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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16750#discussion_r717102710">sys/net/gnrc/routing/ipv6_auto_subnets/gnrc_ipv6_auto_subnets.c</a>:</p>
<pre style='color:#555'>> +typedef struct __attribute__((packed)) {
+    uint8_t num_subnets;    /**< number of subnets a host wants to create */
+} auto_subnets_request_t;
</pre>
<p>I think the upper nibble of the first byte is enough for that (like in IP). The remaining bits can be reserved for future use as well.</p>

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