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Bridging as sniffing method?
From: Rob Mason <rob () cissp org uk>
Date: Sun, 7 May 2006 20:43:14 +0100


I'm currently looking at sampling network traffic using snort and
ethereal.  My problem is that the network in question is predominantly
switched ethernet.  I have considered a number of switched network
sniffing methods:

1. Configuring a span ports on selected switches.
2. Purchase an aggregating network tap.
3. Use ARP poisoning to redirect and route traffic through my lappy.
4. Setup my pentest laptop as a network bridge.

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


Rob Mason

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