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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11623#discussion_r325012276">sys/net/gnrc/network_layer/ipv6/ext/frag/gnrc_ipv6_ext_frag.c</a>:</p>
<pre style='color:#555'>> +        switch (ptr->type) {
+            case GNRC_NETTYPE_IPV6: {
+                ipv6_hdr_t *hdr = ptr->data;
+                last_per_frag = ptr;
+                nh = hdr->nh;
+                break;
+            }
+            case GNRC_NETTYPE_IPV6_EXT: {
+                ipv6_ext_t *hdr = ptr->data;
+                switch (nh) {
+                    /* "[...] that is, all headers up to and including the
+                     * Routing header if present, else the Hop-by-Hop Options
+                     * header if present, [...]"
+                     * (IPv6 header comes before Hop-by-Hop Options comes before
+                     * Routing header, so an override to keep the quoted
+                     * priorities is ensured) */
</pre>
<p>That's why you have to have at least 1280 bytes PDU with IPv6 ;-).</p>

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