Patent ID: 7535871

Claim:
In a router supporting Mobile IP, a method of registering a mobile node visiting a Foreign Agent with a Home Agent, the method comprising: receiving by the router a registration request packet from the mobile node, the registration request packet specifying a Home Address and a care-of address; determining from the registration request packet whether the router includes the Foreign Agent that the mobile node is visiting by ascertaining whether the care-of address specified in the registration request packet is equivalent to an address of the router; determining from the registration request packet whether the router includes the Home Agent with which the mobile node is registering; if it is determined from the registration request packet that the router includes the Foreign Agent the mobile node is visiting and the Home Agent with which the mobile node is registering, registering the mobile node visiting the Foreign Agent of the router with the Home Agent of the router; receiving a packet addressed to the Home Address of the mobile node from a corresponding node by the Home Agent of the router; and forwarding the packet by the Home Agent of the router to the Foreign Agent of the router via a physical interface on the router; wherein the packet received from the corresponding node does not identify the physical interface.