Re: DNS Packets

[Joel Esler <jesler () sourcefire com>]

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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