IPv6 Tunnel to IPv4 A IPv6 Tunnel to IPv4 connection uses IPv4 to transmit IPv6 traffic. Overview 6to4 6to4 is a method to transmit IPv6 traffic over IPv4 networks without having to configure explicit tunnels. Overview General The general tab contains status information and settings relating to the protocol. → Read more... Advanced The advanced tab contains settings for management of advanced features for the connection. → Read more...