20.0.0.10])
+AT_CHECK([ovn-nbctl lr-nat-add lr0 snat 192.168.1.20 20.0.0.10], [1], [],
+[ovn-nbctl: a NAT with this type (snat) and logical_ip (20.0.0.10) already exists
+])
+AT_CHECK([ovn-nbctl lr-nat-add lr0 dnat 172.64.1.20 20.0.0.20])
+AT_CHECK([ovn-nbctl lr-nat-add lr0 dnat 172.64.1.20 20.0.0.30], [1], [],
+[ovn-nbctl: a NAT with this type (dnat) and external_ip (172.64.1.20) already exists
+])
+AT_CHECK([ovn-nbctl lr-nat-list lr0], [0], [dnl
+TYPE             EXTERNAL_IP        EXTERNAL_PORT    LOGICAL_IP            EXTERNAL_MAC         LOGICAL_PORT
+dnat             172.64.1.20                         20.0.0.20
+snat             172.64.1.10                         20.0.0.10
+snat             192.168.1.10                        20.0.0.10
+])
+AT_CHECK([ovn-nbctl lr-nat-del lr0 snat 20.0.0.10 172.64.1.10])
+AT_CHECK([ovn-nbctl lr-nat-list lr0], [0], [dnl
+TYPE             EXTERNAL_IP        EXTERNAL_PORT    LOGICAL_IP            EXTERNAL_MAC         LOGICAL_PORT
+dnat             172.64.1.20                         20.0.0.20
+snat             192.168.1.10                        20.0.0.10
+])
+AT_CHECK([ovn-nbctl lr-nat-add lr0 snat 172.64.1.10 20.0.0.10])
+AT_CHECK([ovn-nbctl lr-nat-del lr0 snat 20.0.0.10])
+AT_CHECK([ovn-nbctl lr-nat-list lr0], [0], [dnl
+TYPE             EXTERNAL_IP        EXTERNAL_PORT    LOGICAL_IP            EXTERNAL_MAC         LOGICAL_PORT
+dnat             172.64.1.20                         20.0.0.20
+])
+AT_CHECK([ovn-nbctl lr-nat-del lr0 snat 20.0.0.10], [1], [],
+[ovn-nbctl: no matching NAT with the type (snat) and logical_ip (20.0.0.10)
+])
+AT_CHECK([ovn-nbctl lr-nat-del lr0])
+])
 dnl ---------------------------------------------------------------------
 
 OVN_NBCTL_TEST([ovn_nbctl_lbs], [LBs], [
diff --git a/tests/ovn-northd.at b/tests/ovn-northd.at
index f3f88fa12..4d79104bf 100644
--- a/tests/ovn-northd.at
+++ b/tests/ovn-northd.at
@@ -836,7 +836,7 @@ ovn_start
 ovn-sbctl chassis-add gw1 geneve 127.0.0.1
 
 ovn-nbctl lr-add R1
-ovn-nbctl lrp-add R1 R1-S1 02:ac:10:01:00:01 172.16.1.1/24
+ovn-nbctl lrp-add R1 R1-S1 02:ac:10:01:00:01 172.16.1.1/24 3000::a/64
 
 ovn-nbctl ls-add S1
 ovn-nbctl lsp-add S1 S1-R1
@@ -877,13 +877,13 @@ ovn-nbctl lr-nat-del R1 dnat_and_snat  172.16.1.1
 
 echo
 echo "IPv6: stateful"
-ovn-nbctl --wait=sb lr-nat-add R1 dnat_and_snat fd01::1 fd11::2
+ovn-nbctl --wait=sb lr-nat-add R1 dnat_and_snat 3000::c 1000::3
 check_flow_match_sets 2 2 2 0 0 0 0
-ovn-nbctl lr-nat-del R1 dnat_and_snat  fd01::1
+ovn-nbctl lr-nat-del R1 dnat_and_snat  3000::c
 
 echo
 echo "IPv6: stateless"
-ovn-nbctl --wait=sb --stateless lr-nat-add R1 dnat_and_snat fd01::1 fd11::2
+ovn-nbctl --wait=sb --stateless lr-nat-add R1 dnat_and_snat 3000::c 1000::3
 check_flow_match_sets 2 0 0 0 0 2 2
 
 AT_CLEANUP
@@ -896,7 +896,7 @@ ovn_start
 ovn-sbctl chassis-add gw1 geneve 127.0.0.1
 
 ovn-nbctl lr-add R1
-ovn-nbctl lrp-add R1 R1-S1 02:ac:10:01:00:01 172.16.1.1/24
+ovn-nbctl lrp-add R1 R1-S1 02:ac:10:01:00:01 172.16.1.1/24 3000::a/64
 
 ovn-nbctl ls-add S1
 ovn-nbctl lsp-add S1 S1-R1
@@ -1399,6 +1399,117 @@ OVS_WAIT_FOR_OUTPUT(
 AT_CLEANUP
 ])
 
