[TriLUG] need help setting ethernet duplex on Ubuntu

[Greg Brown]

Found it.  Ubuntu had ethtool so I was able to:

sudo ethtool -s eth0 speed 100 duplex half autoneg off

and, volia.. that did the trick.  Why I did this might interest someone out
there so here it goes.

We have a Cisco 3550 set to 100/full on every 100 meg port.  No autoneg, no
nothing.  We have a UNIX server (sun starfire 240 in this case) when it
reboots the amber light on the switch goes nuts indicating collision
(impossible in full-duplex mode) and the switch port racks up a ton of CRC
errors but not collisions.   This is to be exepected as the switch doesn't
expect collisions so it racks up the jam as CRC packets.

Once the port is unplugged the server reverts back to 100/full as it should
(as it is set up in the config) and everything is normal until the next
reboot.

Strange.  I don't know why the server does this.  Wake on LAN maybe?  I
don't know but it appears that once the server goes down the card comes
alive with it's own settings of some kind that aren't reset by the config on
the server itself.  Very strange.

Greg

On 8/23/06, Andrew Ball <anball at gmail.com> wrote:
>
> Is that Sun hardware, or maybe some vendor's, like Broadcom?  Does lspci
> tell you?
>
> Peace.
> Andrew
>
> On 8/23/06, Greg Brown <gwbrown1 at gmail.com> wrote:
> >
> > I have the latest ubuntu install and I was able to set the static
> address
> > on
> > eth0 easily enough but I wasn't able to manually set the duplex.  I need
> > to
> > do this to test an error I think is coming from the Sun hardware.  Any
> > ideas?  Back to google.
> > --
> > TriLUG mailing list        :
> http://www.trilug.org/mailman/listinfo/trilug
> > TriLUG Organizational FAQ  : http://trilug.org/faq/
> > TriLUG Member Services FAQ : http://members.trilug.org/services_faq/
> >
>
>
>
> --
> =======================
> Andrew D. Ball
> anball at gmail.com
> http://filebox.vt.edu/~anball1/
> "Festina lente" $\approx$ "Make haste slowly"
>     -- Caesar Augustus
> --
> TriLUG mailing list        : http://www.trilug.org/mailman/listinfo/trilug
> TriLUG Organizational FAQ  : http://trilug.org/faq/
> TriLUG Member Services FAQ : http://members.trilug.org/services_faq/
>