Stateful failover protection among routers that provide load sharing using network address translation (LSNAT)

  • US 7,139,926 B1
  • Filed: 08/30/2002
  • Issued: 11/21/2006
  • Est. Priority Date: 08/30/2002
  • Status: Active Grant
First Claim
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1. A method for providing stateful failover protection between first and second routers, wherein said first and second routers provide load sharing among multiple servers in a server farm using network address translation, said method comprising:

  • establishing, at the first router, session bindings between clients and the servers in the server farm;

    establishing, at the second router, session bindings between clients and servers in a server farm;

    at the first router, performing load sharing using Internet Protocol (IP) network address translation (LSNAT) between the clients and the servers in the server farm;

    at the second router, performing LSNAT between the clients and the servers in the server farm;

    exchanging session bindings between the first and second routers; and

    utilizing the exchanged session bindings at the first router to continue to perform LSNAT for session bindings that were established by the second router in the event of a failure of said second router;

    orutilizing the exchanged session bindings at the second router to continue to perform LSNAT for session bindings that were established by the first router in the event of a failure of said first router.

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