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Date: Tue, 23 Nov 2004 08:37:40 +0100
From: Jeremie Le Hen <jeremie@le-hen.org>
To: Iasen Kostov <tbyte@OTEL.net>
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cc: freebsd-hackers@freebsd.org
Subject: Re: setting promisc mode kills vlans on devices with hwtagging (em,
	re ...)
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> if you setup a vlan devices with parent one of emX or reX (this what I 
> have at the moment)
> which has hardware vlan tagging just try to run tcpdump (without -p) and 
> the vlans will
> die :). That doesn't happen with parent devices not supporting 
> hwtagging. And this totally
> excludes possibility to run a bridge over vlans with parent device which 
> support hwtaggs.
> And something else was observed with re driver - it is impossible to 
> disable hwtaggs by
> -vlanhwtag neither you can disable vlan mtu :).

I believe this has been fixed by Robert Watson one week ago, at least
for the em(4) driver.  I don't know anything about re(4).

http://docs.freebsd.org/cgi/getmsg.cgi?fetch=291393+0+archive/2004/cvs-all/20041121.cvs-all

Regards,
-- 
Jeremie Le Hen
jeremie@le-hen.org