System Administration Commands arp(1M)



NAME
arp - address resolution display and control

SYNOPSIS
arp hostname

arp -a [-n]

arp -d hostname

arp -f filename

arp -s hostname ether_address [temp] [pub] [trail]

DESCRIPTION
The arp program displays and modifies the Internet-to-
Ethernet address translation tables used by the address
resolution protocol (see arp(7P)).

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.

OPTIONS
-a Display all of the current ARP entries. The definition
for the flags in the table are:

M Mapping; only used for the multicast entry for
224.0.0.0

P Publish; includes IP address for the machine and the
addresses that have explicitly been added by the -s
option. ARP will respond to ARP requests for this
address.

S Static; not learned for the ARP protocol.

U Unresolved; waiting for ARP response.


You can use the -n option with the -a option to disable the
automatic numeric IP address-to-name translation. Use arp
-an or arp -na to display numeric IP addresses.

-d Delete an entry for the host called hostname. This
option may only be used by the super-user.

-f Read the file named filename and set multiple entries
in the ARP tables. Entries in the file should be of
the form:





SunOS 5.9 Last change: 5 Sep 2002 1






System Administration Commands arp(1M)



hostname ether_address [temp] [pub] [trail]



See the -s option for argument definitions.

-s Create an ARP entry for the host called hostname with
the Ethernet address ether_address. The Ethernet
address is given as six hexadecimal 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. For instance, this
system will respond to ARP requests for hostname even
though the hostname is not its own. The word trail
indicates that trailer encapsulations may be sent to
this host. arp -s can be used for a limited form of
proxy ARP when a host on one of the directly attached
networks is not physically present on the subnet.
Another machine can then be configured to respond to
ARP requests using arp -s. This is useful in certain
SLIP configurations.

ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:

____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|


SEE ALSO
ifconfig(1M), arp(7P), attributes(5)