auto tun0
iface tun0 inet6 v4tunnel
        endpoint 212.100.184.146
        local 81.56.237.44
        ttl 64
        pre-up /sbin/modprobe ipv6
        up /sbin/ip link set tun0 multicast on
        up /sbin/ip -6 route add default dev tun0
        up /sbin/ip link set tun0 mtu 1280
        address 2001:6f8:202:d9::2
        netmask 128