Address allocation method, an address allocation system, the mobile node and the proxy node

If the mobile node has a plurality of interfaces, techniques for transferring to the mobile node by switching the packet transfer destination address of the mobile node in the local mobility domain is disclosed, according to the technique, MN 101 is plural IF1010 , IF1010,1011 from a network via the 1011, receives network information 40 including a domain ID 402, when IF1010,1011 based on the domain ID 402 in the received network information is determined to be connected to the same domain 11 to decide to allocate the same address to request to bind the same address to each link identifier of IF1010,1011 respect MAG111,112 that IF1010,1011 are connected respectively, AG111,112 is to binding based on the request and forwards the packets of the same address of MN101 to MN101.