fix #752 problem: ARP is not updating if mac address changed on remote side

1 files changed, 13 insertions, 0 deletions

diff --git a/zebra/interface.c b/zebra/interface.c
index b8426c6890..e355c88316 100644
--- a/zebra/interface.c
+++ b/zebra/interface.c
@@ -782,7 +782,20 @@ if_nbr_ipv6ll_to_ipv4ll_neigh_update (struct interface *ifp,
   inet_pton (AF_INET, buf, &ipv4_ll);
 
   ipv6_ll_address_to_mac(address, (u_char *)mac);
+  
+  /*
+   * Remove existed arp record for the interface, 
+   * because netlink protocol does not support message for update. 
+   * supported commands RTM_NEWNEIGH or RTM_DELNEIGH
+   */
+
+   kernel_neigh_update (0, ifp->ifindex, ipv4_ll.s_addr, mac, 6);
+  
+  /*
+   *  Add arp record
+   */
   kernel_neigh_update (add, ifp->ifindex, ipv4_ll.s_addr, mac, 6);
+  
   zvrf->neigh_updates++;
 }