Patent ID: 8238363

Claim:
A Foreign Home Agent (FHA), comprising: a registration management module; and a routing management module; wherein the registration management module is configured to provide a mobile node (MN) with information about an IPv4 address and an IPv6 address of the FHA, and information about a Temporary Home Address (THOA) assigned for the MN by the FHA and information about an IPv6 Care of Address (COA) corresponding to the THOA, accept the MN to register the information about the THOA and information about an IPv4 COA acquired from a Foreign Agent (FA) in the FHA, and register the IPv6 COA corresponding to the THOA in a Corresponding Node (CN) or a Home Agent (HA); and wherein the routing management module is configured to: de-capsulate a first IPv4 packet to be sent from the MN to the HA, or the CN, into a first IPv6 packet; send the first IPv6 packet to the HA or CN; encapsulate a second IPv6 packet to be sent from the HA or CN to the MN into a second IPv4 packet and send the second IPv4 packet to the MN according to relationship between the IPv4 COA and the THOA.