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Firewall apparatus and method of controlling network data packet traffic between internal and external networks

  • US 20020016826A1
  • Filed: 07/16/2001
  • Published: 02/07/2002
  • Est. Priority Date: 07/02/1998
  • Status: Abandoned Application
First Claim
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1. A firewall (3), controlling network data packet traffic between internal and external networks (1,5,4), comprising filtering means, in dependence of the contents in data fields of a data packet being transmitted between said networks, selecting from a total set of rules a rule applicable to the data packet, whereby said packet is blocked or forwarded through the firewall (3), characterized by 2-dimensional address lookup means (8) performing a 2-dimensional lookup of the source and destination addresses of the packet in a set of address prefixes, each prefix having a subset of rules of the total set of rules, in order to find a prefix associated with said source and destination addresses, and rule matching means (10), performing—

  • based on the contents of said data fields—

    a rule matching in order to find the rule applicable to the data packet.

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