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Re: Snort stateless/asymmetric mode
From: James Lay <jlay () slave-tothe-box net>
Date: Wed, 8 May 2013 20:04:34 -0600

I do work with a company that has multiple paths out, so I think I know where you're at.  Solution was/is to have a 
single machine with multiple nics, have each path's get a spanned port, and then use daq to listen to all the each 
interface in each path.  Bonus was that one instance of snort handles all external traffic, no matter which path it 
comes/goes.  Hope that sorta helps.

James

On May 8, 2013, at 2:16 PM, Rodolfo Etore <rponteado () gmail com> wrote:

Hello, thanks for your quickly response here,



2013/5/8 James Lay <jlay () slave-tothe-box net>
On 2013-05-08 12:54, Rodolfo Etore wrote:
Hello all,

Can you please help me with the following situation:

I have two sensors, our network team created a portchannel to connect
both sensors on the same network, and now the situation we are facing
is this, the traffic comes into one sensor and gets out trough the
order sensor, this way snort is not matching any rules, so i would
like to check with you if there is an way so we can inspect the
traffic in some sort of stateless mode, because it only matches when
traffic gets out in the same sensor it got in.

Many thanks for your help.


By sensor are you meaning a different machine/snort instance/interface?
Could you describe it in a litter more detail?

A sensor is basically a machine, and each machine has one bridge with one snort instance running. The two machines 
have the very same configuration.
What happens is that in some situations we have the inbound packets trough one machine and the outbound packets 
trough the second machine, as mentioned early this way snort signature are not matching. 

James

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-- 
Muito obrigado desde já
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their applications. This 200-page book is written by three acclaimed 
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------------------------------------------------------------------------------
Learn Graph Databases - Download FREE O'Reilly Book
"Graph Databases" is the definitive new guide to graph databases and 
their applications. This 200-page book is written by three acclaimed 
leaders in the field. The early access version is available now. 
Download your free book today! http://p.sf.net/sfu/neotech_d2d_may
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