+AT_SETUP([ovn -- check Load balancer health check and Service Monitor sync for NAT])
+ovn_start
+
+ovn-nbctl lr-add lr0
+ovn-nbctl lrp-add lr0 lr0-public 00:00:01:01:02:04 192.168.2.1/24
+ovn-nbctl lrp-set-gateway-chassis lr0-public chassis1
+ovn-nbctl ls-add sw0
+ovn-nbctl ls-add sw1
+ovn-nbctl lrp-add lr0 lr0-sw0 00:00:00:00:00:05 10.0.0.1/24
+ovn-nbctl lrp-add lr0 lr0-sw1 02:00:00:00:00:05 20.0.0.1/24
+ovn-nbctl lsp-add sw0 sw0-lr0 -- set Logical_Switch_Port sw0-lr0 type=router options:router-port=lr0-sw0 -- lsp-set-addresses sw0-lr0 router
+ovn-nbctl lsp-add sw1 sw1-lr0 -- set Logical_Switch_Port sw1-lr0 type=router options:router-port=lr0-sw1 -- lsp-set-addresses sw1-lr0 router
+ovn-nbctl lr-nat-add lr0 snat 192.168.2.1 10.0.0.0/24
+
+ovn-nbctl --reject lb-add lb1 192.168.2.1:80 10.0.0.3:80,20.0.0.3:80
+
+AT_CHECK([ovn-nbctl --wait=sb -- --id=@hc create \
+Load_Balancer_Health_Check vip="192.168.2.1\:80" -- add Load_Balancer . \
+health_check @hc | uuidfilt], [0], [<0>
+])
+
+wait_row_count Service_Monitor 0
+
+ovn-nbctl --wait=sb lsp-add sw0 sw0-p1 -- lsp-set-addresses sw0-p1 \
+"00:00:00:00:00:03 10.0.0.3"
+ovn-nbctl --wait=sb lsp-add sw1 sw1-p1 -- lsp-set-addresses sw1-p1 \
+"02:00:00:00:00:03 20.0.0.3"
+
+ovn-nbctl --wait=sb set load_balancer . ip_port_mappings:10.0.0.3=sw0-p1:10.0.0.2
+wait_row_count Service_Monitor 1
+
+ovn-nbctl --wait=sb set load_balancer . ip_port_mappings:20.0.0.3=sw1-p1:20.0.0.2
+wait_row_count Service_Monitor 2
+
+check ovn-nbctl --wait=sb lr-lb-add lr0 lb1
+
+AT_CAPTURE_FILE([sbflows])
+OVS_WAIT_FOR_OUTPUT(
+  [ovn-sbctl dump-flows lr0 | tee sbflows | grep 'priority=120.*ct_lb' | sed 's/table=..//'], 0, [dnl
+  (lr_in_dnat         ), priority=120  , match=(ct.new && ip && ip4.dst == 192.168.2.1 && tcp && tcp.dst == 80 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(ct_lb(backends=10.0.0.3:80,20.0.0.3:80);)
+])
+
+# Get the uuid of both the service_monitor
+sm_sw0_p1=$(fetch_column Service_Monitor _uuid logical_port=sw0-p1)
+sm_sw1_p1=$(fetch_column Service_Monitor _uuid logical_port=sw1-p1)
+
+# Set the service monitor for sw1-p1 to offline
+check ovn-sbctl set service_monitor sw1-p1 status=offline
+wait_row_count Service_Monitor 1 logical_port=sw1-p1 status=offline
+
+AT_CAPTURE_FILE([sbflows2])
+OVS_WAIT_FOR_OUTPUT(
+  [ovn-sbctl dump-flows lr0 | tee sbflows2 | grep 'priority=120.*ct_lb' | sed 's/table=..//'], 0, [dnl
+  (lr_in_dnat         ), priority=120  , match=(ct.new && ip && ip4.dst == 192.168.2.1 && tcp && tcp.dst == 80 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(ct_lb(backends=10.0.0.3:80);)
+])
+
+# Set the service monitor for sw0-p1 to offline
+ovn-sbctl set service_monitor $sm_sw0_p1 status=offline
+
+wait_row_count Service_Monitor 1 logical_port=sw0-p1 status=offline
+
+AT_CAPTURE_FILE([sbflows3])
+OVS_WAIT_FOR_OUTPUT(
+  [ovn-sbctl dump-flows lr0 | tee sbflows3 | grep 'ct.new && ip && ip4.dst == 192.168.2.1' | grep 'priority=120' | sed 's/table=..//'], [0], [dnl
+  (lr_in_dnat         ), priority=120  , match=(ct.new && ip && ip4.dst == 192.168.2.1 && tcp && tcp.dst == 80 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(reg0 = 0; reject { outport <-> inport; next(pipeline=egress,table=1);};)
+])
+
+# Set the service monitor for sw0-p1 and sw1-p1 to online
+ovn-sbctl set service_monitor $sm_sw0_p1 status=online
+ovn-sbctl set service_monitor $sm_sw1_p1 status=online
+
+wait_row_count Service_Monitor 1 logical_port=sw1-p1 status=online
+
+# Add another distributed gateway port
+ovn-nbctl lrp-add lr0 lr0-public1 00:00:01:01:02:06 172.64.1.1/24
+ovn-nbctl lrp-set-gateway-chassis lr0-public1 chassis2
+
+AT_CAPTURE_FILE([sbflows4])
+OVS_WAIT_FOR_OUTPUT(
+  [ovn-sbctl dump-flows lr0 | tee sbflows4 | grep 'priority=120.*ct_lb' | sed 's/table=..//'], 0, [dnl
+  (lr_in_dnat         ), priority=120  , match=(ct.new && ip && ip4.dst == 192.168.2.1 && tcp && tcp.dst == 80 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(ct_lb(backends=10.0.0.3:80,20.0.0.3:80);)
+  (lr_in_dnat         ), priority=120  , match=(ct.new && ip && ip4.dst == 192.168.2.1 && tcp && tcp.dst == 80 && inport == "lr0-public1" && is_chassis_resident("cr-lr0-public1")), action=(ct_lb(backends=10.0.0.3:80,20.0.0.3:80);)
+])
+
+# Set the service monitors offline
+ovn-sbctl set service_monitor $sm_sw0_p1 status=offline
+ovn-sbctl set service_monitor $sm_sw1_p1 status=offline
+
+AT_CAPTURE_FILE([sbflows5])
+OVS_WAIT_FOR_OUTPUT(
+  [ovn-sbctl dump-flows lr0 | tee sbflows5 | grep 'ct.new && ip && ip4.dst == 192.168.2.1' | grep 'priority=120' | sed 's/table=..//'], [0], [dnl
+  (lr_in_dnat         ), priority=120  , match=(ct.new && ip && ip4.dst == 192.168.2.1 && tcp && tcp.dst == 80 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(reg0 = 0; reject { outport <-> inport; next(pipeline=egress,table=1);};)
+  (lr_in_dnat         ), priority=120  , match=(ct.new && ip && ip4.dst == 192.168.2.1 && tcp && tcp.dst == 80 && inport == "lr0-public1" && is_chassis_resident("cr-lr0-public1")), action=(reg0 = 0; reject { outport <-> inport; next(pipeline=egress,table=1);};)
+])
+
+# Set reject=false on lb1
+ovn-nbctl set Load_Balancer lb1 options:reject=false
+
+AT_CAPTURE_FILE([sbflows6])
+OVS_WAIT_FOR_OUTPUT(
+  [ovn-sbctl dump-flows lr0 | tee sbflows6 | grep 'priority=120.*ct_lb'], 1)
+
+AT_CAPTURE_FILE([sbflows7])
+OVS_WAIT_FOR_OUTPUT(
+  [ovn-sbctl dump-flows lr0 | tee sbflows7 | grep 'ct.new && ip && ip4.dst == 192.168.2.1' | grep priority=120 | sed 's/table=..//'], [0], [dnl
+  (lr_in_dnat         ), priority=120  , match=(ct.new && ip && ip4.dst == 192.168.2.1 && tcp && tcp.dst == 80 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(drop;)
+  (lr_in_dnat         ), priority=120  , match=(ct.new && ip && ip4.dst == 192.168.2.1 && tcp && tcp.dst == 80 && inport == "lr0-public1" && is_chassis_resident("cr-lr0-public1")), action=(drop;)
+])
+
+AT_CLEANUP
+
 OVN_FOR_EACH_NORTHD([
 AT_SETUP([ovn -- Load balancer VIP in NAT entries])
 AT_SKIP_IF([test $HAVE_PYTHON = no])
@@ -2674,6 +2785,348 @@ check ovn-nbctl ls-add ls \
 check ovn-nbctl --wait=sb sync
 
