Patent ID: 7068640
Filing Date: 2006-06-27
Classification: H04L,H04W

Abstract:
1. A server apparatus provided in a home network of an IP network using a protocol that automates the management of an IP address and the transfer of a communication packet to a move destination when a mobile terminal has moved between different IP network, the server apparatus comprising: memory means that stores VPN information for constructing a safe communication path within an IP network in relation to the terminal, the VPN information containing VPN path distribution means that distributes the VPN information to a first network apparatus, a second network apparatus, and a third network apparatus at the time of transmitting an authentication response message to a position registration request message from the terminal, the first network apparatus having a security gateway function of the home network, the second network apparatus a security gateway function of the external network of a move destination, the third network apparatus having a security gateway function of a predetermined network in which a correspondent node CN with whom the terminal communicates exists, wherein the respective network apparatuses set a VPN path by the IP Sec. based on the distributed VPN information, to between the first network apparatus and the second network apparatus, between the first network apparatus and the third network apparatus, and/or between the second network apparatus and the third network apparatus respectively.