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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16568#discussion_r659661393">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>That's the thing that confused me too.<br>
A border router will sent this 'final RA', but it's still a router, so my interpretation was that this can't signal "I'm not a router".<br>
And when I added the RIO, Linux would just do the right thing and create a</p>
<pre><code>2001:16b8:4545:14f8::/62 via fe80::a4ed:29ff:feec:cbf3 dev eno1 proto ra metric 100 pref medium
</code></pre>
<p>so I was happy.</p>

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