Patent ID: 7949742
Filing Date: 2011-05-24
Classification: H04L

Abstract:
1. A host for accessing Internet via a router for connecting each host and the Internet through an accessing communication path of a provider, the host comprising: a processor; a generation unit configured to execute on the processor to generate one or a plurality of first type IP addresses and one or a plurality of second type IP addresses, respectively according to first type prefixes and second type prefixes that have shorter valid periods than the first type prefixes, which are advertised from the router in an identical link; a management unit configured to manage the first type IP addresses and the second type IP addresses generated by the generation unit, and valid periods of the first type IP addresses and the second type IP addresses that are determined according to latest information regarding valid periods of the first type prefixes from which the first type IP addresses are generated and latest information regarding valid periods of the second type prefixes from which the second type IP addresses are generated, which are advertised from the router; and a selection unit configured to select one IP address to be used as a source address of the each host from the first type IP addresses and the second type IP addresses that are still within said one or the plurality of second associated valid periods, at a start of communications by the host.