Wireshark-users: Re: [Wireshark-users] How to configure NIC that connects to Cisco SPAN port?
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From: Stephen Fisher <steve@xxxxxxxxxxxxxxxxxx>
Date: Mon, 9 Feb 2009 18:02:30 -0700
On Mon, Feb 09, 2009 at 04:26:57PM -0800, David Kraut wrote:

> Hi, I'm trying to find configuration information or examples of how to 
> configure the NIC of a dedicated computer that will connect to a 
> spanned/mirrored Cisco switch port.? Specifically, does the NIC need 
> an IP address if it's connected to a span port that passes?multiple 
> VLAN traffic?? Essentially, I want to mirror the port that everyone 
> must go through to get to the Internet.? This traffic will be coming 
> from many different subnets.? Any assistance would greatly 
> appreciated!?? ?

The NIC only needs to be in promiscuous mode.  No IP address needed.


Steve