Never force full duplex.

[Donald Becker]

On Fri, 31 Mar 2000, Cy wrote:

> I too had problems with crossovers, except that I was attempting to force
> full duplex.  Could never get it to work.  I just let autonegotiation take
> care of itself and I get full duplex like I wanted.

This is common enough that it is worth repeating:

      Never force full duplex.
      Never.  No, not then.  No, it's not a secret go-faster flag.

There is only one place where forcing full duplex is needed, and that is
when you are talking to an old or misdesigned switch that doesn't have
autonegotiation, and you cannot change the switch configuration.  If you can
change the switch configuration, change it back to half duplex and save
yourself future headaches.  You probably don't see any significant
performance improvement when using full duplex on switches without working
autonegotiation anyway.

Read
  http://cesdis.gsfc.nasa.gov/linux/misc/NWay.html
for more info on N-Way autonegotiation.

Donald Becker
Scyld Computing Corporation, becker@scyld.com

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