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Date:	Thu, 02 Feb 2012 13:53:37 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Benny Amorsen <benny+usenet@...rsen.dk>
Cc:	yao zhao <yao.development@...il.com>,
	Leonardo Uzcudun <uzcudunl@...oo.it>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: VLAN 1 - Native

Le jeudi 02 février 2012 à 13:10 +0100, Benny Amorsen a écrit :
> Eric Dumazet <eric.dumazet@...il.com> writes:
> 
> > There is no ID reserved to untagged traffic in the 802.1Q specs, since
> > by definition, if traffic is untagged, there is _no_ VLAN tag in the
> > frame.
> 
> This is not entirely true. If you want to send 802.1p-tagged packets
> without a specific VLAN, you should use the 0 tag. I would say that
> comes quite close to "The ID reserved to untagged traffic is 0".
> 
> It is, however, not 1.
> 

There is a big confusion on the subject and terminology


_IF_ a 802.1Q Header is present in a frame, VID is a 12 bits field.
In the standard, only 0x000 and 0xFFF are reserved. Not 1.
On linux you can still use the full range, if you really want.

_IF_ no 802.1Q header is present, there is no VLAN id included in the
frame. This is what I called "Untagged"


To send a frame without 802.1Q header on linux, use the undelying
device, eth0.

Dont expect eth0.XXX to send a frame without 802.1Q header, since
eth0.XXX is _requested_ to send a 802.1Q header.




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