intel card one interface goes offline if forcing to 100/full

Victor Padro vpadro at
Wed Mar 11 15:27:04 UTC 2009

On Wed, Mar 11, 2009 at 6:54 AM, Brian McKee <brian.mckee at> wrote:

> On Tue, Mar 10, 2009 at 8:33 PM, Asif Iqbal <vadud3 at> wrote:
> > On Tue, Mar 10, 2009 at 8:16 PM, Gregory Zill <gregory at> wrote:
> >> The two switches' respective ports connecting to the dual-port card
> >> may not be set identically, forced to the necessary 100/full, I
> >> suspect.
> >>> I noticed my intel card has two port connected to two different
> >>> network through two different switches. I were able to force the eth2
> >>> to 100/full using ethtool. However eth3 (the second interface)
> >>> disables as shown in `Link detected:' when forcing it to 100/full
> >
> > I had my network engr guy check that and  they are both set to
> > 100/full. That is why
> > I think it is very odd
> Any chance you can reverse them and see if the behaviour follows the
> switch port/cables or the eth card ports?
> And/or try a new cable on a known good std switch or even a passing
> laptop etc....
> Brian
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Have you plugged the cable to the switch which runs the command correctly?
I mean plug the cord into the switch which eth0 and eth1 are plugged in and
type in terminal "ethtool -s eth3 speed 100 duplex full autoneg off" and see
what happens.


"It is human nature to think wisely and act in an absurd fashion."

"Todo el desorden del mundo proviene de las profesiones mal o mediocremente
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