arp —
address resolution display and control
arp |
[-v] -d
hostname [proxy] |
arp |
-s hostname ether_addr
[temp] [pub
[proxy]] |
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.
Available options:
-a
- The program displays all of the current ARP entries.
-d
- A super-user may delete an entry for the host called
hostname with the
-d flag.
If the proxy keyword is specified, only the
published “proxy only” ARP entry for this host will be
deleted. If used with -a instead of a
hostname, it will delete all arp entries.
-f
- 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]
with argument meanings as described below.
-n
- Show network addresses as numbers (normally
arp
attempts to display addresses symbolically).
-s
hostname ether_addr
- 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.
If the word proxy is also given, the
published entry will be a “proxy only” entry. In this case
the ether_addr can be given as
auto in which case the interfaces on this host
will be examined, and if one of them is found to occupy the same subnet,
its Ethernet address will be used.
-v
- Display verbose information when adding or deleting ARP entries.
The arp command appeared in
4.3BSD.