IDS mailing list archives

RE: Sniffing split connections


From: "Geff Ambrose" <Geff.Ambrose () networkengines com>
Date: Wed, 13 Apr 2005 14:45:28 -0400

Chris
A question for you, the handoff from the ATM switch is it Ethernet or ATM?  If it is Ethernet you should check out a 
company called Top Layer networks, they have a product called the IDS Balancer that plays well in asymmetric 
environments and will reassemble the traffic flows for you.  your snort boxes will see both sides of the traffic and 
you can then load balance to a bunch of sensors

www.toplayer.com 

Geff


-----Original Message-----
From: Chris Mills [mailto:securinate () gmail com]
Sent: Monday, April 11, 2005 12:37 PM
To: focus-ids () securityfocus com
Subject: Sniffing split connections


Hi all-

Here's the problem I'm having:

I have a client site that has two physical connections from its ATM
switch that connect to two different providers. The ATM switch uses
both connections all the time (not set up as a failover.) The ATM
switch at the site will not let me mirror the ports so I can't sniff
there... and after the two providers, the connection is too fast for
my equipment. I am using Snort 2.3.2 on PowerEdge 1750's. If I place a
sniffer at both provider A and provider B, is there a way I can
reassemble the traffic so I can see complete sessions? The two
providers are on different sides of town.

               |--------|PROVIDER A|\
Client Site|                          |-----------|INTERNET|
               |--------|PROVIDER B|/

Thanks very much,

Chris

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--------------------------------------------------------------------------
Stop hurting your network!

The NeVO passive vulnerability sensor continuously finds vulnerabilities,
applications and new hosts without the need for network scanning.
It also finds compromised systems with application-based intrusion detection.
Go to http://www.tenablesecurity.com/products/nevo.shtml to learn more.
--------------------------------------------------------------------------


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