 AT_CHECK([grep -qE 'duplicate logical.*port p1' northd/ovn-northd.log], [0])
+AT_CLEANUP
+
+AT_SETUP([ovn-northd -- lr multiple gw ports])
+ovn_start
+
+# Logical network:
+# 1 LR, 3 Logical Switches,
+# 1 gateway chassis attached to each corresponding LRP.
+#
+#                | S1 (gw1)
+#                |
+#      ls  ----  DR -- S3 (gw3)
+# (20.0.0.0/24)  |
+#                | S2 (gw2)
+#
+# We will validate basic LR logical flows.
+
+ovn-sbctl chassis-add gw1 geneve 127.0.0.1
+ovn-sbctl chassis-add gw2 geneve 128.0.0.1
+ovn-sbctl chassis-add gw3 geneve 129.0.0.1
+
+ovn-nbctl lr-add DR
+ovn-nbctl lrp-add DR DR-S1 02:ac:10:01:00:01 172.16.1.1/24
+ovn-nbctl lrp-add DR DR-S2 03:ac:10:01:00:01 10.0.0.0/24
+ovn-nbctl lrp-add DR DR-S3 04:ac:10:01:00:01 192.168.0.0/24
+ovn-nbctl lrp-add DR DR-ls 04:ac:10:01:00:01 20.0.0.0/24
+
+ovn-nbctl ls-add S1
+ovn-nbctl lsp-add S1 S1-DR
+ovn-nbctl lsp-set-type S1-DR router
+ovn-nbctl lsp-set-addresses S1-DR router
+ovn-nbctl --wait=sb lsp-set-options S1-DR router-port=DR-S1
+
+ovn-nbctl ls-add S2
+ovn-nbctl lsp-add S2 S2-DR
+ovn-nbctl lsp-set-type S2-DR router
+ovn-nbctl lsp-set-addresses S2-DR router
+ovn-nbctl --wait=sb lsp-set-options S2-DR router-port=DR-S2
+
+ovn-nbctl ls-add S3
+ovn-nbctl lsp-add S3 S3-DR
+ovn-nbctl lsp-set-type S3-DR router
+ovn-nbctl lsp-set-addresses S3-DR router
+ovn-nbctl --wait=sb lsp-set-options S3-DR router-port=DR-S3
+
+ovn-nbctl ls-add  ls
+ovn-nbctl lsp-add ls ls-DR
+ovn-nbctl lsp-set-type ls-DR router
+ovn-nbctl lsp-set-addresses ls-DR router
+ovn-nbctl --wait=sb lsp-set-options ls-DR router-port=DR-ls
+
+ovn-nbctl lrp-set-gateway-chassis DR-S1 gw1
+ovn-nbctl lrp-set-gateway-chassis DR-S2 gw2
+ovn-nbctl lrp-set-gateway-chassis DR-S3 gw3
+
+ovn-nbctl --wait=sb sync
+
+ovn-sbctl dump-flows DR
+
+# Check the flows in lr_in_lookup_neighbor stage
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_lookup_neighbor | grep cr-DR | wc -l], [0], [3
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_lookup_neighbor | grep cr-DR-S1 | wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_lookup_neighbor | grep cr-DR-S2 | wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_lookup_neighbor | grep cr-DR-S3 | wc -l], [0], [1
+])
+
+# Check the flows in lr_in_gw_redirect stage
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_gw_redirect | grep cr-DR | wc -l], [0], [3
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_gw_redirect | grep cr-DR-S1 | wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_gw_redirect | grep cr-DR-S2 | wc -l], [0], [1
+])
+AT_CLEANUP
+
+AT_SETUP([ovn-northd -- lr multiple gw ports NAT])
+ovn_start
+
+# Logical network:
+# 1 LR, 3 Logical Switches,
+# 1 gateway chassis attached to each corresponding LRP.
+#
+#                | S1 (gw1)
+#                |
+#      ls  ----  DR -- S3 (gw3)
+# (20.0.0.0/24)  |
+#                | S2 (gw2)
+#
+# We will validate basic SNAT, DNAT and DNAT_AND_SNAT with
+# multiple distributed gateway LRPs.
+ovn-sbctl chassis-add gw1 geneve 127.0.0.1
+ovn-sbctl chassis-add gw2 geneve 128.0.0.1
+ovn-sbctl chassis-add gw3 geneve 129.0.0.1
+
+ovn-nbctl lr-add DR
+ovn-nbctl lrp-add DR DR-S1 02:ac:10:01:00:01 172.16.1.1/24
+ovn-nbctl lrp-add DR DR-S2 03:ac:10:01:00:01 10.0.0.1/24
+ovn-nbctl lrp-add DR DR-S3 04:ac:10:01:00:01 192.168.0.1/24
+ovn-nbctl lrp-add DR DR-ls 05:ac:10:01:00:01 20.0.0.0/24
+
+ovn-nbctl ls-add S1
+ovn-nbctl lsp-add S1 S1-DR
+ovn-nbctl lsp-set-type S1-DR router
+ovn-nbctl lsp-set-addresses S1-DR router
+ovn-nbctl --wait=sb lsp-set-options S1-DR router-port=DR-S1
+
+ovn-nbctl ls-add S2
+ovn-nbctl lsp-add S2 S2-DR
+ovn-nbctl lsp-set-type S2-DR router
+ovn-nbctl lsp-set-addresses S2-DR router
+ovn-nbctl --wait=sb lsp-set-options S2-DR router-port=DR-S2
+
+ovn-nbctl ls-add S3
+ovn-nbctl lsp-add S3 S3-DR
+ovn-nbctl lsp-set-type S3-DR router
+ovn-nbctl lsp-set-addresses S3-DR router
+ovn-nbctl --wait=sb lsp-set-options S3-DR router-port=DR-S3
+
+ovn-nbctl ls-add  ls
+ovn-nbctl lsp-add ls ls-DR
+ovn-nbctl lsp-set-type ls-DR router
+ovn-nbctl lsp-set-addresses ls-DR router
+ovn-nbctl --wait=sb lsp-set-options ls-DR router-port=DR-ls
+
+ovn-nbctl lrp-set-gateway-chassis DR-S1 gw1
+ovn-nbctl lrp-set-gateway-chassis DR-S2 gw2
+ovn-nbctl lrp-set-gateway-chassis DR-S3 gw3
+
+ovn-nbctl --wait=sb sync
+
+# Configure SNAT
+ovn-nbctl lr-nat-add DR snat  172.16.1.1  20.0.0.10
+ovn-nbctl lr-nat-add DR snat  10.0.0.1    20.0.0.10
+ovn-nbctl lr-nat-add DR snat  192.168.0.1 20.0.0.10
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_unsnat | grep ct_snat| wc -l], [0], [3
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_snat | grep ct_snat| wc -l], [0], [3
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_unsnat | grep "ip4.dst == 172.16.1.1" | grep  cr-DR-S1 | grep ct_snat | wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_snat | grep "ip4.src == 20.0.0.10" | grep cr-DR-S1 | grep "ct_snat(172.16.1.1)"| wc -l], [0], [1
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_unsnat | grep "ip4.dst == 10.0.0.1" | grep  cr-DR-S2 | grep ct_snat | wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_snat | grep "ip4.src == 20.0.0.10" | grep cr-DR-S2 | grep "ct_snat(10.0.0.1)"| wc -l], [0], [1
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_unsnat | grep "ip4.dst == 192.168.0.1" | grep  cr-DR-S3 | grep ct_snat | wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_snat | grep "ip4.src == 20.0.0.10" | grep cr-DR-S3 | grep "ct_snat(192.168.0.1)"| wc -l], [0], [1
+])
+
+ovn-nbctl lr-nat-del DR snat  20.0.0.10
+ovn-nbctl lr-nat-del DR snat  20.0.0.10
+ovn-nbctl lr-nat-del DR snat  20.0.0.10
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_unsnat | grep ct_snat| wc -l], [0], [0
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_snat | grep ct_snat| wc -l], [0], [0
+])
+
+# Configure DNAT
+ovn-nbctl lr-nat-add DR dnat  172.16.1.10  20.0.0.10
+ovn-nbctl lr-nat-add DR dnat  10.0.0.10    20.0.0.10
+ovn-nbctl lr-nat-add DR dnat  192.168.0.10 20.0.0.10
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep ct_dnat| wc -l], [0], [3
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_undnat | grep ct_dnat| wc -l], [0], [3
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep "ip4.dst == 172.16.1.10" | grep  cr-DR-S1 | grep "ct_dnat(20.0.0.10)" | wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_undnat | grep "ip4.src == 20.0.0.10" | grep cr-DR-S1 | grep ct_dnat | wc -l], [0], [1
