Adding a static arp to Windows Server 2012

For some reason, my windows server wouldn’t talk to one of my network devices. It would talk to all the others, but not this one. I tried changing the ip address of the device, and even swapped it out for a similar device of a different model and manufacturer. Still no dice. When I looked closer, I saw that the ip address of the device wasn’t in the arp table on the windows server, so I tried to manually add it.

arp -s IP.Address Mac.Address

Error message, you don’t have sufficient privileges.

Ok, so let’s try this in CMD as Administrator

Error message, permission denied.

A quick google search, and I found that I need to use netsh instead.

netsh interface ip add neighbors "Network card name here" "" "MAC-address-of-gateway-with-dash-here"

bam! Ping and network connectivity fixed. The WHY of this happening is still a mystery however.

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One Response to Adding a static arp to Windows Server 2012

  1. zinger says:

    I did eventually figure it out. I’d hooked up a bunch of network cameras to my network, and they all had the same address. Multiple simultaneous conflict addresses in the mac table seems to have freaked out my switch. I rebooted the switch, and things seemed to resolve.

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