How to Clean the Arp Cache
Administrators in a Windows environment can clear an address resolution protocol (ARP) cache when it becomes corrupted, which creates a new address table and fixes some address resolution issues. This is done at the Windows command prompt.
Instructions
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Click the Windows Start button and select "Run." Type "cmd" into the text box to start the DOS command shell.
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Type "arp" into the command prompt. This gives you a list of ARP syntax references and instructions for how to use them.
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Type "netsh interface ip delete arpcache" into the command prompt. This will remove entries from the cache.
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Tips & Warnings
Use "arp -a" to view current entries in the cache.