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To: Bryan Buecking <bryan@vanten.com>
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From: Lowell Gilbert <freebsd-stable-local@be-well.ilk.org>
Date: 26 Aug 2005 09:50:41 -0400
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Cc: freebsd-stable@freebsd.org
Subject: Re: CVSup timeout
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Bryan Buecking <bryan@vanten.com> writes:

> Chris Demers wrote:
> > I have run into this myself in my own home network, what I have
> > found that fixed it is I just adjusted the MTU on all my stations
> > with problems to the size of the pppoe packet size.  From the error
> > try changing it to in your case 1454 and see if the error goes away.
> >
> Thanks, that did it.  I tried adjusting my MTU before, but did not
> consider the MTU of the FW; which happens to be set to 1450.  So
> setting the MTU of problematic machine to 1450, and not 1454, fixed my
> issues.
> 
> I guess the only other point worth mentioning is the fact that with
> fbsd 4.11 works fine with an MTU of 1500.  I'm not sure, but could
> this have something to do with DF bit not being set correctly?

Possible, but it may be more likely that a firewall is
improperly dropping ICMP messages to break MTU discovery.