How do you check the current duplex value of a network card set to Auto negotiate in Windows?

Question

I would like to know what duplex (half or full) my network card has negotiated with a switch when they are both set to auto configuration in Windows.

score 16 · Accepted Answer · edited Oct 15 '18 at 06:14

16

At command prompt:

powershell "Get-NetAdapter | SELECT name, fullduplex | where name -eq 'card name'"

Enjoy.

edited Oct 15 '18 at 06:14

im_chc

103

answered Apr 14 '17 at 15:49

HotPlasma

176

score 11 · Answer 2 · answered Dec 22 '09 at 21:02

Without looking at the switch, the only way it seems possible is if the windows driver for your NIC reports this information. To see if it does, go to Control Panel --> Administrator Tools --> Event Viewer. You then want to look at the System logs (in Windows7 this is under the Windows Logs tree). Once you found the System logs, click on Source at the top to use as the sorting criteria. Now look for your NIC driver, mine for example is b57nd60a. Scroll through all the entries that your NIC driver has made and if you're lucky you'll see what speed it negotiated at in the event report.

score 8 · Answer 3 · answered May 08 '19 at 06:08

8

With Powershell run:

Get-NetAdapter | SELECT name, LinkSpeed, fullduplex | ft -autosize

answered May 08 '19 at 06:08

Faisal

161

score 8 · Answer 4 · edited Oct 31 '15 at 04:27

8

Type the following into command prompt:

wmic NIC where NetEnabled=true get Name, Speed

It should tell you.

edited Oct 31 '15 at 04:27

Insane

2,922

answered Oct 31 '15 at 02:15

triguts

89

score 3 · Answer 5 · answered Dec 22 '09 at 20:39

3

Some cards (Intel for example) have a diagnostic suite that shows this information. This software is often not installed. Usually just the driver is installed and the diagnostic/management app is not. I believe the Intel app is called ProSet

answered Dec 22 '09 at 20:39

Dave M

13,250

score 2 · Answer 6 · answered Oct 03 '13 at 17:38

2

This works in Windows 7, not sure about lower versions:

Right click on the network card in Network Connections in the Control Panel
Click Configure
Click the Link Speed Tab
Look at the Link status Window.

enter image description here

answered Oct 03 '13 at 17:38

David

9,854

score 0 · Answer 7 · answered Dec 07 '20 at 03:55

0

Yes it's easy to see the speed 10/100/1000Mbps, windows tells you and the LEDs tell you, the person was asking about Full/Half duplex, which can be at any connection speed 10/100/1000Mbps.

answered Dec 07 '20 at 03:55

Mick

1

js2010 · Answer 8 · 2024-08-08T01:03:51.227

This looks like the wmi class powershell get-netadapter uses, thanks to https://mctexpert.blogspot.com/2015/01/getting-nic-duplex-mode-with-powershell.html. Unfortunately, it's not available in winpe. The double backslashes are required. Can't get driverdescription property (contents too long?) or list view (/format:list needs get).

wmic /namespace:\\root\standardcimv2 path cim_networkport get name,fullduplex,speed
FullDuplex  Name                  Speed
            Ethernet 2            0
TRUE        Ethernet              1000000000
            vEthernet (Ethernet)  10000000000

Hmm driverdescription works with this path (the property order doesn't matter?):

wmic /namespace:\\root\standardcimv2 path msft_netadapter get fullduplex,driverdescription
DriverDescription                                                                 FullDuplex
Bluetooth Device (Personal Area Network)                                          TRUE
Cisco AnyConnect Secure Mobility Client Virtual Miniport Adapter for Windows x64
Intel(R) Wireless-AC 9560 160MHz                                                  FALSE
Intel(R) Ethernet Connection (7) I219-V                                           TRUE
Hyper-V Virtual Ethernet Adapter

Or in powershell:

get-wmiobject -n ROOT\StandardCimv2 CIM_NetworkPort | 
  select name,fullduplex,speed,driverdescription
name                 fullduplex       speed driverdescription

Ethernet 2                                0 Cisco AnyConnect Secure Mobility Client Virtual Miniport Adapter for Windows x64
Ethernet             True        1000000000 Intel(R) 82579LM Gigabit Network Connection
vEthernet (Ethernet)            10000000000 Hyper-V Virtual Ethernet Adapter

score -1 · Answer 9 · answered Aug 26 '16 at 20:28

-1

There's no need to spend an hour in the event viewer :

Inside "Network Connections", right click -> "Status".

Here you can see "Speed".

step 1

step 2

answered Aug 26 '16 at 20:28

Narus

27

score -1 · Answer 10 · answered Dec 07 '14 at 19:03

On my Windows 7 Platform -

List item

Type at the Windows 7 search bar Network and Sharing Center. Select - Network and Sharing Center

Change Adapter Settings

Right Click ( The LAN Lannetwrk Adapter) select Status it will show you the speed you have negotiated with the next network device up stream.

score -1 · Answer 11 · edited Mar 02 '11 at 18:48

-1

There is no software-way to report the duplex mode negotiated(especially with a switch) because all of those things happen on the physical layer.

You will need some kind of measurement device to diagnose that electronically.

edited Mar 02 '11 at 18:48

yhw42

2,267

answered Dec 22 '09 at 19:53

score -1 · Answer 12 · answered Dec 22 '09 at 19:58

-1

The easiest way I can think of is to get a switch that has lights on the front or a management interface and simply take a look.

Other than that, I am not really aware of any software able to tell you.

answered Dec 22 '09 at 19:58

William Hilsum

117,648

How do you check the current duplex value of a network card set to Auto negotiate in Windows?

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