Forcing Duplex settings

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G

Guest

Hello,

I have several computers that I need to set the Duplex setting from Auto to
Full Duplex on every NIC.

Thanks,
Kenneth
 
Hi,

Are you sure you know what you're doing, I've seen serious problems when
it's forced, even though it was matched to the switch.
 
Hi,
What kind of problems have you been experiencing when you set the NIC's to
100Full insted of Auto?

The problem I have has a long story, but the only thing that did make the
situation better was when we set the NIC to 100Full insted of Auto, the same
on the switchport.

And then we have tried almost everything, well it feels like you have tride
everything. But we switched nic's, cabels, new hardware for the computer and
new switches.

Kenneth
 
Hi Kenneth,

The problems I had, were that I thought I was being clever matching the
NIC to the switch (and it even recommends this in a manual I have), but
when I tested it, everything to do with the network was messed up. I
then put it back to "Auto" and everything started working again. I've
never worked out the reason. I basically did it on each machine manually
back then.

In terms of "how" to force the settings, I don't know. It may be a case
of hacking very specific registry keys for the NIC driver in question,
or there may be a way to use NDIS API calls, or the NIC maker may have a
developers guide or WMI provider.

You may want to post about this on the WMI newsgroups if you don't get
an answer here - although I don't think it can be done with WMI, the
guys in that group know about this kind of thing.

About your specific problem, did you try taking five clean built
machines off the network and creating a test network with just those
five? This is the first thing I'd do. You haven't exactly defined the
problem very well.
 
I'm not sure if we have tested it in an testlab enviroment.
The system is already running in production, and there is alot of resources
we need to get to do an testlab.

I'll take your tip and ask the WMI list, or atleast read the FAQ :)

Thx for the help.

Kenneth
 
Hi

We have ssen similar problems with some Intel nics, mostly motherboard
integrated on PIII:s. The problem is that at least CISCO switches and these
intel nics wan't agree om anything else than 10Mbit/half duplex. Forcing
them to 100/Full in both ends will give a stable 100/Full connection

The problem is that there is no common property to set to adjust speed and
duplex. Theese settings are implemeted by each driver vendor as they see
fit. There is a wmi value to read out the connection speed but that is read
only. Intel has wmi extension for their cards wich make them adjustable by
WMI.

I have posted a request via our tam to the develteam to change the
drivermodel so that nicspeed and duplex would become a standard interface
for all nics.

In the meanwhile the best soulution to this (at least as I know) is to edit
the registry or make a program for it. Be aware that you will have to change
diffrent keys/values depnding on the nic
 
Hi Kenneth,

Post back if you get an answer! I'd still be interested to know a short
description of the problem you are having.

Your solution is to "change the duplex settings", but how do you know
there isn't an easier or better solution, and how do you know you've got
to the bottom of the problem by this change?

Kenneth said:
Thanks,
I will ask my adapter creator if they have any WMI extentions. :)


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