fixed bug #43784 (a host should send at least one Router Solicitation)

CHANGELOG

@@ -205,6 +205,9 @@ HISTORY
 
   ++ Bugfixes:
 
+  2015-03-04: Simon Goldschmidt
+  * nd6.c: fixed bug #43784 (a host should send at least one Router Solicitation)
+
   2015-03-04: Valery Ushakov
   * ip6.c: fixed bug #41094 (Byte-order bug in IPv6 fragmentation header test)
 

src/core/ipv6/nd6.c

@@ -376,6 +376,10 @@ nd6_input(struct pbuf *p, struct netif *inp)
 
     /* If we are sending RS messages, stop. */
 #if LWIP_IPV6_SEND_ROUTER_SOLICIT
+    if (inp->rs_count == LWIP_ND6_MAX_MULTICAST_SOLICIT) {
+      /* ensure at least one solicitation is sent */
+      nd6_send_rs(inp);
+    }
     inp->rs_count = 0;
 #endif /* LWIP_IPV6_SEND_ROUTER_SOLICIT */