ARP.exe – Windows CMD Command

ARP – Address Resolution Protocol

Display and modify the IP-to-Physical address translation tables used by address resolution protocol.

If two hosts on the same subnet cannot ping each other successfully, try running ARP -a to list the addresses on each computer to see if they have the correct MAC addresses.

A host’s MAC address can be checked using IPCONFIG. If another host with a duplicate IP address exists on the network, the ARP cache might have had the MAC address for the other computer placed in it. ARP -d is used to delete an entry that is incorrect.

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