Protection against reflection distributed denial of service attacks
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United States of America Patent
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Apr 10, 2012
Grant Date -
Jul 10, 2008
app pub date -
Jan 4, 2007
filing date -
Jan 4, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A method includes monitoring outgoing request packets transmitted by a node in a protected network over a link connecting the protected network to an external network. Incoming response packets that originate in the external network and are destined for transmission to the node are also monitored. One or more of the incoming response packets that were not solicited by any of the outgoing request packets are identified responsively to monitoring the outgoing request packets and the incoming response packets. A characteristic that differentiates between the identified incoming response packets and the incoming response packets that were solicited by the outgoing request packets is determined. A guard device in the external network is instructed to inhibit the transmission over the link of subsequent unsolicited response packets based on the characteristic.
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