PACKET COMMUNICATION DEVICE

摘要

Disclosed is a technique for detecting generation of a redundant path optimization message for an address owned by a node which already recognizes binding between a C/O address and a home address of a mobile node. According to the technique, a CN (correspondent node) (60) uses two addresses (134, 136). The MN (50) executes an optimization process of a communication path with an address (134) and transmits a BU (binding update) message (210) which registers information on a local C/O address and home address. Then, the CN inserts information at another address (136) into a BA (binding acknowledgement) message (220) and returns the message. The MN recognizes that the CN owns another address (136). When starting communication via an optimized path with the another address (136), a data packet (230) is transmitted without executing a return routability process or a BU message transmission.