NAME
arp - address resolution display and control

SYNOPSIS
arp hostname
arp -a [ vmunix ] [ kmem ]
arp -d hostname
arp -s hostname ether_addr [ temp ] [ pub ] [ trail ]
arp -f filename

DESCRIPTION
The arp program displays and modifies the Internet-to-Ethernet
address translation tables used by the address resolution protocol
(arp(4)).

With no flags, the program displays the current ARP entry for
hostname. The host may be specified by name or by number, using
Internet dot notation. With the -a flag, the program displays all
of the current ARP entries by reading the table from the file kmem
(default /dev/kmem) based on the kernel file vmunix (default
/vmunix).

With the -d flag, a super-user may delete an entry for the host
called hostname.

The -s flag is given to create an ARP entry for the host called
hostname with the Ethernet address ether_addr. The Ethernet address
is given as six hex bytes separated by colons. The entry will be
permanent unless the word temp is given in the command. If the word
pub is given, the entry will be "published"; i.e., this system will
act as an ARP server, responding to requests for hostname even
though the host address is not its own. The word trail indicates
that trailer encapsulations may be sent to this host.

The -f flag 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 ] [ trail ]

with argument meanings as given above.