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System and method for protecting computer device against overload via network attack

  • US 7,069,588 B2
  • Filed: 08/29/2001
  • Issued: 06/27/2006
  • Est. Priority Date: 08/29/2001
  • Status: Active Grant
First Claim
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1. A method for use with a stateful packet processing device of a computer network for mitigating effects of a network overload against said device, said method operable to free memory used to store information about communications sessions managed by said device, said method comprising the steps of:

  • classifying session cache entries made in memory into different cache classes, according to one or more characteristics of those entries;

    determining when said device is under network overload;

    selecting session cache entries for deletion and deleting them thereby freeing associated memory when said device is under network overload;

    determining when sufficient memory has been freed, such that said cache entries are no longer deleted.

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