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Method and apparatus for determining a protocol type on a network connection using error detection values stored within internetworking devices

  • US 6,105,068 A
  • Filed: 02/10/1998
  • Issued: 08/15/2000
  • Est. Priority Date: 02/10/1998
  • Status: Expired due to Term
First Claim
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1. In an internetworking device connecting a first computer network to a second computer network with a plurality of communication links, the plurality of communication links using a plurality of network protocols for communications, a method of determining a network protocol being used over a communication link, the method comprising the following steps:

  • maintaining a protocol table on the internetworking device, the protocol table having a listing of error detection codes to identify selected ones of the plurality of network protocols wherein the error detection codes are generated by a predetermined error detection process;

    receiving an initial selection input on the internetworking device over a communication link, wherein the initial selection input includes a desired type of communication to be used on the communication link;

    selecting an error detection process using the selection input, wherein the error detection process is used to identify a network protocol being used on the communication link;

    receiving N-number of data frames over the communication link with a data-link protocol associated with a network protocol;

    calculating with the selected error detection process, error detection values for the N-number of data frames; and

    identifying a network protocol being used on the communication link using the calculated error detection values for the data-link protocol data frames and the protocol table.

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