| 摘要 |
A new technique is disclosed, by which it is possible to prevent the occurrence of unnecessary traffic from a mobile node when a path is switched over by path selecting policy of a home agent itself or a correspondent node itself. According to this technique, in a communication system where a mobile node 10 registers a plurality of care-of addresses at a home agent 2, which controls own home address, and the home agent transfers a packet destined to the home address to one of said plurality of care-of addresses, the home agent switches over the care-of address of transfer destination and notifies, to the mobile node, care-of address switching information containing the care-of address before the switching by a packet destined to the care-of address after the switching, and the mobile node transmits a binding update message for maintaining binding information relating to the care-of address after the switching to the home agent.
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