Wireshark · Ethereal-users: Re: [Ethereal-users] Regarding 802.1q

[Scott Lowrey <slowrey@xxxxxxxxxxx>]

Guy Harris wrote:

> Scott Lowrey wrote:
>
> > I know the Intel PRO is VLAN capable but I'm not sure about Windows, 
> > and even if you do get the packets,  you may not see the tags.  See 
> > http://wiki.ethereal.com/CaptureSetup_2fVLAN for more info.
> > I'll update the Linux section...
>
>
> Does the Linux driver support an option similar to the Windows driver 
> for the Intel card, to pass the VLAN tags up (either always, or in 
> promiscuous mode)?
VLAN "filtering" is supported by the Intel hardware and is 
configurable.   The driver seems to have this enabled by default, 
therefore the tags are being stripped before being passed up. 

A search of the mail archives at http://sourceforge.net/projects/e1000 
indicates that filtering can be disabled.  Indeed, the most current 
driver has the disabling code included but only for a specific chip 
type.  Not sure why that is.

I'd like to find out if there is a non-invasive (ethtool?) way to 
disable this filtering but unfortunately I have other things going on at 
the moment....  :-|

-
*Scott Lowrey*
Test Engineering Manager
NexTone Communications <http://nextone.com>
Gaithersburg, Maryland USA

/1.240.912.1369/