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System and method for secure network mobility

  • US 20020066036A1
  • Filed: 11/13/2001
  • Published: 05/30/2002
  • Est. Priority Date: 11/13/2000
  • Status: Active Grant
First Claim
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1. In a computer network arrangement comprising a home network having at least one home network server and a firewall for protecting said home network server, a relay server outside of said home network, and a client having a permanent IP address within said home network, a method for maintaining secure communications between the home network server and the client when said client roams outside of said home network to a new location, said method comprising:

  • establishing a new IP address for the new client location;

    sending a registration message to said relay server identifying said new IP address location;

    authenticating said registration message;

    encapsulating and transmitting said registration message to said home server;

    registering said new IP address as a care-of-address for said client at said home server;

    confirming the registration of said new IP address with said client;

    establishing a security association between said home server and said relay server on behalf of said client;

    performing network address translation between the client'"'"'s permanent IP address and the client'"'"'s new IP address;

    tunneling packets addressed for said client between said home server and said relay server based on the established security association and said address translation for said client; and

    decapsulating said packets at said relay server and forwarding said packets to said client.

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