Debian Squeeze is running on a Soekris net5501 as an internet gateway. For use with shaping, there is an ip6tables rule like this: ip6tables -t mangle -A OUTPUT -j MARK --set-mark 0x4/0xf And the same with iptables (ipv4). radvd is set up to provide ipv6 addresses to LAN clients. Unfortunately the above ip6tables rule breaks radvd. Nothing different happens except clients do not seem to see the advertisements and so get no ipv6 address. I can't find any difference in debug logs, both ways I see: radvd[12393]: sending RA on br0 What's happening? Thanks.
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