Some of the existing ppp and vpn related scripts create and set

the IP addresses of the tunnel end points to the same value. In
these cases the loopback route is not installed for the local
end.

Verified by:	avg
MFC after:	5 days

sys/netinet/in.c

@@ -921,6 +921,12 @@ in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin,
 	if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY)
 		return (0);
 
+	if (ifp->if_flags & IFF_POINTOPOINT) {
+		if (ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
+			return (0);
+	}
+
+
 	/*
 	 * add a loopback route to self
 	 */