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Undetectable firewall

  • US 7,100,201 B2
  • Filed: 01/24/2002
  • Issued: 08/29/2006
  • Est. Priority Date: 01/24/2002
  • Status: Active Grant
First Claim
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1. A method of preventing unauthorized access to a computer system, comprising:

  • receiving a data packet at a firewall, where the data packet comprises a frame field, a header, a body, and a trailer;

    passively copying the data packet at the firewall, where the passive copying leaves the frame field, the header, the body, and the trailer of the data packet unchanged so that there is no indication of the firewall in the data packet;

    analyzing the passively copied data packet with the firewall to determine if the data packet is authorized to access the computer system;

    sending an authorized data packet to the computer system; and

    denying access of an unauthorized data packet to the computer system.

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