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To: Vincent Zee <basics@zenzee.cistron.nl>
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From: Lowell Gilbert <freebsd-questions-local@be-well.no-ip.com>
Date: 09 Apr 2003 16:39:03 -0400
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cc: FreeBSD Questions <freebsd-questions@freebsd.org>
Subject: Re: Strange network behaviour
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Vincent Zee <basics@zenzee.cistron.nl> writes:

> I am really at a loss at the moment.
> 
> I have a 100baseT network at home and all connected machines have 100Mb 
> network cards.
> When I upload mp3 files from my ibook to the FreeBSD server the speed 
> drops to 100kb/s.
> 
> This only happens between these two particular machines. These same 
> machines connected to other machines give the expected transmission 
> speeds. I checked cables, switches and router but found nothing 
> unexpected.
> 
> Any hints, ideas or even solutions are most welcome.
> 
> The FreeBSD machine is running 4.7 and the ibook 10.2.4

This sounds a lot like a duplex mismatch. 
Check the collision count.