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Systems and methods of using an IP ID field for automatic WAN/LAN detection

  • US 7,664,857 B2
  • Filed: 03/12/2007
  • Issued: 02/16/2010
  • Est. Priority Date: 01/26/2007
  • Status: Active Grant
First Claim
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1. A method of a first intermediary to detect an announcement of presence of a second intermediary, the method comprising the steps of:

  • (a) transmitting, via a first intermediary, a transport layer connection request, transmission of the transport layer connection request traversing a second intermediary;

    (b) intercepting, by the first intermediary, a packet having an identification field of an internet protocol layer header encoded with a value established by the second intermediary, the value established by the second intermediary by performing a predetermined operation on an initial sequence number for the transport layer connection; and

    (c) detecting, by the first intermediary, presence of the second intermediary by determining the value of the identification field of the internet protocol layer header of the intercepted packet comprises the initial sequence number for the transport layer connection encoded by the predetermined operation.

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