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Tag echo discovery protocol to detect reachability of clients

  • US 6,694,369 B1
  • Filed: 03/30/2000
  • Issued: 02/17/2004
  • Est. Priority Date: 03/30/2000
  • Status: Expired due to Term
First Claim
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1. In a server computer comprising a processor, a memory, said server computer communicatively coupled to a plurality of client computers in a network, a method for detecting reachability of client computers comprising:

  • storing a first reachability file comprising a plurality of records, wherein each record indicates a status of each “

    compliant”

    client computer;

    storing a second reachability file comprising a plurality of records, wherein each record indicates a status of each “

    non-compliant”

    client computer generating a first data packet with an I.C.M.P. packet for a data payload;

    selecting a first identifier tag from among a select plurality of identifier tags stored within said first reachability file or said second rechability file;

    inserting said first identifier tag into a proper data segment of said first data packet, thereby forming a first tagged ping packet;

    transmitting said first tagged ping packet to a first client computer;

    determining whether said first client computer is “

    compliant”

    or “

    non-compliant”

    from a response to said first tagged ping packet;

    moving one of said plurality of records of said first reachability file, corresponding to said first client computer, to said second reachability file if said first client computer is determined to be “

    non-compliant”

    ; and

    moving one of said plurality of records of said second reachability file, corresponding to said first client computer, to said first reachability file if said first client computer is determined to be “

    compliant”

    .

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