diff -X exclude_files -Nabur ospfd2.11/linux/ospfd_linux.C ospfd2.12/linux/ospfd_linux.C
--- ospfd2.11/linux/ospfd_linux.C	Thu Nov  8 11:19:37 2001
+++ ospfd2.12/linux/ospfd_linux.C	Thu Nov 15 13:04:46 2001
@@ -270,6 +270,7 @@
     int plen;
     unsigned int fromlen;
     nlmsghdr *msg;
+    BSDPhyInt *phyp;
 
     plen = recvfrom(fd, buffer, sizeof(buffer), 0, 0, &fromlen);
     if (plen <= 0) {
@@ -315,6 +316,11 @@
 		}
 	    }
 	    syslog(LOG_NOTICE, "Interface addr change %s", inet_ntoa(in));
+	    if (msg->nlmsg_type == RTM_DELADDR &&
+	        (phyp = (BSDPhyInt *) phyints.find(ifm->ifa_index, 0)) &&
+		!(ifm->ifa_flags & IFA_F_SECONDARY)) {
+	        set_flags(phyp, phyp->flags & ~IFF_UP);
+	    }
 	    read_config();
 	    break;
           case RTM_NEWROUTE:
@@ -624,6 +630,8 @@
     int blen;
     AVLsearch iter(&directs);
     DirectRoute *rte;
+    AVLsearch iter2(&phyints);
+    BSDPhyInt *phyp;
 
     blen = MAXIFs*sizeof(ifreq);
     ifcbuf = new char[blen];
@@ -642,11 +650,14 @@
     interface_map.clear();
     while ((rte = (DirectRoute *)iter.next()))
         rte->valid = false;
+    while((phyp = (BSDPhyInt *)iter2.next())) {
+        phyp->addr = 0;
+	phyp->mask = 0;
+    }
 
     ifrp = (ifreq *) ifcbuf;
     end = (ifreq *)(ifcbuf + cfgreq.ifc_len);
     for (; ifrp < end; ifrp = (ifreq *)(((byte *)ifrp) + size)) {
-	BSDPhyInt *phyp;
 	ifreq ifr;
 	sockaddr_in *insock;
 	InAddr addr;
@@ -654,6 +665,8 @@
 	size = sizeof(InAddr) + sizeof(ifrp->ifr_name);
 	if (size < sizeof(ifreq))
 	    size = sizeof(ifreq);
+	if (ifrp->ifr_addr.sa_family != AF_INET)
+	    continue;
 	// Get interface flags
 	short ifflags;
 	memcpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
@@ -707,17 +720,18 @@
 	// store address information; real IP interfaces only
 	// Allow loopback interfaces; just not 127.x.x.x addresses
 	insock = (sockaddr_in *) &ifrp->ifr_addr;
-	if (phyp->tunl ||
-	    ifrp->ifr_addr.sa_family != AF_INET ||
-	    (ntoh32(insock->sin_addr.s_addr) & 0xff000000) == 0x7f000000)
+	if ((ntoh32(insock->sin_addr.s_addr) & 0xff000000) == 0x7f000000)
 	    continue;
-	addr = phyp->addr = ntoh32(insock->sin_addr.s_addr);
+	addr = ntoh32(insock->sin_addr.s_addr);
 	// Get subnet mask
 	if (ioctl(udpfd, SIOCGIFNETMASK, (char *)&ifr) < 0) {
 	    syslog(LOG_ERR, "SIOCGIFNETMASK Failed: %m");
 	    exit(1);
 	}
 	insock = (sockaddr_in *) &ifr.ifr_addr;
+	if (phyp->tunl && ntoh32(insock->sin_addr.s_addr) == 0xffffffff)
+	    continue;
+	phyp->addr = addr;
 	phyp->mask = ntoh32(insock->sin_addr.s_addr);
 	add_direct(phyp, addr, phyp->mask);
 	add_direct(phyp, addr, 0xffffffffL);
diff -X exclude_files -Nabur ospfd2.11/src/ospf.h ospfd2.12/src/ospf.h
--- ospfd2.11/src/ospf.h	Thu Nov  8 11:19:37 2001
+++ ospfd2.12/src/ospf.h	Thu Nov 15 13:04:46 2001
@@ -329,7 +329,7 @@
     // Version numbers
     enum {
 	vmajor = 2,	// Major version number
-	vminor = 11,	// Minor version number
+	vminor = 12,	// Minor version number
     };
 
     // Entry points into the OSPF code
diff -X exclude_files -Nabur ospfd2.11/src/rtrlsa.C ospfd2.12/src/rtrlsa.C
--- ospfd2.11/src/rtrlsa.C	Thu Nov  8 11:19:37 2001
+++ ospfd2.12/src/rtrlsa.C	Thu Nov 15 13:04:46 2001
@@ -107,6 +107,13 @@
     return(2 * sizeof(RtrLink));
 }
 
+/* How we advertise a point-to-point link's addresses depends
+ * on the interface mask. If set to all ones (0xffffffff) or 0, we
+ * do the traditional thing of advertising the neighbor's
+ * address. If instead the mask is set to something else, we
+ * advertise a route to the entire subnet.
+ */
+
 RtrLink *PPIfc::rl_insert(RTRhdr *rtrhdr, RtrLink *rlp)
 
 {
@@ -134,9 +141,16 @@
 
   adv_stub: // Advertise stub link to neighbor's IP address
 
-    if (state() == IFS_PP && !unnumbered() && np) {
+    if (state() == IFS_PP && !unnumbered() &&
+	(np || (if_mask != 0xffffffffL && if_mask != 0))) {
+        if (if_mask != 0xffffffffL && if_mask != 0) {
+	    rlp->link_id = hton32(if_net);
+	    rlp->link_data = hton32(if_mask);
+	}
+	else {
 	rlp->link_id = hton32(np->addr());
 	rlp->link_data = hton32(0xffffffffL);
+	}
 	rlp->link_type = LT_STUB;
 	rlp->n_tos = 0;
 	rlp->metric = hton16(if_cost);

.