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This post from yesterdays internet storm center diary is worth a mention, the concept is very simple and very clever; the attack spoofs a recursive DNS query which has a short request and a long response, i.e. the amount of data sent in the reply from the DNS server is greater than the attacker sends to initiate the attack; the long response is sent to a spoofed victim ip address who get's hammered!

rgds,

Nick

 
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