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ROUTING CONTROL METHOD AND SYSTEM

  • US 20090046729A1
  • Filed: 08/14/2008
  • Published: 02/19/2009
  • Est. Priority Date: 08/17/2007
  • Status: Active Grant
First Claim
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1. A packet routing control method, wherein a local network in which a plurality of terminal devices exist and a remote network in which a VPN server and a file server exist are VPN-connected includes the following processes;

  • a terminal device is designated as a gateway among the plurality of terminal devices, the gateway terminal device receives a VPN address assigned to a specific terminal device from the VPN server and provides the VPN address to the specific terminal device;

    the VPN server receives packets whose transmission source address is a VPN address and destination address is an IP address of a file server by way of the gateway terminal device and then transfers these addresses to the file server;

    after the packet is transferred to the file server, the VPN server receives packets from the file server whose transmission source address is the IP address of the file server, and whose destination address is one or more of the VPN addresses;

    the VPN server encapsulates the packets by applying a header whose transmission source addresses are the IP addresses of the VPN server and destination addresses are global addresses of the gateway terminal device and at least one other terminal device not designated as the gateway terminal device;

    the VPN server distributes the encapsulated packets to the gateway terminal device and the another terminal device according to global addresses which are destination addresses of headers of the packets;

    the gateway terminal device and the another terminal device decapsulate the distributing packet;

    then, the plurality of terminal devices transmit the encapsulated packets to the specific terminal device according to the VPN address which is the destination address of headers of the packets.

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