diff --git a/ripd/rip_interface.c b/ripd/rip_interface.c
index b472522..2668e7d 100644
--- a/ripd/rip_interface.c
+++ b/ripd/rip_interface.c
@@ -396,6 +396,106 @@
 						
   return count;
 }
+						
+						
+						
+
+/* Does this address belongs to me ? */
+int
+if_check_address (struct in_addr addr)
+{
+  listnode node;
+
+  for (node = listhead (iflist); node; nextnode (node))
+    {
+      listnode cnode;
+      struct interface *ifp;
+
+      ifp = getdata (node);
+
+      for (cnode = listhead (ifp->connected); cnode; nextnode (cnode))
+	{
+	  struct connected *connected;
+	  struct prefix_ipv4 *p;
+
+	  connected = getdata (cnode);
+	  p = (struct prefix_ipv4 *) connected->address;
+
+	  if (p->family != AF_INET)
+	    continue;
+
+	  if (IPV4_ADDR_CMP (&p->prefix, &addr) == 0)
+	    return 1;
+	}
+    }
+  return 0;
+}
+
+/* is this address from a valid neighbor? (RFC2453 - Sec. 3.9.2) */
+int
+if_valid_neighbor (struct in_addr addr)
+{
+  listnode node;
+  struct connected *connected = NULL;
+  struct prefix_ipv4 *p;
+
+  for (node = listhead (iflist); node; nextnode (node))
+    {
+      listnode cnode;
+      struct interface *ifp;
+
+      ifp = getdata (node);
+
+      for (cnode = listhead (ifp->connected); cnode; nextnode (cnode))
+	{
+	  struct prefix *pxn = NULL; /* Prefix of the neighbor */
+	  struct prefix *pxc = NULL; /* Prefix of the connected network */
+
+	  connected = getdata (cnode);
+
+	  if (if_is_pointopoint (ifp))
+	    {
+	      p = (struct prefix_ipv4 *) connected->address;
+
+	      if (p && p->family == AF_INET)
+		{
+		  if (IPV4_ADDR_SAME (&p->prefix, &addr))
+		    return 1;
+
+		  p = (struct prefix_ipv4 *) connected->destination;
+		  if (p && IPV4_ADDR_SAME (&p->prefix, &addr))
+		    return 1;
+		}
+	    }
+	  else
+	    {
+	      p = (struct prefix_ipv4 *) connected->address;
+
+	      if (p->family != AF_INET)
+		continue;
+
+	      pxn = prefix_new();
+	      pxn->family = AF_INET;
+	      pxn->prefixlen = 32;
+	      pxn->u.prefix4 = addr;
+	      
+	      pxc = prefix_new();
+	      prefix_copy(pxc, (struct prefix *) p);
+	      apply_mask(pxc);
+	  
+	      if (prefix_match (pxc, pxn)) 
+		{
+		  prefix_free (pxn);
+		  prefix_free (pxc);
+		  return 1;
+		}
+	      prefix_free(pxc);
+	      prefix_free(pxn);
+	    }
+	}
+    }
+  return 0;
+}
 
 /* Inteface link down message processing. */
 int
diff --git a/ripd/ripd.c b/ripd/ripd.c
index d2a6b4d..68f49ac 100644
--- a/ripd/ripd.c
+++ b/ripd/ripd.c
@@ -1017,7 +1017,7 @@
   /* The datagram's IPv4 source address should be checked to see
      whether the datagram is from a valid neighbor; the source of the
      datagram must be on a directly connected network  */
-  if (if_lookup_address (from->sin_addr) == NULL)
+  if (! if_valid_neighbor (from->sin_addr)) 
     {
       zlog_info ("This datagram doesn't came from a valid neighbor: %s",
 		 inet_ntoa (from->sin_addr));
@@ -1602,7 +1602,7 @@
     }
 
   /* Check is this packet comming from myself? */
-  if (if_lookup_exact_address (from.sin_addr)) 
+  if (if_check_address (from.sin_addr)) 
     {
       if (IS_RIP_DEBUG_PACKET)
 	zlog_warn ("ignore packet comes from myself");
diff --git a/ripd/ripd.h b/ripd/ripd.h
index c414c76..dc2f64d 100644
--- a/ripd/ripd.h
+++ b/ripd/ripd.h
@@ -374,6 +374,8 @@
 void rip_zclient_start ();
 void rip_zclient_reset ();
 void rip_offset_init ();
+int if_check_address (struct in_addr addr);
+int if_valid_neighbor (struct in_addr addr);
 
 int rip_request_send (struct sockaddr_in *, struct interface *, u_char);
 int rip_neighbor_lookup (struct sockaddr_in *);