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep "ip4.dst == 10.0.0.10" | grep  cr-DR-S2 | grep "ct_dnat(20.0.0.10)" | wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_undnat | grep "ip4.src == 20.0.0.10" | grep cr-DR-S2 | grep ct_dnat | wc -l], [0], [1
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep "ip4.dst == 192.168.0.10" | grep  cr-DR-S3 | grep "ct_dnat(20.0.0.10)" | wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_undnat | grep "ip4.src == 20.0.0.10" | grep cr-DR-S3 | grep ct_dnat | wc -l], [0], [1
+])
+
+ovn-nbctl lr-nat-del DR dnat  172.16.1.10
+ovn-nbctl lr-nat-del DR dnat  10.0.0.10
+ovn-nbctl lr-nat-del DR dnat  192.168.0.10
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep ct_dnat | wc -l], [0], [0
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_undnat | grep ct_dnat | wc -l], [0], [0
+])
+
+# Configure DNAT_AND_SNAT
+ovn-nbctl lr-nat-add DR dnat_and_snat  172.16.1.10    20.0.0.10
+ovn-nbctl lr-nat-add DR dnat_and_snat  10.0.0.10      20.0.0.10
+ovn-nbctl lr-nat-add DR dnat_and_snat  192.168.0.10   20.0.0.10
+
+ovn-sbctl dump-flows DR
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_unsnat | grep ct_snat| wc -l], [0], [3
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_snat | grep ct_snat| wc -l], [0], [3
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_unsnat | grep "ip4.dst == 172.16.1.10" | grep  cr-DR-S1 | grep ct_snat | wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_snat | grep "ip4.src == 20.0.0.10" | grep cr-DR-S1 | grep "ct_snat(172.16.1.10)"| wc -l], [0], [1
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_unsnat | grep "ip4.dst == 10.0.0.10" | grep  cr-DR-S2 | grep ct_snat | wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_snat | grep "ip4.src == 20.0.0.10" | grep cr-DR-S2 | grep "ct_snat(10.0.0.10)"| wc -l], [0], [1
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_unsnat | grep "ip4.dst == 192.168.0.10" | grep  cr-DR-S3 | grep ct_snat | wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_snat | grep "ip4.src == 20.0.0.10" | grep cr-DR-S3 | grep "ct_snat(192.168.0.10)"| wc -l], [0], [1
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep ct_dnat| wc -l], [0], [3
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_undnat | grep ct_dnat| wc -l], [0], [3
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep "ip4.dst == 172.16.1.10" | grep  cr-DR-S1 | grep "ct_dnat(20.0.0.10)" | wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_undnat | grep "ip4.src == 20.0.0.10" | grep cr-DR-S1 | grep ct_dnat | wc -l], [0], [1
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep "ip4.dst == 10.0.0.10" | grep  cr-DR-S2 | grep "ct_dnat(20.0.0.10)" | wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_undnat | grep "ip4.src == 20.0.0.10" | grep cr-DR-S2 | grep ct_dnat | wc -l], [0], [1
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep "ip4.dst == 192.168.0.10" | grep  cr-DR-S3 | grep "ct_dnat(20.0.0.10)" | wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_undnat | grep "ip4.src == 20.0.0.10" | grep cr-DR-S3 | grep ct_dnat | wc -l], [0], [1
+])
+
+ovn-nbctl lr-nat-del DR dnat_and_snat  172.16.1.10
+ovn-nbctl lr-nat-del DR dnat_and_snat  10.0.0.10
+ovn-nbctl lr-nat-del DR dnat_and_snat  192.168.0.10
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_unsnat | grep ct_snat| wc -l], [0], [0
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_snat | grep ct_snat| wc -l], [0], [0
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep ct_dnat | wc -l], [0], [0
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_undnat | grep ct_dnat | wc -l], [0], [0
+])
+AT_CLEANUP
+
+AT_SETUP([ovn-northd -- lr multiple gw ports LB])
+ovn_start
+
+# Logical network:
+# 1 LR, 3 Logical Switches,
+# 1 gateway chassis attached to each corresponding LRP.
+#
+#                | S1 (gw1)
+#                |
+#      ls  ----  DR -- S3 (gw3)
+# (20.0.0.0/24)  |
+#                | S2 (gw2)
+#
+# We will validate LB with multiple distributed gateway LRPs.
+ovn-sbctl chassis-add gw1 geneve 127.0.0.1
+ovn-sbctl chassis-add gw2 geneve 128.0.0.1
+ovn-sbctl chassis-add gw3 geneve 129.0.0.1
+
+ovn-nbctl lr-add DR
+ovn-nbctl lrp-add DR DR-S1 02:ac:10:01:00:01 172.16.1.1/24
+ovn-nbctl lrp-add DR DR-S2 03:ac:10:01:00:01 10.0.0.1/24
+ovn-nbctl lrp-add DR DR-S3 04:ac:10:01:00:01 192.168.0.1/24
+ovn-nbctl lrp-add DR DR-ls 05:ac:10:01:00:01 20.0.0.0/24
+
+ovn-nbctl ls-add S1
+ovn-nbctl lsp-add S1 S1-DR
+ovn-nbctl lsp-set-type S1-DR router
+ovn-nbctl lsp-set-addresses S1-DR router
+ovn-nbctl --wait=sb lsp-set-options S1-DR router-port=DR-S1
+
+ovn-nbctl ls-add S2
+ovn-nbctl lsp-add S2 S2-DR
+ovn-nbctl lsp-set-type S2-DR router
+ovn-nbctl lsp-set-addresses S2-DR router
+ovn-nbctl --wait=sb lsp-set-options S2-DR router-port=DR-S2
+
+ovn-nbctl ls-add S3
+ovn-nbctl lsp-add S3 S3-DR
+ovn-nbctl lsp-set-type S3-DR router
+ovn-nbctl lsp-set-addresses S3-DR router
+ovn-nbctl --wait=sb lsp-set-options S3-DR router-port=DR-S3
+
+ovn-nbctl ls-add  ls
+ovn-nbctl lsp-add ls ls-DR
+ovn-nbctl lsp-set-type ls-DR router
+ovn-nbctl lsp-set-addresses ls-DR router
+ovn-nbctl --wait=sb lsp-set-options ls-DR router-port=DR-ls
+
+ovn-nbctl lrp-set-gateway-chassis DR-S1 gw1
+ovn-nbctl lrp-set-gateway-chassis DR-S2 gw2
+ovn-nbctl lrp-set-gateway-chassis DR-S3 gw3
+
+ovn-nbctl --wait=sb sync
+
+ovn-nbctl lb-add lb0 192.168.0.3:80 10.0.0.2:80,10.0.0.3:80
+ovn-nbctl lr-lb-add DR lb0
+
+ovn-sbctl dump-flows DR
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep ct.est| wc -l], [0], [3
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep ct.new| wc -l], [0], [3
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep ct.est| grep DR-S1 | grep cr-DR-S1| wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep ct.new| grep DR-S1| grep cr-DR-S1 | wc -l], [0], [1
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep ct.est| grep DR-S2 | grep cr-DR-S2| wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep ct.new| grep DR-S2| grep cr-DR-S2 | wc -l], [0], [1
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep ct.est| grep DR-S3 | grep cr-DR-S3| wc -l], [0], [1
+])
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_in_dnat | grep ct.new| grep DR-S3| grep cr-DR-S3 | wc -l], [0], [1
+])
+
+AT_CHECK([ovn-sbctl dump-flows DR | grep lr_out_undnat | grep priority=120| wc -l], [0], [3
+])
 
