Hello, I manage a large number of computers at a college and need a way to determine the full/half duplex settings easily. In our network some ports are set to auto-negotiate and others are forced full. My computers are all set at auto-negotiate and when it is connected to a forced full port the result is half duplex. I need an easy way to identify the forced ports. Options I have....use a network tester to manually test each port (not easy, very time consuming) or copy a large file to each computer and see which ones are slower. Some of the computers we have use Intel network cards. The device manager config area actually shows you the current setting and the effective speed. I'm hoping for a command or something that will work for any type network card. Thanks Mike S

Hi Mike, you can check it on advance of network adapters: 1 Right click “Computer” and choose “Manage” 2 Go to “Device Manager” and find “Network adapters” 3 Right click your network adapter and click “Properties” 4 Click Advanced, choose “Speed&Duplex” in Property You can see the value of duplex is set to Half or Full speed. Regards, Leo HuangPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Thanks for the response Leo. That is the setting for speed and duplex but not the actual speed. I have all the computers set to Autonegotiate. If the Cisco Switch network port is NOT set to Autonegotiate as well then you get what is known as a Duplex Mismatch (http://en.wikipedia.org/wiki/Duplex_mismatch). The resulting speed is half duplex. I need to identify the ports on the network switch that are NOT set to autonegotiate. Mike S

What you have experienced is common for systems set to Auto-negotiate, but switch ports set to a particular setting. You are probably experiencing slowness on those systems that are mis-matched. I think your best bet is to use the admin console used to manage your switches. Generally, from what I have seen across vendors, you should have a GUI that will show ports in different color codes based on port settings. Additionally, these managed switches will allow you to get that information using their CLI. This approach should be easier than trying to come up with a solution to interrogate the systems for this information. Visit: anITKB.com, an IT Knowledge Base.