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Date: Mon, 04 Sep 2006 17:10:49 -1000
To: "Sam Wun" <smw2010@gmail.com>, freebsd-net@freebsd.org
From: David Cornejo <dave@dogwood.com>
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Subject: Re: half-duplex
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At 04:18 PM 9/4/2006, Sam Wun wrote:
>Hi,
>
>I am running a FreeBSD 5.4 stable as a network router.
>I don't know any reason why one of the ethernet ports becomes half-duplex.
>Here is its detail:
>
>em1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>        options=b<RXCSUM,TXCSUM,VLAN_MTU>
>        inet 60.1.2.3 netmask 0xfffffffc broadcast 220.233.99.39
>        ether 00:04:23:bc:3a:d1
>        media: Ethernet autoselect (10baseT/UTP <half-duplex>)
>        status: active
>em2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>        options=b<RXCSUM,TXCSUM,VLAN_MTU>
>        inet 10.1.10.1 netmask 0xffffff00 broadcast 10.1.10.255
>        ether 00:04:23:bc:3a:d2
>        media: Ethernet autoselect (1000baseTX <full-duplex>)
>        status: active
>
>This network card is a Quat Port Intel card.
>Is there any way I can "reset" it to full-duplex and 1000baseT without close
>down the network connection on em1?
>I know I can use following command to change it:
>ifconfig em1 media 100baseTX mediaopt full-duplex
>
>but if this not work, it will close down the entire internet connection,
>which I try to avoid.
>
>Thanks
>S
>_______________________________________________
>freebsd-net@freebsd.org mailing list
>http://lists.freebsd.org/mailman/listinfo/freebsd-net
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Check and make sure there's nothing wrong with what it's connected 
to.  It's also possible the auto detection is having problems.

To force the adapter use this command:

ifconfig em0 media 1000baseTX mediaopt full-duplex

dave c