From owner-freebsd-questions  Tue Oct 10 11:19: 2 2000
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From: Mike Meyer <mwm@mired.org>
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Date: Tue, 10 Oct 2000 13:18:53 -0500 (CDT)
To: Alfred Perlstein <bright@wintelcom.net>
Cc: questions@freebsd.org
Subject: Re: ethernet config (Was: Network trickles ......)
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Alfred Perlstein writes:
> * Mike Meyer <mwm@mired.org> [001010 10:09] wrote:
> > Alfred Perlstein writes:
> > > The most switches can auto-negotiate so that if you're set up
> > > incorrectly you should be ok, however the real killer is trying to
> > > use full-duplex on a hub, which never seems to work.
> > What's the failure in that case? Just slow? Or something deadly?
> Degraded performance, ranging from packetloss to being unable to
> achieve any sort of packet transmission/recieving.

Ok, now I'm realy confused. I think I'm seeing about the same
performance through an LinkSys Etherfast hub/router box as I was with
an X-over cable before (~1.2MBytes/sec). On the other hand, I'm
willing to try anything that might improve performance. The ifconfig
output for one of the interfaces is:

dc0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 192.168.1.130 netmask 0xffffff00 broadcast 192.168.1.255
        ether 00:d0:09:fc:5a:e6 
        media: autoselect (100baseTX <full-duplex>) status: active
        supported media: autoselect 100baseTX <full-duplex> 100baseTX 10baseT/UTP <full-duplex> 10baseT/UTP none

The "media:" line looks to me like the card is running 100baseTX in
full duplex mode. The man page for the xl claims that the only media
option is "full-duplex", and without it the interface runs in half
duplex mode. The rc.conf line for the interface just sets the inet
address & netmask; nothing else gets done. Trying to set the media
options while the system running doesn't change the ifconfig
output. Adding "-mediaopt full-duplex" to the rc.conf file and
rebooting doesn't change it either.

So either 1) I'm misreading the line, or 2) I need to be told how to
set the interface to half-duplex, as the man page is wrong.

	Thanx,
	<mike



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