Patent ID: 7450544

Claim:
A method of communication for a mobile node, the method comprising: moving a mobile node from a first subnetwork to a second subnetwork, the first and second subnetworks being subnetworks in a wireless local area network, the first and second subnetworks being networked to each other through the Internet, the first subnetwork being assigned a first Internet protocol address, the second subnetwork being assigned a second Internet protocol address different from the first Internet protocol address; broadcasting a first message from a second mobile access server of the second subnetwork, the first message including a medium access control address of the mobile node; acquiring an address of the second mobile access server from the first message, said acquiring being performed by a first mobile access server of the first subnetwork; transmitting a second message from the first mobile access server to the second mobile access server in response to the first message, the second message including an address of the first mobile access server and an Internet protocol address of the mobile node; and when the mobile node is in the second subnetwork, routing first data from the mobile node through the second mobile access server and then through the first mobile access server.