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Re: Bridging as sniffing method?
From: "Bojan Zdrnja" <bojan.zdrnja () gmail com>
Date: Mon, 8 May 2006 16:38:19 +1200

Hi Rob,

On 5/8/06, Rob Mason <rob () cissp org uk> wrote:
Of these, I'm inclined to go with span ports or the network tap as the
best solution.  However, bridging intrigues me.  Has anyone on the list
had any experience (good or bad) with establishing a bridge to sniff
switched LAN traffic?  I've tested out a working config using FreeBSD
with two NICs and it appears to work OK, but I'm not confident of the
robustness or integrity of the bridge - any advice would be most
appreciated...

Span ports will be the easiest solution, provided that you have access
to the switch(es), of course. Keep in mind that if the network traffic
is very high that you will start loosing packets (as you will span all
other ports to this one).

I've been using OpenBSD firewalls in bridging mode for years and there
were absolutely no problems regarding robustness or integrity, and
those firewalls worked on some heavily utilized networks.

Cheers,

Bojan

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