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How to clear ARP Cache in Windows 2003 / 2008

There are many tools and different ways to troubleshoot TCP/IP network issues. One of those steps could involve clearing the ARP (Address Resolution Protocol) cache. One area where clearing the ARP cache can help is if you are seeing web pages not loading, ability to ping certain IP addresses.
Clearing the ARP cache is easy to do. Open a a command prompt Start > Run > type cmd and click OK. Enter in the following command.

netsh interface ip delete arpcache

It will  take 2 – 20 minutes for the ARP cache to update on the server.

To display the ARP cache type

arp -a

To delete an address from the ARP cache type

arp -d <ip_address>

Add static entry to ARP table

arp -s <ip address> <mac address>

Example

arp -s 192.168.1.20 00-cc-00-61-f6-19

 

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