 AT_CLEANUP
 
@@ -2878,4 +3331,4 @@ wait_row_count FDB 0
 ovn-sbctl list FDB
 
 AT_CLEANUP
-])
\ No newline at end of file
+])
diff --git a/tests/ovn.at b/tests/ovn.at
index bec593dcc..4e1c0fc43 100644
--- a/tests/ovn.at
+++ b/tests/ovn.at
@@ -19943,7 +19943,7 @@ AT_CAPTURE_FILE([sbflows2])
 OVS_WAIT_FOR_OUTPUT(
   [ovn-sbctl dump-flows > sbflows2
    ovn-sbctl dump-flows lr0 | grep ct_lb | grep priority=120 | sed 's/table=..//'], 0,
-  [  (lr_in_dnat         ), priority=120  , match=(ct.new && ip && ip4.dst == 10.0.0.10 && tcp && tcp.dst == 80 && is_chassis_resident("cr-lr0-public")), action=(ct_lb(backends=10.0.0.3:80,20.0.0.3:80; hash_fields="ip_dst,ip_src,tcp_dst,tcp_src");)
+  [  (lr_in_dnat         ), priority=120  , match=(ct.new && ip && ip4.dst == 10.0.0.10 && tcp && tcp.dst == 80 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(ct_lb(backends=10.0.0.3:80,20.0.0.3:80; hash_fields="ip_dst,ip_src,tcp_dst,tcp_src");)
 ])
 
 # get the svc monitor mac.
@@ -19984,8 +19984,8 @@ AT_CHECK(
 AT_CAPTURE_FILE([sbflows4])
 ovn-sbctl dump-flows lr0 > sbflows4
 AT_CHECK([grep lr_in_dnat sbflows4 | grep priority=120 | sed 's/table=..//' | sort], [0], [dnl
-  (lr_in_dnat         ), priority=120  , match=(ct.est && ip && ip4.dst == 10.0.0.10 && tcp && tcp.dst == 80 && is_chassis_resident("cr-lr0-public")), action=(ct_dnat;)
-  (lr_in_dnat         ), priority=120  , match=(ct.new && ip && ip4.dst == 10.0.0.10 && tcp && tcp.dst == 80 && is_chassis_resident("cr-lr0-public")), action=(drop;)
+  (lr_in_dnat         ), priority=120  , match=(ct.est && ip && ip4.dst == 10.0.0.10 && tcp && tcp.dst == 80 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(ct_dnat;)
+  (lr_in_dnat         ), priority=120  , match=(ct.new && ip && ip4.dst == 10.0.0.10 && tcp && tcp.dst == 80 && inport == "lr0-public" && is_chassis_resident("cr-lr0-public")), action=(drop;)
 ])
 
