Clients don't receive ipv6 cause no global reachable address on your interfaces. Ticket says ipv6 gui might be busted.

Try this (obtained from tunnelbroker, linux-route2):
ip tunnel add he-ipv6 mode sit remote 216.66.84.46 local YOUR_IP ttl 255
ip link set he-ipv6 up
ip addr add 2001:470:1f14:31e::2/64 dev he-ipv6
ip route add ::/0 dev he-ipv6
ip addr add 2001:470:1f15:31e::1/64 dev br0
then try to ping6 2001:470:0:64::2

If works create radvd (router advertisment daemon) config and run it. I posted a config earlier.