diff --git a/net.c b/net.c
index c5e6063..9ba5be2 100644
--- a/net.c
+++ b/net.c
@@ -1050,6 +1050,10 @@ static const struct {
                 .name = "mcast",
                 .type = QEMU_OPT_STRING,
                 .help = "UDP multicast address and port number",
+            }, {
+                .name = "localaddr",
+                .type = QEMU_OPT_STRING,
+                .help = "source address for multicast packets",
             },
             { /* end of list */ }
         },
diff --git a/net/socket.c b/net/socket.c
index 1c4e153..d443f4c 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -149,7 +149,7 @@ static void net_socket_send_dgram(void *opaque)
     qemu_send_packet(&s->nc, s->buf, size);
 }
 
-static int net_socket_mcast_create(struct sockaddr_in *mcastaddr)
+static int net_socket_mcast_create(struct sockaddr_in *mcastaddr, struct in_addr *localaddr)
 {
     struct ip_mreq imr;
     int fd;
@@ -201,6 +201,15 @@ static int net_socket_mcast_create(struct sockaddr_in *mcastaddr)
 	goto fail;
     }
 
+    /* If a bind address is given, only send packets from that address */
+    if (localaddr != NULL) {
+        ret = setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, localaddr, sizeof(*localaddr));
+        if (ret < 0) {
+            perror("setsockopt(IP_MULTICAST_IF)");
+            goto fail;
+        }
+    }
+
     socket_set_nonblock(fd);
     return fd;
 fail:
@@ -248,7 +257,7 @@ static NetSocketState *net_socket_fd_init_dgram(VLANState *vlan,
 		return NULL;
 	    }
 	    /* clone dgram socket */
-	    newfd = net_socket_mcast_create(&saddr);
+	    newfd = net_socket_mcast_create(&saddr, NULL);
 	    if (newfd < 0) {
 		/* error already reported by net_socket_mcast_create() */
 		close(fd);
@@ -468,17 +477,26 @@ static int net_socket_connect_init(VLANState *vlan,
 static int net_socket_mcast_init(VLANState *vlan,
                                  const char *model,
                                  const char *name,
-                                 const char *host_str)
+                                 const char *host_str,
+                                 const char *localaddr_str)
 {
     NetSocketState *s;
     int fd;
     struct sockaddr_in saddr;
+    struct in_addr localaddr, *param_localaddr;
 
     if (parse_host_port(&saddr, host_str) < 0)
         return -1;
 
+    if (localaddr_str != NULL) {
+        if (inet_aton(localaddr_str, &localaddr) == 0)
+            return -1;
+        param_localaddr = &localaddr;
+    } else {
+        param_localaddr = NULL;
+    }
 
-    fd = net_socket_mcast_create(&saddr);
+    fd = net_socket_mcast_create(&saddr, param_localaddr);
     if (fd < 0)
 	return -1;
 
@@ -505,8 +523,9 @@ int net_init_socket(QemuOpts *opts,
 
         if (qemu_opt_get(opts, "listen") ||
             qemu_opt_get(opts, "connect") ||
-            qemu_opt_get(opts, "mcast")) {
-            error_report("listen=, connect= and mcast= is invalid with fd=");
+            qemu_opt_get(opts, "mcast") ||
+            qemu_opt_get(opts, "localaddr")) {
+            error_report("listen=, connect=, mcast= and localaddr= is invalid with fd=\n");
             return -1;
         }
 
@@ -524,8 +543,9 @@ int net_init_socket(QemuOpts *opts,
 
         if (qemu_opt_get(opts, "fd") ||
             qemu_opt_get(opts, "connect") ||
-            qemu_opt_get(opts, "mcast")) {
-            error_report("fd=, connect= and mcast= is invalid with listen=");
+            qemu_opt_get(opts, "mcast") ||
+            qemu_opt_get(opts, "localaddr")) {
+            error_report("fd=, connect=, mcast= and localaddr= is invalid with listen=\n");
             return -1;
         }
 
