This is an old revision of the document!
NOTE : change "Internal_ip" "Tunnel_broker_ip" "IPv6_ip" "IPv6_gateway_ip" with information you get from your broker
STARTMODE='onboot' BOOTPROTO='static' TUNNEL='sit' TUNNEL_LOCAL_IPADDR='Internal_ip' TUNNEL_REMOTE_IPADDR='Tunnel_broker_ip' IPADDR='IPv6_ip' TUNNEL_TTL='64'
default IPv6_gateway_ip
You should be good to go