 # Delete sw0-p1
@@ -25149,3 +25149,307 @@ AT_CHECK([cat hv2_offlows_table72.txt | grep -v NXST], [1], [dnl
 OVN_CLEANUP([hv1], [hv2])
 AT_CLEANUP
 ])
+
+AT_SETUP([ovn -- lr multiple gw ports])
+ovn_start
+
+# Logical network:
+# 1 LR, 3 Logical Switches,
+# 1 gateway chassis attached to each corresponding LRP.
+#
+#                | S1 (gw1)
+#                |
+#      ls  ----  DR -- S3 (gw3)
+# (20.0.0.0/24)  |
+#                | S2 (gw2)
+#
+# S1 - VLAN 1000
+# S2 - VLAN 2000
+# S3 - VLAN 3000
+#
+# 5 chassis(s), HV1----HV5
+#
+# HV1 - VIF11
+# HV2 - Gateway chassis gw1
+# HV3 - Gateway chassis gw2
+# HV4 - Gateway chassis gw3
+# HV5 - North endpoint
+
+ovn-nbctl lr-add DR
+ovn-nbctl lrp-add DR DR-S1 02:ac:10:01:00:01 172.16.1.1/24
+ovn-nbctl lrp-add DR DR-S2 08:ac:10:01:00:01 10.0.0.1/24
+ovn-nbctl lrp-add DR DR-S3 04:ac:10:01:00:01 192.168.0.1/24
+ovn-nbctl lrp-add DR DR-ls 06:ac:10:01:00:01 20.0.0.0/24
+
+ovn-nbctl ls-add S1
+ovn-nbctl lsp-add S1 S1-DR
+ovn-nbctl lsp-set-type S1-DR router
+ovn-nbctl lsp-set-addresses S1-DR router
+ovn-nbctl --wait=sb lsp-set-options S1-DR router-port=DR-S1
+ovn-nbctl lsp-add S1 ln1 "" 1000
+ovn-nbctl lsp-set-addresses ln1 unknown
+ovn-nbctl lsp-set-type ln1 localnet
+ovn-nbctl lsp-set-options ln1 network_name=phys
+
+ovn-nbctl ls-add S2
+ovn-nbctl lsp-add S2 S2-DR
+ovn-nbctl lsp-set-type S2-DR router
+ovn-nbctl lsp-set-addresses S2-DR router
+ovn-nbctl --wait=sb lsp-set-options S2-DR router-port=DR-S2
+ovn-nbctl lsp-add S2 ln2 "" 2000
+ovn-nbctl lsp-set-addresses ln2 unknown
+ovn-nbctl lsp-set-type ln2 localnet
+ovn-nbctl lsp-set-options ln2 network_name=phys
+
+ovn-nbctl ls-add S3
+ovn-nbctl lsp-add S3 S3-DR
+ovn-nbctl lsp-set-type S3-DR router
+ovn-nbctl lsp-set-addresses S3-DR router
+ovn-nbctl --wait=sb lsp-set-options S3-DR router-port=DR-S3
+ovn-nbctl lsp-add S3 ln3 "" 3000
+ovn-nbctl lsp-set-addresses ln3 unknown
+ovn-nbctl lsp-set-type ln3 localnet
+ovn-nbctl lsp-set-options ln3 network_name=phys
+
+ovn-nbctl ls-add  ls
+ovn-nbctl lsp-add ls ls-DR
+ovn-nbctl lsp-set-type ls-DR router
+ovn-nbctl lsp-set-addresses ls-DR router
+ovn-nbctl --wait=sb lsp-set-options ls-DR router-port=DR-ls
+
+# Add the lsp lp11 to ls. This will map to VIF11.
+ovn-nbctl lsp-add ls lp11
+ovn-nbctl lsp-set-addresses lp11 "f0:00:00:00:00:10 20.0.0.10"
+ovn-nbctl lsp-set-port-security lp11 f0:00:00:00:00:10
+
+# Add the Northbound endpoint, lp-north1
+ovn-nbctl ls-add ls-north1
+ovn-nbctl lsp-add ls-north1 ln4 "" 1000
+ovn-nbctl lsp-set-addresses ln4 unknown
+ovn-nbctl lsp-set-type ln4 localnet
+ovn-nbctl lsp-set-options ln4 network_name=phys
+
+ovn-nbctl lsp-add ls-north1 lp-north1
+ovn-nbctl lsp-set-addresses lp-north1 "f0:f0:00:00:00:11 172.16.1.10"
+ovn-nbctl lsp-set-port-security lp-north1 f0:f0:00:00:00:11
+
+# Add the Northbound endpoint, lp-north2
+ovn-nbctl ls-add ls-north2
+ovn-nbctl lsp-add ls-north2 ln5 "" 2000
+ovn-nbctl lsp-set-addresses ln5 unknown
+ovn-nbctl lsp-set-type ln5 localnet
+ovn-nbctl lsp-set-options ln5 network_name=phys
+
+ovn-nbctl lsp-add ls-north2 lp-north2
+ovn-nbctl lsp-set-addresses lp-north2 "f0:f0:00:00:00:22 10.0.0.10"
+ovn-nbctl lsp-set-port-security lp-north2 f0:f0:00:00:00:22
+
+# Add the Northbound endpoint, lp-north3
+ovn-nbctl ls-add ls-north3
+ovn-nbctl lsp-add ls-north3 ln6 "" 3000
+ovn-nbctl lsp-set-addresses ln6 unknown
+ovn-nbctl lsp-set-type ln6 localnet
+ovn-nbctl lsp-set-options ln6 network_name=phys
+
+ovn-nbctl lsp-add ls-north3 lp-north3
+ovn-nbctl lsp-set-addresses lp-north3 "f0:f0:00:00:00:33 192.168.0.10"
+ovn-nbctl lsp-set-port-security lp-north3 f0:f0:00:00:00:33
+
+# Add 5 chassis
+net_add n1
+for i in 1 2 3 4 5; do
+    sim_add hv$i
+    as hv$i
+    ovs-vsctl add-br br-phys
+    ovs-vsctl set open . external-ids:ovn-bridge-mappings=phys:br-phys
+    ovn_attach n1 br-phys 192.168.0.$i 24 $encap
+done
+
+# Add a vif on HV1
+as hv1 ovs-vsctl add-port br-int vif11 -- \
+    set Interface vif11 external-ids:iface-id=lp11 \
+                              options:tx_pcap=hv1/vif11-tx.pcap \
+                              options:rxq_pcap=hv1/vif11-rx.pcap \
+                              ofport-request=11
+OVS_WAIT_UNTIL([test x`ovn-nbctl lsp-get-up lp11` = xup])
+
+as hv5 ovs-vsctl add-port br-int vif-north1 -- \
+        set Interface vif-north1 external-ids:iface-id=lp-north1 \
+                              options:tx_pcap=hv5/vif-north1-tx.pcap \
+                              options:rxq_pcap=hv5/vif-north1-rx.pcap \
+                              ofport-request=44
+
+as hv5 ovs-vsctl add-port br-int vif-north2 -- \
+        set Interface vif-north2 external-ids:iface-id=lp-north2 \
+                              options:tx_pcap=hv5/vif-north2-tx.pcap \
+                              options:rxq_pcap=hv5/vif-north2-rx.pcap \
+                              ofport-request=45
+
+as hv5 ovs-vsctl add-port br-int vif-north3 -- \
+        set Interface vif-north3 external-ids:iface-id=lp-north3 \
+                              options:tx_pcap=hv5/vif-north3-tx.pcap \
+                              options:rxq_pcap=hv5/vif-north3-rx.pcap \
+                              ofport-request=46
+
+ovn-nbctl lrp-set-gateway-chassis DR-S1 hv2
+ovn-nbctl lrp-set-gateway-chassis DR-S2 hv3
+ovn-nbctl lrp-set-gateway-chassis DR-S3 hv4
+
+ovn-nbctl --wait=sb sync
+OVN_POPULATE_ARP
+
+vif_to_ls () {
+    case ${1} in dnl (
+        vif?[[11]]) echo ls ;; dnl (
+        vif-north1) echo ls-north1 ;; dnl (
+        vif-north2) echo ls-north2 ;; dnl (
+        vif-north3) echo ls-north3 ;; dnl (
+        *) AT_FAIL_IF([:]) ;;
+    esac
+}
+
+vif_to_hv () {
+    case ${1} in dnl (
+        vif[[1]]?) echo hv1 ;; dnl (
+        vif-north1) echo hv5 ;; dnl (
+        vif-north2) echo hv5 ;; dnl (
+        vif-north3) echo hv5 ;; dnl (
+        *) AT_FAIL_IF([:]) ;;
+    esac
+}
+
+vif_to_lrp () {
+    case ${1} in dnl (
+        vif?[[11]]) echo DR-ls ;; dnl (
+        *) AT_FAIL_IF([:]) ;;
+    esac
+
+}
+
+ip_to_hex() {
+       printf "%02x%02x%02x%02x" "${@}"
+}
+
+# test_arp INPORT SHA SPA TPA
+#
+# Causes a packet to be received on INPORT.  The packet is an ARP
+# request with SHA, SPA, and TPA as specified.
+test_arp() {
+    local inport=$1 sha=$2 spa=$3 tpa=$4
+    local request=ffffffffffff${sha}08060001080006040001${sha}${spa}ffffffffffff${tpa}
+    hv=`vif_to_hv $inport`
+    as $hv ovs-appctl netdev-dummy/receive $inport $request
+}
+
+
+test_ip() {
+        # This packet has bad checksums but logical L3 routing doesn't check.
+        local inport=${1} src_mac=${2} dst_mac=${3} src_ip=${4} dst_ip=${5} outport=${6}
+        local packet=${dst_mac}${src_mac}08004500001c0000000040110000${src_ip}${dst_ip}0035111100080000
+        shift; shift; shift; shift; shift
+        hv=`vif_to_hv $inport`
+        as $hv ovs-appctl netdev-dummy/receive $inport $packet
+        in_ls=`vif_to_ls $inport`
+        for outport; do
+            out_ls=`vif_to_ls $outport`
+            if test $in_ls = $out_ls; then
+                # Ports on the same logical switch receive exactly the same packet.
+                echo $packet
+            else
+                # Routing decrements TTL and updates source and dest MAC
+                # (and checksum).
+                # For North-South, packet will come via gateway chassis, i.e hv3
+                if test $inport = vif-north1; then
+                    echo f0000000001006ac1001000108004500001c000000003f110100${src_ip}${dst_ip}0035111100080000 >> $outport.expected
+                fi
+                if test $outport = vif-north1; then
+                    echo f0f00000001102ac1001000108004500001c000000003f110100${src_ip}${dst_ip}0035111100080000 >> $outport.expected
+                fi
+                if test $outport = vif-north2; then
+                    echo f0f00000002208ac1001000108004500001c000000003f110100${src_ip}${dst_ip}0035111100080000 >> $outport.expected
+                fi
+                if test $outport = vif-north3; then
+                    echo f0f00000003304ac1001000108004500001c000000003f110100${src_ip}${dst_ip}0035111100080000 >> $outport.expected
+                fi
+            fi >> $outport.expected
+        done
+}
+
+echo "------ OVN dump ------"
+ovn-nbctl show
+ovn-sbctl show
+ovn-sbctl list port_binding
+ovn-sbctl list mac_binding
+ovn-sbctl list datapath_binding
+
+ovn-sbctl dump-flows DR
+ovn-sbctl dump-flows S1
+ovn-sbctl dump-flows ls
+
+echo "------ hv1 dump ------"
+as hv1 ovs-vsctl show
+as hv1 ovs-vsctl list Open_Vswitch
+as hv1 ovs-ofctl dump-flows br-int
+
+echo "------ hv2 dump ------"
+as hv2 ovs-vsctl show
+as hv2 ovs-vsctl list Open_Vswitch
+as hv2 ovs-ofctl dump-flows br-int
+
+echo "------ hv3 dump ------"
+as hv3 ovs-vsctl show
+as hv3 ovs-vsctl list Open_Vswitch
+as hv3 ovs-ofctl dump-flows br-int
+
+echo "------ hv4 dump ------"
+as hv4 ovs-vsctl show
+as hv4 ovs-vsctl list Open_Vswitch
+as hv5 ovs-ofctl dump-flows br-int
+
+# N-S with lp-north1
+echo "Send Dummy ARP"
+sip=`ip_to_hex 172 16 1 10`
+tip=`ip_to_hex 172 16 1 50`
+test_arp vif-north1 f0f000000011 $sip $tip
+
+echo "Send traffic North to South"
+sip=`ip_to_hex 172 16 1 10`
+dip=`ip_to_hex 20 0 0 10`
+test_ip vif-north1 f0f000000011 02ac10010001 $sip $dip vif11
+# Confirm that North to south traffic works fine.
+OVN_CHECK_PACKETS([hv1/vif11-tx.pcap], [vif11.expected])
+
+echo "Send traffic South to North"
+sip=`ip_to_hex 20 0 0 10`
+dip=`ip_to_hex 172 16 1 10`
+test_ip vif11 f00000000010 06ac10010001 $sip $dip vif-north1
+# Confirm that South to North traffic works fine.
+OVN_CHECK_PACKETS([hv5/vif-north1-tx.pcap], [vif-north1.expected])
+
+# N-S with lp-north2
+echo "Send Dummy ARP"
+sip=`ip_to_hex 10 0 0 10`
+tip=`ip_to_hex 10 0 0 50`
+test_arp vif-north2 f0f000000022 $sip $tip
+
+echo "Send traffic South to North"
+sip=`ip_to_hex 20 0 0 10`
+dip=`ip_to_hex 10 0 0 10`
+test_ip vif11 f00000000010 06ac10010001 $sip $dip vif-north2
+# Confirm that South to North traffic works fine.
+OVN_CHECK_PACKETS([hv5/vif-north2-tx.pcap], [vif-north2.expected])
+
+# N-S with lp-north3
+echo "Send Dummy ARP"
+sip=`ip_to_hex 192 168 0 10`
+tip=`ip_to_hex 192 168 0 50`
+test_arp vif-north3 f0f000000033 $sip $tip
+
+echo "Send traffic South to North"
+sip=`ip_to_hex 20 0 0 10`
+dip=`ip_to_hex 192 168 0 10`
+test_ip vif11 f00000000010 06ac10010001 $sip $dip vif-north3
+# Confirm that South to North traffic works fine.
+OVN_CHECK_PACKETS([hv5/vif-north3-tx.pcap], [vif-north3.expected])
+
+AT_CLEANUP
diff --git a/utilities/ovn-nbctl.c b/utilities/ovn-nbctl.c
index 2c77f4ba7..af93622a5 100644
--- a/utilities/ovn-nbctl.c
+++ b/utilities/ovn-nbctl.c
@@ -781,7 +781,7 @@ NAT commands:\n\
   lr-nat-add ROUTER TYPE EXTERNAL_IP LOGICAL_IP [LOGICAL_PORT EXTERNAL_MAC]\n\
                             [EXTERNAL_PORT_RANGE]\n\
                             add a NAT to ROUTER\n\
-  lr-nat-del ROUTER [TYPE [IP]]\n\
+  lr-nat-del ROUTER [TYPE [IP [EXTERNAL_IP]]]\n\
                             remove NATs from ROUTER\n\
   lr-nat-list ROUTER        print NATs for ROUTER\n\
 \n\
@@ -4285,6 +4285,90 @@ done:
     return ret;
 }
 
