Find Actual Link Speed / Duplex

Question

_{Tuesday, July 13, 2010 2:57 PM | 1 vote}

If the link speed/duplex of the network card is set to Auto, is there a way to find the actual link speed and duplex (full or half) status on windows machine? I mean on windows server, not on switch/router. Thanks

All replies (6)

_{Tuesday, July 13, 2010 3:06 PM ✅Answered}

Not sure about the duplex setting in Windows, but if you look at the Adapter Status, it will display the link speed.  If you are connected to a switch port, you could assume FULL Duplex assuming you do not have the port set to HALF.  Of course, if you have a managed switch, you can simply look at the port stats.

Visit: anITKB.com, an IT Knowledge Base.

_{Tuesday, July 13, 2010 3:26 PM ✅Answered}

I am pretty sure that there is nothing built-into Windows to provide you with the effective duplex setting.  However, if the NIC's vendor that you have installed may have software/drivers that you can install.  This is very common for Intel, HP, etc...  When you have the vendor software installed, you get additional information (including effective duplex information) when you access the properties of the NIC.Visit: anITKB.com, an IT Knowledge Base.

_{Wednesday, July 14, 2010 4:06 AM ✅Answered}

Hi Ian3  ,

JM is right. Based on my knowledge ,there is not a Microsoft build in utility could check actual duplex state when it is set to “Auto”.

But maybe you can check it by custom script , NIC factory or third party utility .

Here are some links for your reference :

http://84.45.57.224/topic12327&OB=DESC.html

http://www.peetersonline.nl/index.php/powershell/gather-nic-properties-including-speed-and-duplex/

Important Note: This response contains a reference to a third party World Wide Web site. Microsoft is providing this information as a convenience to you. Microsoft does not control these sites and has not tested any software or information found on these sites; therefore, Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. There are inherent dangers in the use of any software found on the Internet, and Microsoft cautions you to make sure that you completely understand the risk before retrieving any software from the Internet.

Thanks.

Tiger Li

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_{Tuesday, July 13, 2010 3:15 PM}

Thanks. But I need to know how to find the Duplex Full or Half status on the server, not on switch.

_{Friday, April 14, 2017 3:56 PM | 2 votes}

powershell "Get-NetAdapter | SELECT name, fullduplex | where name -eq ‘nic name’"

_{Wednesday, July 5, 2017 5:06 PM}

powershell "Get-NetAdapter | SELECT name, fullduplex | where name -eq ‘nic name’"

Thank you so much, Andy!