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Method and apparatus for protecting web sites from distributed denial-of-service attacks

  • US 20030035370A1
  • Filed: 06/19/2002
  • Published: 02/20/2003
  • Est. Priority Date: 08/16/2001
  • Status: Active Grant
First Claim
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14. A method at a border router at which a first ISP exchanges packets with a second ISP, the first ISP supporting an SPE service in which packets destined or belonging to a connection to a subscribing site are forwarded in a first, second or third class of service depending the conformance of the packet to a profile provided by the subscribing site, packets in the first class of service belonging to a connection to the subscribing site conforming to and obeying congestion-avoidance rules, packets in the second class of service destined to a subscribing site conforming to the profile and whose obedience to congestion-avoidance rules is not enforced, and packets in the third class of service not qualifying for the first or second classes of service, the second ISP not supporting the SPE service, the method comprising:

  • marking for forwarding packets arriving from the ISP that does not support the SPE service in a fourth class of service.

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