[svlug] running snort behind a firewall

Paul Jasa Paul.Jasa at qcs-us.com
Wed Mar 21 07:55:02 PST 2001

Where can one get a safe copy of snort??   does it come with man pages and
some kinda installation help??   If anyoneknows I'd appreciate it!! 

Paul Jasa

-----Original Message-----
From: Karen Shaeffer [mailto:shaeffer at got.net]
Sent: Tuesday, March 20, 2001 10:48 PM
To: Wayne Earl
Cc: svlug at svlug.org
Subject: Re: [svlug] running snort behind a firewall
Importance: High

On Tue, Mar 20, 2001 at 10:29:08PM -0800, Karen Shaeffer wrote:
> On Tue, Mar 20, 2001 at 03:01:46PM -0800, Wayne Earl wrote:
> > I've got a client that wants an IDS placed behind their firewall, which
> > protects their webserver farm. Everything behind the firewall is running
> > on switches (100baseT), and I am loathe to mirror traffic on the
> > so that a box running snort can sniff the packets.
> > 
> > I thought that I could run a hub immediately following the firewall,
> > only the snort box on it and a crossover to the main switch. Basically:
> > 
> > ______      _______
> > | fw |______| hub |----> to IDS
> > |    |      |     |----> to switch (and rest of server farm)
> > ------      -------
> > 
> > That way, all traffic is broadcast to each port in the hub, allowing the
> > IDS machine to capture it's data. And I don't have to reconfigure the
> > switches to mirror data to the port that the IDS is connected to.
> > 
> > Will this work the way I suspect it to work?
> Hi Wayne,
> You might look into the experimental ethernet bridging in 2.4.x kernels:
> Look in Configure.help:
> Frame Diverter (EXPERIMENTAL)
> Then you might be able to run snort on the bridge. How's that sound?

I'm just starting to work with snort, but looking in the source: Snort uses
libpcap, providing direct access to the datalink layer. So this should work,
and your proposed implementation should work as well. Take your pick.

 Karen Shaeffer
 Neuralscape; Santa Cruz, Ca. 95060
 shaeffer at neuralscape.com  http://www.neuralscape.com

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