HE.net IPv6 tunnel gateway on Raspberry Pi

cat /etc/radvd.conf

interface eth0
{
  AdvSendAdvert on;
  AdvLinkMTU 1480;
  prefix 2001:230:19:2b4::/64
  {
    AdvOnLink on;
    AdvAutonomous on;
  };
};

execute

apt-get install radvd
/etc/init.d/radvd start

append /etc/network/interfaces:

auto he-ipv6
iface he-ipv6 inet6 v4tunnel
        address 2001:230:18:2b4::2
        netmask 64
        endpoint 216.218.221.6
        ttl 255
        gateway 2001:230:18:2b4::1
iface eth0 inet6 static
        address 2001:230:19:2b4::1
        netmask 64
        post-up ip6tables -A FORWARD -i he-ipv6 -o eth0 -p tcp --dport=1:2048 -j DROP

execute

/etc/init.d/networking

append /etc/sysctl.conf

net.ipv6.conf.all.forwarding=1

execute

sudo sysctl -p