> Aha! I installed 2.6.21 from backports and it works. Thanks very much.
IPv6 under 2.6.21 is buggy (at least the upstream version, don't know
about the Debian kernel). Please use 2.6.20 or 2.6.22, both seem to
be fine.
http://lkml.org/lkml/2007/5/28/299
Juliusz