Arp

This diagnostic command displays and modifies the IP-to-Ethernet or IP-to-token ring address translation tables used by the address resolution protocol (ARP).

Syntax

arp -a [inet_addr] [-N [if_addr]]
arp -d inet_addr [if_addr]
arp -s inet_addr ether_addr [if_addr]

Parameters

-a

Displays current ARP entries by querying TCP/IP. If inet_addr is specified, only the IP and physical addresses for the specified computer are displayed.

-d

Deletes the entry from the ARP cache table that is specified by inet_addr.

-s

Adds an entry in the ARP cache to associate the IP address inet_addr with the physical address ether_addr. The physical address is given as 6 hexadecimal bytes separated by hyphens. The IP address is specified using dotted decimal notation. The entry is permanent, that is, it will not be automatically removed from the cache after the timeout expires.

-N [if_addr]

Displays the ARP entries for the network interface specified by if_addr.

ether_addr

Specifies a physical address.

if_addr

Specifies, if present, the IP address of the interface for which the address translation table should be modified. If not present, the first applicable interface will be used.

inet_addr

Specifies an IP address in dotted decimal notation.