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Method and apparatus for deflecting flooding attacks

  • US 7,234,161 B1
  • Filed: 12/31/2002
  • Issued: 06/19/2007
  • Est. Priority Date: 12/31/2002
  • Status: Active Grant
First Claim
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1. Method for regulating the passage of packets between a host system and a client system in a network computing environment, said method comprising the steps of:

  • receiving a first packet from the client system, wherein said first packet contains information representative of a request for start of connection;

    recording packet information of said first packet;

    passing said first packet to the host system;

    receiving a second packet from the host system, wherein said second packet contains information representative of an acknowledgement by the host system of said request for start of connection;

    passing said second packet to the client system;

    monitoring a response by the client system to said second packet for occurrence within a timer threshold;

    sending a reset signal to the host system for shutting down a half-open connection if said response by the client system to said second packet is not received within said timer threshold;

    receiving a delayed response from the client system to said second packet after said elapse of said timer threshold; and

    raising said timer threshold to be more lenient to the client system that previously forwarded said delayed response.

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