@@ -539,8 +559,9 @@ int net_init_socket(QemuOpts *opts,
 
         if (qemu_opt_get(opts, "fd") ||
             qemu_opt_get(opts, "listen") ||
-            qemu_opt_get(opts, "mcast")) {
-            error_report("fd=, listen= and mcast= is invalid with connect=");
+            qemu_opt_get(opts, "mcast") ||
+            qemu_opt_get(opts, "localaddr")) {
+            error_report("fd=, listen=, mcast= and localaddr= is invalid with connect=\n");
             return -1;
         }
 
@@ -550,7 +571,7 @@ int net_init_socket(QemuOpts *opts,
             return -1;
         }
     } else if (qemu_opt_get(opts, "mcast")) {
-        const char *mcast;
+        const char *mcast, *localaddr;
 
         if (qemu_opt_get(opts, "fd") ||
             qemu_opt_get(opts, "connect") ||
@@ -560,8 +581,9 @@ int net_init_socket(QemuOpts *opts,
         }
 
         mcast = qemu_opt_get(opts, "mcast");
+        localaddr = qemu_opt_get(opts, "localaddr");
 
-        if (net_socket_mcast_init(vlan, "socket", name, mcast) == -1) {
+        if (net_socket_mcast_init(vlan, "socket", name, mcast, localaddr) == -1) {
             return -1;
         }
     } else {
diff --git a/qemu-options.hx b/qemu-options.hx
index 4d99a58..accd16a 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1061,8 +1061,9 @@ DEF("net", HAS_ARG, QEMU_OPTION_net,
 #endif
     "-net socket[,vlan=n][,name=str][,fd=h][,listen=[host]:port][,connect=host:port]\n"
     "                connect the vlan 'n' to another VLAN using a socket connection\n"
-    "-net socket[,vlan=n][,name=str][,fd=h][,mcast=maddr:port]\n"
+    "-net socket[,vlan=n][,name=str][,fd=h][,mcast=maddr:port[,localaddr=addr]]\n"
     "                connect the vlan 'n' to multicast maddr and port\n"
+    "                use 'localaddr=addr' to specify the host address to send packets from\n"
 #ifdef CONFIG_VDE
     "-net vde[,vlan=n][,name=str][,sock=socketpath][,port=n][,group=groupname][,mode=octalmode]\n"
     "                connect the vlan 'n' to port 'n' of a vde switch running\n"
@@ -1256,7 +1257,7 @@ qemu linux.img -net nic,macaddr=52:54:00:12:34:57 \
                -net socket,connect=127.0.0.1:1234
 @end example
 
-@item -net socket[,vlan=@var{n}][,name=@var{name}][,fd=@var{h}] [,mcast=@var{maddr}:@var{port}]
+@item -net socket[,vlan=@var{n}][,name=@var{name}][,fd=@var{h}][,mcast=@var{maddr}:@var{port}[,localaddr=@var{addr}]]
 
 Create a VLAN @var{n} shared with another QEMU virtual
 machines using a UDP multicast socket, effectively making a bus for
@@ -1296,6 +1297,12 @@ qemu linux.img -net nic,macaddr=52:54:00:12:34:56 \
 /path/to/linux ubd0=/path/to/root_fs eth0=mcast
 @end example
 
+Example (send packets from host's 1.2.3.4):
+@example
+qemu linux.img -net nic,macaddr=52:54:00:12:34:56 \
+               -net socket,mcast=239.192.168.1:1102,localaddr=1.2.3.4
+@end example
+
 @item -net vde[,vlan=@var{n}][,name=@var{name}][,sock=@var{socketpath}] [,port=@var{n}][,group=@var{groupname}][,mode=@var{octalmode}]
 Connect VLAN @var{n} to PORT @var{n} of a vde switch running on host and
 listening for incoming connections on @var{socketpath}. Use GROUP @var{groupname}
