Display and modify the IP-to-Physical address translation tables used by address resolution protocol. 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 may have had the MAC address for the other computer placed in it.
ARP -s inet_addr eth_addr [if_addr]
ARP -d inet_addr [if_addr]
ARP -a [inet_addr] [-N if_addr] [-v]
|-a||Display current ARP entries. May include more than one network interface. If ip_addr is specified, the IP and Physical addresses for only the specified computer are displayed.|
|-g||Same as -a.|
|-N if_addr||Display the ARP entries for the network interface specified by if_addr.|
|-d ip_addr||Delete the host specified by ip_addr. -d * will delete all hosts.|
|-s||Add the host and associates the Internet address ip_addr with the Physical address eth_addr. The Physical address is given as 6 hexadecimal bytes separated by hyphens. The entry is permanent.|
|eth_addr||Specifies a physical address.|
|if_addr||If present, this specifies the Internet address of the interface whose address translation table should be modified. If not present, the first applicable interface will be used. If two hosts on the same sub-net 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.|
C:> arp -a
C:> arp -a -N 10.1.4.99
C:> arp -s 10.1.4.77 00-AA-21-4A-2F-9A
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