> 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