Patent ID: 7330449

Claim:
A mobile node making up a communication system based on Internet Protocol version 6, together with a mobility control apparatus for managing movement of the mobile node, and with an access node providing a link for the mobile node to be connected to a packet communication network, the mobile node comprising: list acquiring means for acquiring a list of access nodes existing on neighboring links to the link used for connection by the mobile node; care-of address (CoA) list creating means for creating a list of CoAs corresponding to the respective access nodes entered in the acquired access node list, each CoA being used as a destination address of the mobile node at a link on which an access node corresponding thereto exists; access node address acquiring means for, where the mobile node changes the connected link to another link, acquiring a data link layer address of an access node existing on the link after the change; default router detecting means for detecting a default router on the basis of the acquired data link layer address with reference to the access node list; primary CoA detecting means for detecting a CoA with a network prefix corresponding with a subnet prefix of the default router, as a primary CoA from the list of CoAs; and path update requesting means for requesting the mobility control apparatus to update a path of a packet addressed to the mobile node, by the primary CoA.