diff -wurb qemu/slirp/udp.c qemu-patched/slirp/udp.c
--- qemu/slirp/udp.c	2005-07-03 19:08:43.000000000 +0200
+++ qemu-patched/slirp/udp.c	2006-05-02 12:19:22.000000000 +0200
@@ -312,8 +312,11 @@
     struct sockaddr_in saddr, daddr;
 
     saddr = *addr;
-    if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr)
+    if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
         saddr.sin_addr.s_addr = so->so_faddr.s_addr;
+        if ((so->so_faddr.s_addr & htonl(0x000000ff)) == htonl(0xff))
+            saddr.sin_addr.s_addr = special_addr.s_addr | htonl(CTL_ALIAS);
+    }
     daddr.sin_addr = so->so_laddr;
     daddr.sin_port = so->so_lport;