GregShields

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How Can One Determine Network Speed & Duplex of an Auto-Negotiated NIC?

Sat 17 Oct 2009


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This seems like a basic question, but I can’t find an answer anywhere. I recently upgraded all the 100BaseT switches in the house to 1000BaseT switches. Running a file transfer test shows that the file transfer is still in the 100BaseT range. I want to confirm my speed and duplex settings on my network cards.

Is there a command line or script-based tool I can use to determine if my computers have auto-negotiated to the new gigabit speed?

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A-ha. My D-Link switches are color-coded. Amber for 100, Green for 1000. This solves the immediate problem, but doesn’t help me with my larger question: Is there a script or tool that can enumerate this from the computer’s perspective?

GregShields
by GregShields on Sat 17 Oct 2009
0

I tought 1000BaseT is full duplex by default.
Maybe a netsh script can help..

Anonymous
by Anonymous on Mon 19 Oct 2009 17:10
0

I was able to do a little googling and found this information. While it’s not exactly the answer you may be seeking. It looks like all the information is here to possibly write a powershell script that would do what you want.

http://itknowledgeexchange.techtarget.com/vbscript-systems-administrator/writing-a-bginfo-like-script-displaying-network-adapter-speed-with-wmi-via-the-win32_networkadapter-class/

Anonymous
by Anonymous on Mon 19 Oct 2009 22:10
1

Hi,

I created such a Powershell script some time ago. You may need to add sections for your specific NIC vendor, as they all use different registry keys.

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

Hugo Peeters
www.peetersonline.nl

Anonymous
by Anonymous on Tue 20 Oct 2009 15:10