Index: ip_input.c
===================================================================
RCS file: /home/ncvs/src/sys/netinet/ip_input.c,v
retrieving revision 1.149
diff -u -u -2 -0 -r1.149 ip_input.c
--- ip_input.c	2000/11/25 07:35:33	1.149
+++ ip_input.c	2001/01/31 08:34:55
@@ -489,41 +489,42 @@
 
 #ifdef BOOTP_COMPAT
 		if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY)
 			goto ours;
 #endif
 #ifdef IPFIREWALL_FORWARD
 		/*
 		 * If the addr to forward to is one of ours, we pretend to
 		 * be the destination for this packet.
 		 */
 		if (ip_fw_fwd_addr == NULL) {
 			if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr)
 				goto ours;
 		} else if (IA_SIN(ia)->sin_addr.s_addr ==
 					 ip_fw_fwd_addr->sin_addr.s_addr)
 			goto ours;
 #else
 		if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr)
 			goto ours;
 #endif
-		if (ia->ia_ifp && ia->ia_ifp->if_flags & IFF_BROADCAST) {
+		if (ia->ia_ifp && ia->ia_ifp->if_flags & IFF_BROADCAST &&
+		    ia->ia_netmask != 0xffffffff) {
 			if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
 			    ip->ip_dst.s_addr)
 				goto ours;
 			if (ip->ip_dst.s_addr == ia->ia_netbroadcast.s_addr)
 				goto ours;
 		}
 	}
 	if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
 		struct in_multi *inm;
 		if (ip_mrouter) {
 			/*
 			 * If we are acting as a multicast router, all
 			 * incoming multicast packets are passed to the
 			 * kernel-level multicast forwarding function.
 			 * The packet is returned (relatively) intact; if
 			 * ip_mforward() returns a non-zero value, the packet
 			 * must be discarded, else it may be accepted below.
 			 */
 			if (ip_mforward(ip, m->m_pkthdr.rcvif, m, 0) != 0) {
 				ipstat.ips_cantforward++;