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Re: RES: Sniffer - How's the best way to deploy ?
From: Lukasz Szmit <lukasz.szmit () ucd ie>
Date: Wed, 12 Jul 2006 16:29:20 +0100

On Wed, 2006-07-12 at 10:21 -0300, Ricardo Perin wrote:
I haven't sure if ethereal supports PLC network, I think not.

If PLC in this case stands for Programmable Logic Controller, than I
think the latest stable version of Ethereal has support for this sort of
traffic. I've never used it though.

Some switches have a port called PROBE PORT that is used exactly for this.
All the traffic in the network passes through him. I don't know if Cisco
call this port with other name, but....

Cisco call it a SPAN (Switched Port ANalyzer) port or a session monitor
port. Casually it's referred to as a spanned port. The 2955 does support
it: http://www.cisco.com/warp/public/473/41.html#support

Here's how to do it:

If you want to use the monitoring PC on the network, while running a
packet capture on the spanned port at the same time, then - as Francois
already mentioned - you would indeed need to NIC's. Otherwise one will

Lukasz Szmit
University College Dublin

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