Ethereal-users: Re: [Ethereal-users] Has anyone discovered a good PCMCIA NIC for Capturing 802.1

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From: "Joshua Marsh" <joshuamarsh@xxxxxxxxxxxxxx>
Date: Wed, 14 Dec 2005 10:56:29 -0700
I finally found a solution to this.  It turns out that it was the monitor session on the Catalyst 3550 that was stripping the 802.1Q tags, and not the NIC drivers like I initially suspected.  There is a CLI switch that you can add to keep the encapsulation on a monitor port on a 3550:
 
monitor session 1 source interface f0/2
monitor session 1 destination interface f0/3 encapsulation dot1q
 
Hope this helps someone else avoid being stymied for as long as I was!
Joshua