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Date: Sun, 3 Jun 2007 13:43:57 -0400
From: Javier Henderson <javier@kjsl.com>
To: r17fbsd@xxiii.com
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Cc: Pang <freebsd@laws.ms>, freebsd-questions@freebsd.org
Subject: Re: Switching between half-duplex and full duplex
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On Sun, 03 Jun 2007 11:46:15 -0400, r17fbsd@xxiii.com wrote:
> At 07:01 AM 6/3/2007, you wrote:
>>  I have just installed FreeBSD and found that the nic em0 is set to 
>> half-duplex only. Could anyone tell me how I can switch it to 
>> full-duplex?
>>        media: Ethernet autoselect (10baseT/UTP <half-duplex>)
> 
> You should be more concerned that it is only at 10Mb.  I'm not sure 
> if the old 10bT protocol even supported full duplex.  You definitely 
> need a switch rather than hub to run full duplex, and 100Mb or better 
> may also be required.  Once you have that it should auto-detect and 
> enable full duplex, if your other hardware is capable.

Auto-negotiation will work only if the other end (ie, the switch) is set to auto-negotiate. Otherwise the FreeBSD host will set itself to half duplex.

-jav