RARP(8) Linux System Administrator's Manual RARP(8)NAME
rarp - manipulate the system RARP table
SYNOPSIS
rarp [-V] [--version] [-h] [--help]
rarp -a
rarp [-v] -d hostname ...
rarp [-v] [-t type] -s hostname hw_addr
NOTE
This program is obsolete. From version 2.3, the Linux kernel no longer contains RARP support. For a replacement RARP daemon, see
ftp://ftp.dementia.org/pub/net-tools
DESCRIPTION
Rarp manipulates the kernel's RARP table in various ways. The primary options are clearing an address mapping entry and manually setting
up one. For debugging purposes, the rarp program also allows a complete dump of the RARP table.
OPTIONS -V Display the version of RARP in use.
-v Tell the user what is going on by being verbose.
-t type
When setting or reading the RARP table, this optional parameter tells rarp which class of entries it should check for. The default
value of this parameter is ether (i.e. hardware code 0x01 for IEEE 802.3 10Mbps Ethernet . Other values might include network tech-
nologies such as AX.25 (ax25) and NET/ROM (netrom).
-a
--list Lists the entries in the RARP table.
-d hostname
--delete hostname
Remove all RARP entries for the specified host.
-s hostname hw_addr
--set hostname hw_addr
Create a RARP address mapping entry for host hostname with hardware address set to hw_addr. The format of the hardware address is
dependent on the hardware class, but for most classes one can assume that the usual presentation can be used. For the Ethernet
class, this is 6 bytes in hexadecimal, separated by colons.
WARNING
Some systems (notably older Suns) assume that the host replying to a RARP query can also provide other remote boot services. Therefore
never gratuitously add rarp entries unless you wish to meet the wrath of the network administrator.
FILES
/proc/net/rarp,
SEE ALSO arp(8), route(8), ifconfig(8), netstat(8)AUTHORS
Ross D. Martin, <martin@trcsun3.eas.asu.edu>
Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
Phil Blundell, <Philip.Blundell@pobox.com>
net-tools 2008-10-03 RARP(8)
Check Out this Related Man Page
ARP(8) Linux Programmer's Manual ARP(8)NAME
arp - manipulate the system ARP cache
SYNOPSIS
arp [-evn] [-H type] [-i if] -a [hostname]
arp [-v] [-i if] -d hostname [pub]
arp [-v] [-H type] [-i if] -s hostname hw_addr [temp]
arp [-v] [-H type] [-i if] -s hostname hw_addr [netmask nm] pub
arp [-v] [-H type] [-i if] -Ds hostname ifa [netmask nm] pub
arp [-vnD] [-H type] [-i if] -f [filename]
DESCRIPTION
Arp manipulates the kernel's ARP cache in various ways. The primary options are clearing an address mapping entry and manually setting up
one. For debugging purposes, the arp program also allows a complete dump of the ARP cache.
OPTIONS -v, --verbose
Tell the user what is going on by being verbose.
-n, --numeric
shows numerical addresses instead of trying to determine symbolic host, port or user names.
-H type, --hw-type type, -t type
When setting or reading the ARP cache, this optional parameter tells arp which class of entries it should check for. The default
value of this parameter is ether (i.e. hardware code 0x01 for IEEE 802.3 10Mbps Ethernet). Other values might include network tech-
nologies such as ARCnet (arcnet) , PROnet (pronet) , AX.25 (ax25) and NET/ROM (netrom).
-a [hostname], --display [hostname]
Shows the entries of the specified hosts. If the hostname parameter is not used, all entries will be displayed. The entries will
be displayed in alternate (BSD) style.
-d hostname, --delete hostname
Remove any entry for the specified host. This can be used if the indicated host is brought down, for example.
-D, --use-device
Use the interface ifa's hardware address.
-e Shows the entries in default (Linux) style.
-i If, --device If
Select an interface. When dumping the ARP cache only entries matching the specified interface will be printed. When setting a perma-
nent or temp ARP entry this interface will be associated with the entry; if this option is not used, the kernel will guess based on
the routing table. For pub entries the specified interface is the interface on which ARP requests will be answered.
NOTE: This has to be different from the interface to which the IP datagrams will be routed.
-s hostname hw_addr, --set hostname
Manually create an ARP address mapping entry for host hostname with hardware address set to hw_addr class, but for most classes one
can assume that the usual presentation can be used. For the Ethernet class, this is 6 bytes in hexadecimal, separated by colons.
When adding proxy arp entries (that is those with the publish flag set a netmask may be specified to proxy arp for entire subnets.
This is not good practice, but is supported by older kernels because it can be useful. If the temp flag is not supplied entries will
be permanent stored into the ARP cache.
NOTE: As of kernel 2.2.0 it is no longer possible to set an ARP entry for an entire subnet. Linux instead does automagic proxy arp
when a route exists and it is forwarding. See arp(7) for details.
-f filename, --file filename
Similar to the -s option, only this time the address info is taken from file filename set up. The name of the data file is very
often /etc/ethers, but this is not official. If no filename is specified /etc/ethers is used as default.
The format of the file is simple; it only contains ASCII text lines with a hostname, and a hardware address separated by whitespace.
Additionally the pub, temp and netmask flags can be used.
In all places where a hostname is expected, one can also enter an IP address in dotted-decimal notation.
As a special case for compatibility the order of the hostname and the hardware address can be exchanged.
Each complete entry in the ARP cache will be marked with the C flag. Permanent entries are marked with M and published entries have the P
flag.
FILES
/proc/net/arp,
/etc/networks
/etc/hosts
/etc/ethers
SEE ALSO rarp(8), route(8), ifconfig(8), netstat(8)AUTHORS
Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org> with a lot of improvements from net-tools Maintainer Bernd Eckenfels <net-
tools@lina.inka.de>.
net-tools 5 Jan 1999 ARP(8)