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Method and device for filtering transmission

  • US 5,959,976 A
  • Filed: 12/09/1996
  • Issued: 09/28/1999
  • Est. Priority Date: 12/09/1996
  • Status: Expired due to Term
First Claim
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1. A method for filtering transmission addresses in Ethernet for determining whether a packet is allowed to pass or is blocked between two network groups, comprising:

  • a step for extracting source address data and destination address data from said packet formed in every network group through an extractor;

    a step for compressing said source address data and said destination address data extracted from every network group to source address data and destination address data with a small quantity of bits, namely, compressed source address data and compressed destination address data respectively;

    a step for setting compressed source address data corresponding to said source address data with a small quantity of bits to be a setup signal for writing said compressed source address data into a memory address and setting a corresponding memory address to be an effective flag;

    a step for setting compressed destination address data corresponding to said destination address data with a small quantity of bits to be a read signal for reading out said compressed destination address data from a memory address and reading out a state of said effective flag; and

    a step for determining whether said packet is allowed to pass or is blocked according to said state of said effective flag.

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