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Date: Mon, 28 Nov 2011 15:42:40 -0800
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From: David Brodbeck <gull@gull.us>
To: freebsd-questions@freebsd.org
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Subject: Re: diagnosing packetloss: x-files edition
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On Mon, Nov 28, 2011 at 5:15 AM, Kees Jan Koster <kjkoster@gmail.com> wrote:
> * Anything else?

Duplex mismatch?  Often causes problems where small packets go through
and large ones get silently dropped, or packets only get silently
dropped when the LAN is busy. The usual symptom is excessive
collisions (especially late collisions) logged on the device that's
set half-duplex, and no collisions logged on the device that's set
full duplex.