| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a system in which mobile VPN services are safely and seamlessly provided inside and outside an enterprise network without changing a private address assigned on the enterprise network or the like. <P>SOLUTION: A home agent (HA) is endowed with a gateway function having a security function of the enterprise network. A VPN is established beforehand between the home agent arranged in a communications carrier and a security gateway within the enterprise network, when a service contract is made between the communications carrier and the enterprise. As a result, co-located mode of a mobile node (MN) is used, and VPN information according to a security level of a network that accommodates the mobile node is distributed in a location registration procedure of a mobile IP, so that a VPN that effectively uses a tunnel set-up process of the mobile IP is configured. <P>COPYRIGHT: (C)2004,JPO</p> |
