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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16530#discussion_r651770900">sys/net/gnrc/application_layer/dhcpv6/client_simple_pd.c</a>:</p>
<pre style='color:#555'>> +        if (netif != upstream) {
             dhcpv6_client_req_ia_pd(netif->pid, 64U);
         }
</pre>
<p>I don't see why we would want that, now if only <code>gnrc_dhcpv6_client_simple_pd</code> is selected this is a bug as also the upstream interface is selected for prefix delegation.</p>
<p>I think there is no need for a 'greedy' module: <code>gnrc_dhcpv6_client_simple_pd</code> could just be greedy by default if not specified otherwise (e.g. by excluding non-6lo interfaces)</p>

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