Hi ,
Agree with LasRashid, your interface name is Local Area Connection instead of Ethernet, change to Local Area Connection and then see if the command can work.
In addition, what's the OS version of your machine? Windows 7 or windows server 2008? If the command still doesn't work, see if the following link can help you:
Windows 7 System Image Recovery: netsh error “The interface is unknown”
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
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