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Man page of arp
arp
Section: Maintenance Commands (8)
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NAME
arp - Displays and controls Address Resolution Protocol (ARP) tables
SYNOPSIS
/usr/sbin/arp [-u] hostname
arp -a [-u] [system]
arp -d hostname
arp -f filename
arp -s [-u] hostname hardware_addr [temp] [pub] [trail]
FLAGS
Displays all of the current ARP entries.
Deletes the entry for hostname if the
user issuing the command has superuser authority.
Reads entries from filename and adds those
entries to the ARP tables.
Use of this flag requires superuser privilege.
Entries in the file have the following format:
-
hostname hardware_addr [temp] [pub] [trail]
-
Fields in this format are as follows:
Specifies the remote host identified by the entry.
Specifies the hardware address of the remote host.
The address is given as 6 hexadecimal bytes separated by colons.
Specifies that this ARP table entry is temporary.
When this argument is not used, the table entry is permanent.
Indicates that the table entry will be published and that the
current system will act as an ARP server, responding to requests for
hostname even though the host address is not its own.
Indicates that the trailer encapsulation may be sent to this host.
Creates a single ARP entry for hostname.
Use of this flag requires superuser privilege.
The arguments are explained in the discussion of
the -f flag.
Displays the MAC address in noncanonical form with address
bytes reversed and separated by a colon character (:). By default, all
addresses are displayed in canonical form with address bytes separated by
the hyphen character (-).
-
When used with the -s flag, this indicates that the hardware_addr
is in noncanonical form.
DESCRIPTION
The arp command displays or modifies the current ARP entry for
the host specified by hostname.
The host may be specified by name or number, using Internet dot notation.
With no flags, the program displays the current ARP entry for hostname.
The ARP tables can be displayed by any user, but only the superuser can modify
them.
EXAMPLES
To display the ARP address-mapping tables for the local host that has
one interface defined, enter:
-
arp -a
alpha1.dec.com (16.181.20.2) at 08-00-2b-2c-f5-31
alpha2.dec.com (16.100.21.20) at 08-00-2b-3c-2d-fd
To add a single entry for the remote host laszlo to
the ARP mapping tables temporarily, enter:
-
arp -s laszlo 08:00:2b:0f:44:23 temp
-
The address is considered canonical even though the bytes are separated by
colons. For input, the arp command does not use the colon (:) and
hyphen (-) characters to indicate whether the address is canonical or
noncanonical.
-
Note that you must have superuser authority to execute this command.
To add a single entry for the remote host laszlo to
the ARP mapping tables temporarily, enter:
-
arp -u -s laszlo 10:00:d4:f0:22:c4 temp
-
The -u flag indicates the address is noncanonical. Note that
you must have superuser authority to execute this command.
To add multiple entries to the ARP mapping tables from the file
newentries, enter:
-
arp -f newentries
-
Note that you must have superuser authority to execute this command.
FILES
Specifies the command path.
RELATED INFORMATION
Commands:
netstat(1), ifconfig(8)
Protocols:
arp(7)
Specifications: RFC826
delim off
Index
- NAME
-
- SYNOPSIS
-
- FLAGS
-
- DESCRIPTION
-
- EXAMPLES
-
- FILES
-
- RELATED INFORMATION
-
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Time: 02:40:42 GMT, October 02, 2010