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Date: Mon, 05 Jan 2004 11:47:57 +0100
From: Andre Oppermann <oppermann@pipeline.ch>
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To: Jeremie LE HEN <le-hen_j@epita.fr>
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cc: Stephane Raimbault <segr@hotmail.com>
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Subject: Re: VLAN MTU problem in 4.9 ?
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Jeremie LE HEN wrote:
> 
> > I know now, that xl interface can't pass 1504 frames
> > and most 1G interfaces can
> >  don't know about another 100M interfaces
> 
> Intel EtherExpress Pro/100 also supports it.  I don't know if << Jumbo
> Frames >> are supported under FreeBSD with this network adapter, but it
> is under Linux with the driver developped by Intel (named "e100").  The
> old driver (named "eepro100") does not originally support Jumbo frames,
> but a minor modification can enable it.
> See http://www.softlab.ntua.gr/~afornaro/downloads/vlan-eepro.patch for
> more informations.

Be careful not to mix the term jumbo frames with the 4-byte addition
for VLANs.  Jumbo frames are frames which are something like 9000 bytes.

To answer your question; the Intel Etherexpress Pro/100 as it is
supported by the fxp driver accepts and sends the 4-byte VLAN enhanced
ethernet frames.

-- 
Andre