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#1 2008-09-11 06:08:35

Donki
Member
Registered: 2008-09-01
Posts: 6

Forcing Full-duplex

How do I go about forcing full-duplex?
I've tried to do it with ethtool, and it says it works, but the dmesg says nothing has changed.
Maybe it has changed but the dmesg is off?
Any clues? Is there a configuration file somewhere that I'm missing where I can for 10BaseTx-FD?

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#2 2008-09-11 06:13:49

Donki
Member
Registered: 2008-09-01
Posts: 6

Re: Forcing Full-duplex

One thing I've noticed, is that after I executed the ethtool command to force full-duplex, there have been no collisions.
Is dmesg lying to me?

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#3 2008-09-12 17:27:21

mrbug
Member
Registered: 2007-07-17
Posts: 221

Re: Forcing Full-duplex

Unless I'm remembering it incorrectly or Cisco lied to me, I'm reasonably sure that collisions can't happen in full duplex mode. I think that it has something to do with the fact that it uses two pairs of wires. (One to send, one to receive?)

If that is the case, dmesg is not lying. However, you will need to add the following line to /etc/rc.local :
ethtool duplex full

(you could also force the speed with "speed 1000" or "speed 100")


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