SOURCE ADDRESS SELECTION SYSTEM, ROUTER EQUIPMENT, COMMUNICATION NODE AND SOURCE ADDRESS SELECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a source address selection system which can use effectively a multi-home environment.;SOLUTION: A communication node N transmits a packet to a router R1. When the connectability of an ISPa corresponding to a prefix of a source address of a received packet is not confirmed, the router R1 does not transfer the packet, but informs the node N that the packet is not transferred and a prefix corresponding to the ISPa whose connectability can be confirmed. The node N converts the source address of the packet into a network address formed on the basis of the received prefix, and performs transmission again.;COPYRIGHT: (C)2004,JPO