diff --git a/proto/ospf/iface.c b/proto/ospf/iface.c
index bef31125..04868baa 100644
--- a/proto/ospf/iface.c
+++ b/proto/ospf/iface.c
@@ -472,6 +472,9 @@ ospf_iface_new(struct proto_ospf *po, struct iface *iface, struct ifa *addr,
 
   WALK_LIST(nb, ip->nbma_list)
   {
+    if (!ipa_in_net(nb->ip, addr->prefix, addr->pxlen))
+      continue;
+
     nbma = mb_alloc(p->pool, sizeof(struct nbma_node));
     nbma->ip = nb->ip;
     nbma->eligible = nb->eligible;
diff --git a/proto/ospf/ospf.c b/proto/ospf/ospf.c
index e1ba96a4..a9dc1dee 100644
--- a/proto/ospf/ospf.c
+++ b/proto/ospf/ospf.c
@@ -855,7 +855,7 @@ ospf_reconfigure(struct proto *p, struct proto_config *c)
 	{
 	  found = 0;
 	  WALK_LIST(nb2, newip->nbma_list)
-	    if (ipa_compare(nb1->ip, nb2->ip) == 0)
+	    if (ipa_equal(nb1->ip, nb2->ip))
 	  {
 	    found = 1;
 	    if (nb1->eligible != nb2->eligible)
@@ -877,9 +877,12 @@ ospf_reconfigure(struct proto *p, struct proto_config *c)
 	/* And then add new */
 	WALK_LIST(nb2, newip->nbma_list)
 	{
+	  if (!ipa_in_net(nb2->ip, ifa->addr->prefix, ifa->addr->pxlen))
+	    continue;
+
 	  found = 0;
 	  WALK_LIST(nb1, ifa->nbma_list)
-	    if (ipa_compare(nb1->ip, nb2->ip) == 0)
+	    if (ipa_equal(nb1->ip, nb2->ip))
 	  {
 	    found = 1;
 	    break;