<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_r659632019">sys/net/gnrc/application_layer/dhcpv6/client.c</a>:</p>
<pre style='color:#555'>> @@ -174,6 +174,17 @@ void dhcpv6_client_conf_prefix(unsigned iface, const ipv6_addr_t *pfx,
             gnrc_rpl_root_init(CONFIG_GNRC_RPL_DEFAULT_INSTANCE, &addr, false, false);
         }
     }
+
+    /* start advertising subnet */
+    gnrc_ipv6_nib_change_rtr_adv_iface(netif, true);
+}
+
+void dhcpv6_client_conf_done(unsigned iface)
+{
+    gnrc_netif_t *netif = gnrc_netif_get_by_pid(iface);
+
+    /* inform upstream about subnets */
</pre>
<p>I think my main problem with this change is that it is separate from the ability to handle the route information option to me. Can we move the behavior changes for DHCPv6 to a separate PR?</p>

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