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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Roland Smith <rsmith@xs4all.nl>
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Cc: freebsd-questions@freebsd.org
Subject: Re: send performance of rl(4)
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>>
>> it may be problem with autoconfiguration of speed and half/full duplex.
>> try setting it manually on one or both sides.
>
> Both were showing 100baseTX full-duplex on autoselect. Setting both
> manually with 'ifconfig [rl1|xl0] media 100baseTX mediaopt full-duplex'
> didn't improve things.

try half-duplex, then other cable, then other card.

>
>> it's unfortunately common
>
> :-(
>
> Would swapping the rl(4) card with a xl(4) card help? I've got one in my
it may.

but one of the cards or the cable is bad.

on short cables when one pin does not contact it MAY work, just like that 
:)