netdev - Re: Linux, tcpdump and vlan

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Message-ID: <m38x9cbdo6.fsf@maximus.localdomain>
Date:	Thu, 19 Jul 2007 17:45:13 +0200
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	Patrick McHardy <kaber@...sh.net>,
	andrei radulescu-banu <iubica2@...oo.com>,
	linux-kernel@...r.kernel.org,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: Linux, tcpdump and vlan

Stephen Hemminger <shemminger@...ux-foundation.org> writes:

> Not at runtime, acceleration is always on if you compile kernel with vlan
> support.  That is a design mistake as far as I can tell.

I think so.

>> However seeing unknown tags on master device (with tcpdump etc)
>> would certainly be useful.
>
> Only in promiscuous mode. In some sense tag is part of the mac address.

Well, in "some sense" maybe, though the MAC address is rather
strictly defined to be a 6-octet value. I can live with
promiscous anyway, it's really minor issue.
-- 
Krzysztof Halasa
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