<p></p>
<p><b>@miri64</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/8823#discussion_r651831693">sys/net/gnrc/network_layer/ipv6/nib/nib.c</a>:</p>
<pre style='color:#555'>> @@ -838,9 +837,30 @@ static void _handle_nbr_sol(gnrc_netif_t *netif, const ipv6_hdr_t *ipv6,
     DEBUG("     - Destination address: %s\n",
           ipv6_addr_to_str(addr_str, &ipv6->dst, sizeof(addr_str)));
 #if GNRC_IPV6_NIB_CONF_SLAAC
-    /* TODO SLAAC behavior */
+    gnrc_netif_t *tgt_netif = gnrc_netif_get_by_ipv6_addr(&nbr_sol->tgt);
</pre>
<blockquote>
<p>Now the NS is answered for all interfaces, but why is the neighbor sending a NS for the second interface in the first place when it should instead just route the packet to the next hop (<code>2001:16b8:45b5:9af8:5884:3bff:fe4f:a903%7</code>).</p>
</blockquote>
<p>Ah now I got the sentence. Well is the next hop in the neighbor cache already? If not, NDP needs to find the neighbor first. Just because it is in the FIB does not mean the node is reachable under the definition of NDP.</p>

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