Microsoft

How to Clear The ARP Cache In Windows 7 and Windows Server 2008

Groovy Windows 7 How-to tips, tricks, and news

In Windows, the Address Resolution Protocol (ARP) is a critical part TCP/IP network communication.  While using the Internet or even a local area network (LAN), you may have experienced issues with connections not being made, or loss of ping.  Often this is because of a physical network problem; however, another cause often overlooked is the ARP cache.

From the command prompt, the ARP Command has the functionality to add, delete, or display MAC Address to IP translation.

 

How To Clear The ARP Cache in Windows

 

1. Click the Windows Start Menu Orb and Type cmd into the search box.  Right-Click cmd.exe and Click Run as administrator

Launch CMD.exe Windows Command Prompt as Administrator

 

2. In the prompt that appears, Type in the following command:

netsh interface ip delete arpcache

arp cache in windows 7

 

Other ARP commands:

arp -aDisplay a list of ARP entries
arp -d <ip #>Delete an IP address from the ARP table
arp -s <ip #> <mac #>Add a static IP to a MAC address in the ARP table
 Example:  arp -s 231.32.54.315 00-FF-23-44-d7-11

 

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6 Comments

6 Comments

  1. Oliver J Siracusa  

    I have tried this and the computer told me to run the command as an administrator. I am the administrator and when I configured windows 7 for the first time I was entered as user by the system. Any workaround please? Thanks and keep up the good work. Regards

    • Good point. You need to launch CMD.exe (Windows Command Prompt) as an Administrator. I’ve updated the How-To article. Plz note the NEW step 1.

      Hopefully this fixes your issue!

  2. buddhika  

    same problem happened to me

    • Hi Buddhika! Welcome to groovyPost.com!

      Take a look at my reply to Oliver. Should fix your problem.

  3. Oliver J Siracusa  

    Thanks for the prompt answer to my problem. That fixed it!! Regards and many thanks.

    Oliver

  4. Real Penguin  

    Hi! We just ran into an issue where we need to perform an arp flush… using a simple user account. I’m looking at being able to do this automatically from an application and don’t want any admin credentials. I don’t suppose you have any ideas?

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