From 0bd26d83c8ad9a47474faf55d7453d8f3309affc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Dawans?= <sebastien.dawans@cetic.be>
Date: Thu, 25 Jul 2013 11:21:04 +0200
Subject: [PATCH] Ignore No-Path DAO if target is already reachable through a
 different route than the DAO sender

---
 core/net/rpl/rpl-icmp6.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/net/rpl/rpl-icmp6.c b/core/net/rpl/rpl-icmp6.c
index 92cb319ae..4f3f6c4c9 100644
--- a/core/net/rpl/rpl-icmp6.c
+++ b/core/net/rpl/rpl-icmp6.c
@@ -655,7 +655,7 @@ dao_input(void)
 
   if(lifetime == RPL_ZERO_LIFETIME) {
     /* No-Path DAO received; invoke the route purging routine. */
-    if(rep != NULL && rep->state.saved_lifetime == 0 && rep->length == prefixlen) {
+    if(rep != NULL && rep->state.saved_lifetime == 0 && rep->length == prefixlen && uip_ipaddr_cmp(&rep->nexthop, &dao_sender_addr)) {
       PRINTF("RPL: Setting expiration timer for prefix ");
       PRINT6ADDR(&prefix);
       PRINTF("\n");