bugtraq - Re: recursive DNS servers DDoS as a growing DDoS problem

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Message-ID: <441B5636.8000306@tenebras.com>
Date: Fri, 17 Mar 2006 16:37:10 -0800
From: Michael Sierchio <kudzu@...ebras.com>
To: bugtraq@...urityfocus.com
Subject: Re: recursive DNS servers DDoS as a growing DDoS problem


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.