Patent ID: 8036640

Claim:
A method for a mobile node to route a data message formed thereat to a network by way of one of a plurality of network portions, the mobile node associated with a home network portion of the plurality of network portions, comprising: generating a registration request for the network in response to a triggering event, said registration request including an identification of the home network portion and an identification of a network portion with which the mobile node is currently in communication contact, whereby routing information is determined by the network; transmitting said generated registration request; receiving at the mobile node a response message populated by routing information from the network; extracting routing information from the received response message and storing said extracted routing information at the mobile node, said stored routing information identifying to the mobile node, for at least one network portion, an IP (Internet Protocol) address, port, and access point; and forming a data message subsequent to said storing for transmission to the network, said data message comprising said stored routing information.