Abstract: A method for a mobile node's connection to a virtual private network using a mobile IP under a mobile environment is provided. According to this method, the mobile node firstly makes a mobile IP registration request message including VPN user authentication information and transmits the message to VPN gateway. Then, the VPN gateway reads the VPN user authentication information from the message and inquires a database in which VPN user authentication information is already stored, to verify a VPN access authority of the mobile node. If the access authority is verified, private IP is recorded in a response message to the mobile IP registration request message, and the response message is transmitted to the mobile node to assign the private IP. Accordingly, a VPN having low construction cost, simple topology, less network traffic and low working loads on the mobile node and the network under a mobile environment can be constructed.

Abstract: The present invention relates to a routing method for a traffic load distribution in a packet-switched network.