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na_arp - Address resolution display and control


arp [-n] hostname

arp [-n] -a

arp -d hostname

arp -s hostname ether_address [ temp ] [ pub ]


The arp command displays and modifies the tables that the address resolution protocol uses to translate between Internet and Ethernet addresses.

With no flags, arp displays the current ARP entry for hostname. The host may be specified by name or by number, using Internet dot notation.


Displays all of the current ARP entries.

Deletes an entry for the host called hostname.

IP addresses are displayed instead of hostnames.

Creates an ARP entry for the host called hostname with the Ethernet address ether_address. The Ethernet address is given as six hex bytes separated by colons. The entry not will be permanent if the words following -s includes the keyword temp. Temporary entries that consist of a complete Internet address and a matching Ethernet address are flushed from the arp table if they haven't been referenced in the past 20 minutes. A permanent entry is not flushed.

If the words following -s include the keyword pub, the entry will be "published"; that is, this system will act as an ARP server, responding to requests for hostname even though the host address is not its own.


In takeover mode, each node in an HA pair maintains its own ARP table. You can make changes to the ARP table on the live node, or you can make changes to the ARP table on the failed node using the arp command in partner mode. However, the changes you make in partner mode are lost after a giveback.


When run from a vfiler context, (for example, via the vfiler run command), arp operates on the concerned vfiler. As currently all vfilers in an ipspace share an arp table, arp operates on the arp table of the concerned vfiler's ipspace.


na_ifconfig(1), na_partner(1), na_ipspace(1), na_vfiler(1), RFC1483.

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