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Handling of DDoS attacks from NAT or proxy devices

  • US 20090144806A1
  • Filed: 12/03/2007
  • Published: 06/04/2009
  • Est. Priority Date: 12/03/2007
  • Status: Active Grant
First Claim
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1. A method for authenticating communication traffic, comprising:

  • receiving an initial incoming message, sent over a network from a source address to a destination address;

    in reply to the initial incoming message, sending an outgoing message to the client containing an encoded token;

    receiving a number of further incoming messages from the source address containing the encoded token; and

    inhibiting delivery of one or more of the further incoming messages to the destination address when the number exceeds a predetermined threshold.

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