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Mobile IP communication scheme for supporting mobile computer move over different address spaces

  • US 7,586,939 B2
  • Filed: 08/02/2005
  • Issued: 09/08/2009
  • Est. Priority Date: 09/05/1997
  • Status: Expired due to Fees
First Claim
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1. A packet relay device in a network system supporting a mobile computer that is capable of carrying out communications while moving over a plurality of interconnected networks, for relaying packets having an address of the mobile computer as a destination or source, the packet relay device comprising:

  • a packet receiving unit configured to receive a packet in a first format using a global address which is transmitted by the mobile computer for a location registration at a home network from a visited site managed by a global address system which is valid throughout the interconnected networks, the packet being transmitted by using a global address of the packet relay device, and to check a content of the packet; and

    a packet transfer unit configured to transfer the packet in a second format using a private address, to a correspondent computer in the home network of the mobile computer managed by a private address system which is valid only within the home network according to the content of the packet, the packet being transferred by using a private address of the correspondent computer which is different from the packet relay device identified by the global address of the packet received by the packet receiving unit;

    wherein the packet receiving unit decrypts the packet received from the mobile computer at the visited site using a key corresponding to the mobile computer, andthe packet transfer unit re-encrypts a decrypted packet using a key corresponding to the correspondent computer, encapsulates an encrypted packet by attaching a header having a private address of the packet relay device as a source and a private address of the correspondent computer as a destination, and transfers an encapsulated packet to the correspondent computer.

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