ARP.exe – Windows CMD Command
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ARP – Address Resolution Protocol
Display and modify the IP-to-Physical address translation tables used by address resolution protocol.
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Syntax View the contents of the local ARP cache table ARP -a [ip_addr] [-N if_addr] Add a static Arp entry for frequent accessed hosts ARP -s ip_addr eth_addr [if_addr] Delete an entry ARP -d ip_addr [if_addr] Key -a Display current ARP entries. Can 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 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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Examples Display the ARP cache tables for all interfaces: C:\> arp -a Display the ARP cache table for the interface on IP address 10.1.4.99: C:\> arp -a -N 10.1.4.99 Add a static ARP cache entry on IP addr 10.1.4.77 to the physical address 00-AA-21-4A-2F-9A: C:\> arp -s 10.1.4.77 00-AA-21-4A-2F-9A |
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