<blockquote>
<p>You'll need to disable header compression in order to get fragmentation working:</p>
</blockquote>
<p>Why? However, I applied your patch and it does. Nice!</p>
<pre><code>
> Do you have an 802.15.4 device at hand and could test if fragmentation works there

I've tested between two iotlab-m3 nodes on the testbed. Everything seems to be fine:
</code></pre>
<p>ping6 -c 10 fe80::1711:6b10:65f6:5d02 -s 1000<br>
1008 bytes from fe80::1711:6b10:65f6:5d02: icmp_seq=0 ttl=64 time=135.090 ms<br>
1008 bytes from fe80::1711:6b10:65f6:5d02: icmp_seq=1 ttl=64 time=126.757 ms<br>
1008 bytes from fe80::1711:6b10:65f6:5d02: icmp_seq=2 ttl=64 time=131.861 ms<br>
1008 bytes from fe80::1711:6b10:65f6:5d02: icmp_seq=3 ttl=64 time=135.096 ms<br>
1008 bytes from fe80::1711:6b10:65f6:5d02: icmp_seq=4 ttl=64 time=135.726 ms<br>
1008 bytes from fe80::1711:6b10:65f6:5d02: icmp_seq=5 ttl=64 time=140.846 ms<br>
1008 bytes from fe80::1711:6b10:65f6:5d02: icmp_seq=6 ttl=64 time=144.670 ms<br>
1008 bytes from fe80::1711:6b10:65f6:5d02: icmp_seq=7 ttl=64 time=138.280 ms<br>
1008 bytes from fe80::1711:6b10:65f6:5d02: icmp_seq=8 ttl=64 time=137.001 ms<br>
1008 bytes from fe80::1711:6b10:65f6:5d02: icmp_seq=9 ttl=64 time=141.885 ms</p>
<p>--- fe80::1711:6b10:65f6:5d02 PING statistics ---<br>
10 packets transmitted, 10 packets received, 0% packet loss<br>
round-trip min/avg/max = 126.757/136.721/144.670 ms</p>
<pre><code></code></pre>

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