Re: VLAN MTU Problem?

On Fri, 25 Mar 2005 19:08:30 +0100, Peter Stuge <[email protected]> wrote:
> On Fri, Mar 25, 2005 at 08:06:29AM -0800, Derek Fedel wrote:
> > Hi All,
> >
> > I'm experiencing this strange issue where I can send an email fine
> > from either VLAN as long as its text only, no attachment, but when I
> > try to send with an attachment, it just hangs the email server process
> > (qmail-smtpd in this case). Is this something that may be caused by an
> > MTU problem?
> 
> Everyone calls it an MTU problem but it has nothing to do with
> transmission and everything to do with reception. The NIC/driver
> combination you're using cannot receive fullsize tagged packets.
> (since they are up to four bytes larger than the plain ethernet spec
> maximum)
> 
> 

Sorry if I misnomered.

> > I've got a RealTek 8100 series card and a eepro100 as my
> > two VLAN interfaces, and this phenomenon doesnt occur at an office
> > that we don't have VLANs.
> 
> Make sure you're using the e100 driver rather than the eepro100
> driver for the Intel card.
> 
Actually, I am using the e100 driver. Not quite sure why I referred to
it that way. Anyway, I'm replacing both of those cards with Fa311's
(natsemi) and I'm almost positive that the natsemi driver has large
packet handling.


> //Peter
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