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Re: recursive DNS servers DDoS as a growing DDoS problem

Subject: Re: recursive DNS servers DDoS as a growing DDoS problem
Date: Fri, 17 Mar 2006 16:37:10 -0800
Robert Story wrote:

VG> In the scenario you describe, I cannot see any actual amplification...

The amplification isn't in the number of hosts responding, but in packet size.
A very small DNS request packet results in a huge response packet.

Are you talking about rogue authoritative servers? Otherwise, responses will be limited to 512 bytes, possibly with the truncation bit set.


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