The Address Resolution Protocol (ARP) is very crucial for TCP/IP network communication. If you begin to notice network connectivity problems such as particular web pages not loading or not being able to ping certain IP addresses then clearing your ARP cache is a good place to start.The TCP/IP ARP Command component provides the functionality to add, delete, or display the IP address for Media Access Control (MAC) address translation.
To flush/Delete the ARP cache in windows 7/Vista/XP/2000/Server 2003/2008 follow this procedure

Click on Start—>Run—> type the following command click ok

netsh interface ip delete arpcache

Dynamic ARP cache entries update persist for 2-20 minutes depending on the system.

Windows 2003 Server = 10 minutes

Windows 2000 professional/Server = 10 minutes

Windows XP = 2 minutes

Solaris = 5 minutes

Delete IP address using arp command

arp -d <ip address>

Example

arp -d 10.1.1.2

Display arp table

arp -a

Add static entry to ARP table

arp -s <ip address> <mac address>

Example

arp -s 157.55.85.212 00-aa-00-62-c6-09

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