modprobe ipv6
ip tunnel add 6to4 mode sit local 66.92.234.252 remote any
ip link set 6to4 up
ip link set mtu 1280 dev 6to4
ip tunnel change 6to4 ttl 64
ip -6 addr add 2002:425c:eafc::1/16 dev 6to4
#ip -6 ro add default via ::192.88.99.1 dev 6to4
ip -6 route add default via 2002:c058:6301::1 dev 6to4 metric 1