Hi,

In my precedent mails, i pointed out that IPV6_MTU setsockopt
was ineffective because the field frag_size was not used further
in the ipv6 fragment code of the kernel. You can check out
that this is the case by this simple proof of concept code :

http://clarinet.u-strasbg.fr/~hoerdt/mtu.c

The fix is very simple, it only grab the value of frag_size and
use it in ip6_fragment file, could you please review the patch which
fix that problem at :

http://clarinet.u-strasbg.fr/~hoerdt/ip6_output.c.softfrag.patch

Thanks for the attention,

Hoerdt Mickaël