<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_r651847612">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>
<p>Ok, yeah in that case I think it really is Node A thinking that <code>2001:16b8:45b5:9afb:ece6:c0ff:fe26:b99f</code> is on link. After all, masking that address with <code>ffff:ffff:ffff:ffff::/63</code> will give you <code>2001:16b8:45b5:9afa::/63</code>, as <code>0xa | 0x1 = 0xb</code> and 0xa only sets the first three bits of the last nibble.</p>

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