| 摘要 |
A communication system includes mobile IP communication apparatuses in an access service network and having proxy mobile IP client functioning units, foreign agent functioning units, and DHCP proxy functioning units, which have a common IP address. The DHCP proxy functioning unit of a first mobile IP communication apparatus, connected with a mobile station before movement, reports information about the mobile station to a second mobile IP communication apparatus connected with the mobile station after movement. The DHCP proxy functioning unit of the second mobile IP communication apparatus receives the information about the mobile station and further receives from the mobile station, an update message addressed to the common IP address, executes an IP address update process based on the information about the mobile station, and reports an update result to the proxy mobile IP client functioning unit and the foreign agent functioning unit in the second mobile IP communication apparatus.
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