arp - address resolution display and control
arp [ -nv ] hostname
arp [ -nv ] -a
arp [ -nv ] -c
arp -d hostname
arp -s hostname ether_addr [ temp ] [ pub ] [ proxy-only ]
arp -f filename
The arp program displays and modifies the Internet-to-Ethernet address
translation tables used by the address resolution protocol (arp(7P)).
With no flags, the program displays the current ARP entry for hostname.
The host can be specified by name or by number, using Internet dot
The arp flags are:
-a Display all of the current ARP entries by reading the table from the
-c Clear all of the current non-permanent ARP entries from the table.
A superuser can delete an entry for the host called hostname.
-s hostname ether_addr
Creates an ARP entry for the host called hostname with the Ethernet
address ether_addr. The Ethernet address is given as six hexadecimal
bytes separated by colons. The entry is permanent unless the word
temp is given in the command. If the word pub is given, the entry is
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.
If proxy-only is given, the entry is published, but it will not be
used by this system for packets send to hostname, which can be useful
when hostname is reached by other means such as a PPP link.
Causes the file filename to be read and multiple entries to be set in
the ARP tables. Entries in the file should be of the form:
hostname ether_addr [ temp ] [ pub ] [ proxy-only ]
with argument meanings as given above.
-n Causes mapping of IP addresses to hostnames to be suppressed.
-v Causes additional information to be displayed, such as the interface
associated with entries and the age of the arp entries. Only a
superuser may use this flag.
Command lines are followed by the output.
A completed successful entry:
# arp moose
moose (184.108.40.206) at 8:0:69:2:24:3e
A completed successful entry that is marked permanent and published:
# arp rainbow
rainbow (220.127.116.11) at 8:0:69:2:4:94 permanent published
An incomplete entry:
# arp ender
ender (18.104.22.168) at (incomplete)
A nonexistent entry:
# arp foobar
foobar (22.214.171.124) -- no entry
ifconfig(1M), arp(7P), inet(7F).
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