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Multi-level packet screening with dynamically selected filtering criteria

  • US 6,983,323 B2
  • Filed: 08/12/2002
  • Issued: 01/03/2006
  • Est. Priority Date: 08/12/2002
  • Status: Expired due to Term
First Claim
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1. A packet filtering device, comprising:

  • a first filter applying a first filtering criteria against packet traffic to generate a first pass traffic portion and a fail traffic portion; and

    a second filter, by-passed by the first pass traffic portion, applying a second filtering criteria against the fail traffic portion to generate a second pass traffic portion and a reject traffic portion;

    wherein the first and second filtering criteria are dynamically selected during first and second filter operation to filter packet traffic.

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