Methods and apparatus for interconnecting local area networks with wide area backbone networks.

The system of interconnection of separated local area network, and aid of by the network layer device of Wide area network via the connection and generating is connected with a WAN network access point of Wide area network, and device of then data frame is sending set is a a network layer operation through Wide area network. Specifically talk-back, the LAN network combinations for enhanced address the top representative's searching team; the connection request of network AND/OR initial the can be broadcast and a responded, so that the number of a a data-path connection. The system with an existing the connection flexible of routing selector, simultaneously with prior communicated with low overhead messages.