Index: nf-next-2.6/net/netfilter/ipvs/Kconfig
===================================================================
--- nf-next-2.6.orig/net/netfilter/ipvs/Kconfig	2010-07-07 13:24:31.000000000 +0900
+++ nf-next-2.6/net/netfilter/ipvs/Kconfig	2010-07-07 13:38:23.000000000 +0900
@@ -3,7 +3,7 @@
 #
 menuconfig IP_VS
 	tristate "IP virtual server support"
-	depends on NET && INET && NETFILTER
+	depends on NET && INET && NETFILTER && NF_CONNTRACK
 	---help---
 	  IP Virtual Server support will let you build a high-performance
 	  virtual server based on cluster of two or more real servers. This
Index: nf-next-2.6/net/netfilter/ipvs/ip_vs_core.c
===================================================================
--- nf-next-2.6.orig/net/netfilter/ipvs/ip_vs_core.c	2010-07-07 13:23:37.000000000 +0900
+++ nf-next-2.6/net/netfilter/ipvs/ip_vs_core.c	2010-07-07 13:38:23.000000000 +0900
@@ -536,26 +536,6 @@ int ip_vs_leave(struct ip_vs_service *sv
 	return NF_DROP;
 }
 
-
-/*
- *      It is hooked before NF_IP_PRI_NAT_SRC at the NF_INET_POST_ROUTING
- *      chain, and is used for VS/NAT.
- *      It detects packets for VS/NAT connections and sends the packets
- *      immediately. This can avoid that iptable_nat mangles the packets
- *      for VS/NAT.
- */
-static unsigned int ip_vs_post_routing(unsigned int hooknum,
-				       struct sk_buff *skb,
-				       const struct net_device *in,
-				       const struct net_device *out,
-				       int (*okfn)(struct sk_buff *))
-{
-	if (!skb->ipvs_property)
-		return NF_ACCEPT;
-	/* The packet was sent from IPVS, exit this chain */
-	return NF_STOP;
-}
-
 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset)
 {
 	return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0));
@@ -1499,14 +1479,6 @@ static struct nf_hook_ops ip_vs_ops[] __
 		.hooknum        = NF_INET_FORWARD,
 		.priority       = 99,
 	},
-	/* Before the netfilter connection tracking, exit from POST_ROUTING */
-	{
-		.hook		= ip_vs_post_routing,
-		.owner		= THIS_MODULE,
-		.pf		= PF_INET,
-		.hooknum        = NF_INET_POST_ROUTING,
-		.priority       = NF_IP_PRI_NAT_SRC-1,
-	},
 #ifdef CONFIG_IP_VS_IPV6
 	/* After packet filtering, forward packet through VS/DR, VS/TUN,
 	 * or VS/NAT(change destination), so that filtering rules can be
@@ -1535,14 +1507,6 @@ static struct nf_hook_ops ip_vs_ops[] __
 		.hooknum        = NF_INET_FORWARD,
 		.priority       = 99,
 	},
-	/* Before the netfilter connection tracking, exit from POST_ROUTING */
-	{
-		.hook		= ip_vs_post_routing,
-		.owner		= THIS_MODULE,
-		.pf		= PF_INET6,
-		.hooknum        = NF_INET_POST_ROUTING,
-		.priority       = NF_IP6_PRI_NAT_SRC-1,
-	},
 #endif
 };
 
Index: nf-next-2.6/net/netfilter/ipvs/ip_vs_xmit.c
===================================================================
--- nf-next-2.6.orig/net/netfilter/ipvs/ip_vs_xmit.c	2010-07-07 13:23:37.000000000 +0900
+++ nf-next-2.6/net/netfilter/ipvs/ip_vs_xmit.c	2010-07-07 13:42:22.000000000 +0900
@@ -28,6 +28,7 @@
 #include <net/ip6_route.h>
 #include <linux/icmpv6.h>
 #include <linux/netfilter.h>
+#include <net/netfilter/nf_conntrack.h>
 #include <linux/netfilter_ipv4.h>
 
 #include <net/ip_vs.h>
@@ -348,6 +349,30 @@ ip_vs_bypass_xmit_v6(struct sk_buff *skb
 }
 #endif
 
+static void
+ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp)
+{
+	struct nf_conn *ct = (struct nf_conn *)skb->nfct;
+	struct nf_conntrack_tuple new_tuple;
+
+	if (ct == NULL || nf_ct_is_untracked(ct) || nf_ct_is_confirmed(ct))
+		return;
+
+	/*
+	 * The connection is not yet in the hashtable, so we update it.
+	 * CIP->VIP will remain the same, so leave the tuple in
+	 * IP_CT_DIR_ORIGINAL untouched.  When the reply comes back from the
+	 * real-server we will see RIP->DIP.
+	 */
+	new_tuple = ct->tuplehash[IP_CT_DIR_REPLY].tuple;
+	new_tuple.src.u3 = cp->daddr;
+	/*
+	 * This will also take care of UDP and other protocols.
+	 */
+	new_tuple.src.u.tcp.port = cp->dport;
+	nf_conntrack_alter_reply(ct, &new_tuple);
+}
+
 /*
  *      NAT transmitter (only for outside-to-inside nat forwarding)
  *      Not used for related ICMP
@@ -403,6 +428,8 @@ ip_vs_nat_xmit(struct sk_buff *skb, stru
 
 	IP_VS_DBG_PKT(10, pp, skb, 0, "After DNAT");
 
+	ip_vs_update_conntrack(skb, cp);
+
 	/* FIXME: when application helper enlarges the packet and the length
 	   is larger than the MTU of outgoing device, there will be still
 	   MTU problem. */
@@ -479,6 +506,8 @@ ip_vs_nat_xmit_v6(struct sk_buff *skb, s
 
 	IP_VS_DBG_PKT(10, pp, skb, 0, "After DNAT");
 
+	ip_vs_update_conntrack(skb, cp);
+
 	/* FIXME: when application helper enlarges the packet and the length
 	   is larger than the MTU of outgoing device, there will be still
 	   MTU problem. */
