From 373e5653e64ef1756a411bbeb4b7a58b4b5278db Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pablo=20Corbal=C3=A1n?= <paul.corbalan@gmail.com>
Date: Sun, 12 Jun 2016 16:09:45 +0100
Subject: [PATCH] uIPv6: Make sure dest address is not multicast before
 refreshing the state of a neighbor

---
 core/net/ipv6/uip6.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/core/net/ipv6/uip6.c b/core/net/ipv6/uip6.c
index 88df55340..be43e1a20 100644
--- a/core/net/ipv6/uip6.c
+++ b/core/net/ipv6/uip6.c
@@ -1156,7 +1156,9 @@ uip_process(uint8_t flag)
 
   /* Refresh neighbor state after receiving a unicast message */
 #if UIP_ND6_SEND_NA
-  uip_ds6_nbr_refresh_reachable_state(&UIP_IP_BUF->srcipaddr);
+  if(!uip_is_addr_mcast(&UIP_IP_BUF->destipaddr)) {
+    uip_ds6_nbr_refresh_reachable_state(&UIP_IP_BUF->srcipaddr);
+  }
 #endif /* UIP_ND6_SEND_NA */
 
 #if UIP_CONF_ROUTER