How to Clear the Windows ARP Cache

Windows XP
1. Click on the “Start” button and click “Run.”
2. Type “CMD” without the quotes and press the “Enter” key. This will load the Windows command prompt.
3. Type the command listed below into your command prompt.
C:\\>netsh interface IP delete arpcache
4. Press “Enter” on your keyboard. When the command finishes, you will see a line that says “Ok.” Close the command prompt once the command has been completed.Note: If you receive an error while issuing this command, a conflict exists that needs to be addressed (see Tips).
Windows Vista/7:
5. Click on the “Start” button then “All Programs.”
6. Click on the “Accessories” folder.
7. Right-click on the “Command Prompt” link and select “Run as administrator” from the right-click menu.
8. Type the command listed below into your command prompt.C:\\>netsh interface IP delete arpcache
9. Press “Enter” on your keyboard. When the command finishes you will see a line that says “Ok.” Close the command prompt once the command has been completed.