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Re: DNS Packets
From: Joel Esler <jesler () sourcefire com>
Date: Mon, 3 Jun 2013 09:46:23 -0400

On Jun 3, 2013, at 8:57 AM, Mikey van der Worp <mvdworp () utelisys com> wrote:

Hi there
 
I’ve got several rules.. But non of them are working properly..
 
“How to detect a DNS Query Reply -> OK”..
This is something i’ve created a couple of days ago… Doesn’t work as it should be.. This detects “all querys”.. Even 
when its refused…

I would take the packet capture you have and throw it into wireshark and learn which bytes in the packet you have 
indicate a "Query Reply -> OK" response, and write a rule to detect that sequence of bytes.

--
Joel Esler
Senior Research Engineer, VRT
OpenSource Community Manager
Sourcefire
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