Ethereal-users: Re: [Ethereal-users] Can not see vlan tag information with Ethereal

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From: Sake Blok <sake@xxxxxxxxxx>
Date: Tue, 28 Feb 2006 17:49:30 +0100
On Tue, Feb 28, 2006 at 10:59:27AM -0500, Peter Wong wrote:
> > 
> > I tried to captured the vlan tag information sent from an IP phone which connected to the same hub with my PC running Ethereal. I set up the capture filter with the ip.addr==ip of the ip phone. Ethereal can capture everything else from the IP Phone except vlan tag information. The NIC that I used on the PC is 3Com 3C918 Integrated Fast Ethernet Controller (3C905B-TX Compactible). Is there anything that I missed in set up of the Ethereal? Or do you have any idea where the problem is?
> > 

Basically, this is a driver problem, it strips the 802.1Q tags 
from the frame before passing it to higher protocols.

Please have a look at http://wiki.ethereal.com/CaptureSetup/VLAN
This helped me in getting the 802.1Q tags to be shown in ethereal.
(My laptop has broadcom hardware, but I believe there is also info
for 3com hardware on that page.)


Cheers,   Sake