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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16668#discussion_r675139489">sys/net/application_layer/dhcpv6/client.c</a>:</p>
<pre style='color:#555'>> +#if IS_USED(MODULE_EVENT_TIMEOUT_ZTIMER)
+    event_timeout_ztimer_init(timeout, ZTIMER_SEC, event_queue, event);
+    event_timeout_set(timeout, delay_sec);
+#else
+    event_timeout_init(timeout, event_queue, event);
+    /* use xtimer_set64 instead of event_timeout_set to prevent overflows */
+    xtimer_set64(&timeout->timer, ((uint64_t)delay_sec) * US_PER_SEC);
+#endif
</pre>
<p>This may still be problematic since gnrc_dhcp <code>dhcpv6_client_conf_prefix</code> and nib <code>_nib_pl_add</code> have a max addr lifetime of uint32_max-1 msecs or infite<br>
which will make the addr last shorter that its T1 and T2 timeout</p>

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