I've tried version 1.9.2.7.-d-r2295 from SVN and IPv6 (6in4 tunnel) is working OK. However, when I tried to use ipv6 conntrack, it seemed to be reasonably unstable.
CONFIG_IP6_NF_CONNTRACK=y cause random system restarts within a few hours and CONFIG_IP6_NF_MATCH_STATE=m and ip6t_state module loaded cause total freeze within an hour afrer boot.
I know, these options are not enabled in default config, so I reverted back to original settings and use ! --syn option for incoming tcp and disable udp ports 1024:65535 instead.
It's a pity that backported ip6 conntrack doesn't work, but it will in the future, I hope ;-)
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