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Method, apparatus and computer program product for a network firewall

  • US 7,823,195 B1
  • Filed: 08/20/2007
  • Issued: 10/26/2010
  • Est. Priority Date: 04/01/1999
  • Status: Expired due to Fees
First Claim
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1. A method of screening data units, performed by a network device, the method comprising:

  • first filtering, by the network device and using a first set of rules that correspond to first criteria, data units based on first information in the data units corresponding to the first criteria to determine ones of the first-filtered data units to be denied or allowed;

    generating, by the network device and based on second information from at least one of the allowed first-filtered data units, a second set of rules that corresponds to second criteria; and

    second filtering, by the network device and using the second set of rules, denied first-filtered data units based on second information in the denied first-filtered data units corresponding to the second criteria.

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