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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16568#discussion_r659711842">sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c</a>:</p>
<pre style='color:#555'>> +    if (final) {
+        ext_opts = _build_final_ext_opts(netif);
+    } else {
</pre>
<p>Ok, yeah, a router that does not self-advertise as a router is basically just not a default router, but why then add the RIO <em>only</em> in the final RA?</p>

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