(usagi-users 03600) Bug in IPv6 socket MTU ?

Hi,

I need to set the mtu of my IPv6 sent packet via
setsocktopt(). I tried, but apparently linux 2.6.15
doesn't take it into account : packet are still fragmente
with the mtu defined on the interface.

Proof of concept code can be downloaded here :

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

This code send 1 IPv6 packet/s with 2000 bytes of data, and set
the MTU to 1280. On my box, the MTU is still at 1500.

Looking at the code in net/ipv6/ip6_output, function ip6_fragment, it
doesn't seems to be difficult to have this fixed, taking in account
the value set by the IPV6_MTU setsockopt call. Could you do it ? 


Thanks,

Hoerdt Mickaël