+static bool
+is_nat_rule_conflict(const struct nbrec_logical_router *lr,
+                     char *new_external_ip, char *old_external_ip, bool is_v6)
+{
+    int num_l3dgw_ports = 0;
+    bool is_conflict = false;
+
+    struct lport_addresses old_external_ip_addr, new_external_ip_addr;
+
+    if (!extract_ip_addresses(new_external_ip, &new_external_ip_addr) ||
+        !extract_ip_addresses(old_external_ip, &old_external_ip_addr)) {
+        static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
+        VLOG_WARN_RL(&rl, "Extract addresses failed.");
+        return true;
+    }
+
+    if (is_v6) {
+        ovs_assert(new_external_ip_addr.n_ipv6_addrs == 1);
+        ovs_assert(old_external_ip_addr.n_ipv6_addrs == 1);
+    } else {
+        ovs_assert(new_external_ip_addr.n_ipv4_addrs == 1);
+        ovs_assert(old_external_ip_addr.n_ipv4_addrs == 1);
+    }
+
+    for (size_t i = 0; i < lr->n_ports; i++) {
+        const struct nbrec_logical_router_port *lrp = lr->ports[i];
+        const struct nbrec_logical_router_port *old_port = NULL;
+        const struct nbrec_logical_router_port *new_port = NULL;
+        if (lrp->n_gateway_chassis) {
+            num_l3dgw_ports++;
+            struct lport_addresses lrp_addrs;
+            if (!extract_lrp_networks(lr->ports[i], &lrp_addrs)) {
+                static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
+                VLOG_WARN_RL(&rl, "Extract addresses failed.");
+                continue;
+            }
+
+            if (is_v6) {
+                for (int j = 0; j < lrp_addrs.n_ipv6_addrs; j++) {
+                    struct ipv6_netaddr *lrp6_addr = &lrp_addrs.ipv6_addrs[j];
+                    struct in6_addr new_ip6_mask, old_ip6_mask;
+                    new_ip6_mask = ipv6_addr_bitand(&lrp6_addr->mask,
+                                   &new_external_ip_addr.ipv6_addrs[0].addr);
+                    old_ip6_mask = ipv6_addr_bitand(&lrp6_addr->mask,
+                                   &old_external_ip_addr.ipv6_addrs[0].addr);
+                    if (ipv6_addr_equals(&new_ip6_mask, &(lrp6_addr->network))) {
+                        new_port = lrp;
+                    }
+                    if (ipv6_addr_equals(&old_ip6_mask, &(lrp6_addr->network))) {
+                        old_port = lrp;
+                    }
+                }
+            } else {
+                for (int j = 0; j < lrp_addrs.n_ipv4_addrs; j++) {
+                    uint32_t nw_addr = ntohl(lrp_addrs.ipv4_addrs[j].network);
+                    uint32_t mask = ntohl(lrp_addrs.ipv4_addrs[j].mask);
+                    uint32_t bcast = nw_addr | ~mask;
+                    uint32_t new_ip, old_ip;
+                    new_ip = ntohl(new_external_ip_addr.ipv4_addrs[0].addr);
+                    old_ip = ntohl(old_external_ip_addr.ipv4_addrs[0].addr);
+                    if (new_ip >= nw_addr && new_ip < bcast) {
+                        new_port = lrp;
+                    }
+                    if (old_ip >= nw_addr && old_ip < bcast) {
+                        old_port = lrp;
+                    }
+                }
+            }
+            if ((old_port || new_port) && (old_port == new_port)) {
+                is_conflict = true;
+            }
+            destroy_lport_addresses(&lrp_addrs);
+        }
+    }
+    destroy_lport_addresses(&old_external_ip_addr);
+    destroy_lport_addresses(&new_external_ip_addr);
+
+    if (num_l3dgw_ports > 1 && !is_conflict) {
+        return false;
+    }
+
+    return true;
+}
+
 static void
 nbctl_lr_nat_add(struct ctl_context *ctx)
 {
@@ -4446,12 +4530,16 @@ nbctl_lr_nat_add(struct ctl_context *ctx)
                             should_return = true;
                         }
                 } else {
-                    ctl_error(ctx, "a NAT with this type (%s) and %s (%s) "
-                              "already exists",
-                              nat_type,
-                              is_snat ? "logical_ip" : "external_ip",
-                              is_snat ? new_logical_ip : new_external_ip);
-                    should_return = true;
+                    if (!is_snat ||
+                        is_nat_rule_conflict(lr, new_external_ip,
+                                             old_external_ip, is_v6)) {
+                        ctl_error(ctx, "a NAT with this type (%s) and %s (%s) "
+                                  "already exists",
+                                  nat_type,
+                                  is_snat ? "logical_ip" : "external_ip",
+                                  is_snat ? new_logical_ip : new_external_ip);
+                        should_return = true;
+                    }
                 }
             }
         }
@@ -4547,6 +4635,19 @@ nbctl_lr_nat_del(struct ctl_context *ctx)
     }
 
