Windows 10 ARP entry addition fails with access denied message

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It is possible that on Windows even with having Administrator CMD open (right click - run-as administrator), the system gives access denied messages while trying to add static ARP entries using 'arp' command. For example:

CMD> arp -s 172.24.7.254 00-05-01-f9-28-00 172.24.1.20

The ARP entry addition failed: Access is denied.

Syntax of ARP command is:

arp -s <IP-of-other-machine-in-same-subnet> <MAC-of-other-machine> [<IP-of-current-machine>]

where:

• Other machine and current machine should have some common subnet range
• We need to give IP of remote machine which is sharing subnet with current machine and corresponding interface MAC
• Optionally we can give IP address of current machine

If the above does not works then use:

1. Get list of network interfaces:

   netsh interface show interface

2. Optionally delete existing ARP cache using:

   netsh interface ip delete neighbors "Network card name here" "Gateway.IP.goes.here"

3. Add desired static ARP entry using:

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

Refer:

• https://superuser.com/questions/101293/windows-7-the-arp-entry-addition-failed-access-is-denied

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