     int is_snat = !strcmp("snat", nat_type);
+    char *nat_external_ip = NULL;
+    if (ctx->argc == 5) {
+        if (is_snat) {
+            nat_external_ip = normalize_prefix_str(ctx->argv[4]);
+            if (!nat_external_ip) {
+                ctl_error(ctx, "%s: Invalid IP address or CIDR", ctx->argv[4]);
+            }
+        } else {
+            ctl_error(ctx, "%s type takes a maximum of one ip address", nat_type);
+        }
+    }
+    bool is_exist = false;
+
     /* Remove the matching NAT. */
     for (size_t i = 0; i < lr->n_nat; i++) {
         struct nbrec_nat *nat = lr->nat[i];
@@ -4558,8 +4659,29 @@ nbctl_lr_nat_del(struct ctl_context *ctx)
             continue;
         }
         if (!strcmp(nat_type, nat->type) && !strcmp(nat_ip, old_ip)) {
-            nbrec_logical_router_update_nat_delvalue(lr, nat);
-            should_return = true;
+            if (nat_external_ip != NULL) {
+                char *old_external_ip = normalize_prefix_str(nat->external_ip);
+                if (!old_external_ip) {
+                    continue;
+                }
+                if (!strcmp(nat_external_ip, old_external_ip)) {
+                    nbrec_logical_router_update_nat_delvalue(lr, nat);
+                    free(old_external_ip);
+                    is_exist = true;
+                    should_return = true;
+                }
+            } else {
+                nbrec_logical_router_update_nat_delvalue(lr, nat);
+                /* When nat_type is snat and external_ip is not specified, we
+                 * need to iterate over all the rules and delete all nat entries
+                 * matching the logical ip. Hence don't set should_return for
+                 * snat case.
+                 */
+                if (!is_snat) {
+                    should_return = true;
+                }
+                is_exist = true;
+            }
         }
         free(old_ip);
         if (should_return) {
@@ -4567,13 +4689,16 @@ nbctl_lr_nat_del(struct ctl_context *ctx)
         }
     }
 
-    if (must_exist) {
+    if (must_exist && !is_exist) {
         ctl_error(ctx, "no matching NAT with the type (%s) and %s (%s)",
                   nat_type, is_snat ? "logical_ip" : "external_ip", nat_ip);
     }
 
 cleanup:
     free(nat_ip);
+    if (nat_external_ip != NULL) {
+       free(nat_external_ip);
+    }
 }
 
 static void
@@ -6635,7 +6760,7 @@ static const struct ctl_command_syntax nbctl_commands[] = {
       "ROUTER TYPE EXTERNAL_IP LOGICAL_IP"
       "[LOGICAL_PORT EXTERNAL_MAC] [EXTERNAL_PORT_RANGE]", NULL,
       nbctl_lr_nat_add, NULL, "--may-exist,--stateless,--portrange", RW },
-    { "lr-nat-del", 1, 3, "ROUTER [TYPE [IP]]", NULL,
+    { "lr-nat-del", 1, 4, "ROUTER [TYPE [IP [EXTERNAL_IP]]]", NULL,
         nbctl_lr_nat_del, NULL, "--if-exists", RW },
     { "lr-nat-list", 1, 1, "ROUTER", NULL, nbctl_lr_nat_list, NULL, "", RO },
     { "lr-nat-update-ext-ip", 4, 4, "ROUTER TYPE IP ADDRESS_SET", NULL,
