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ARP(8)			   Linux Programmer's Manual			ARP(8)

NAME
       arp - manipulate the system ARP cache

SYNOPSIS
       arp [-vn] [-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 ifname [netmask nm] pub

       arp [-vnD] [-H type] [-i if] -f [filename]

DESCRIPTION
       Arp  manipulates or displays the kernel's IPv4 network neighbour cache.
       It can add entries to the table, delete one or display the current con‐
       tent.

       ARP  stands  for Address Resolution Protocol, which is used to find the
       media access control address of a network neighbour for	a  given  IPv4
       Address.

MODES
       arp with no mode specifier will print the current content of the table.
       It is possible to limit the number of entries printed, by specifying an
       hardware address type, interface name or host address.

       arp  -d	address	 will delete a ARP table entry. Root or netadmin priv‐
       eledge is required to do this. The entry is found by IP address.	 If  a
       hostname	 is  given, it will be resolved before looking up the entry in
       the ARP table.

       arp -s address hw_addr is used to set up a new table entry. The	format
       of  the	hw_addr	 parameter 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. 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 perma‐
       nent stored into the ARP cache. To simplyfy setting up entries for  one
       of  your own network interfaces, you can use the arp -Ds address ifname
       form. In that case the hardware address is  taken  from	the  interface
       with the specified name.

OPTIONS
       -v, --verbose
	      Tell the user what is going on by being verbose.

       -n, --numeric
	      shows  numerical	addresses  instead of trying to determine sym‐
	      bolic host, port or user names.

       -H type, --hw-type 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 technologies such as ARCnet  (arcnet)  ,	PROnet
	      (pronet) , AX.25 (ax25) and NET/ROM (netrom).

       -a     Use alternate BSD style output format (with no fixed columns).

       -D, --use-device
	      Instead  of  a  hw_addr,	the  given  argument is the name of an
	      interface.  arp will use the MAC address of that	interface  for
	      the  table  entry.  This	is usually the best option to set up a
	      proxy ARP entry to yourself.

       -i If, --device If
	      Select an interface. When dumping the  ARP  cache	 only  entries
	      matching the specified interface will be printed. When setting a
	      permanent 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.  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.  Also  the  dontpub	option
	      which  is available for delete and set operations cannot be used
	      with 2.4 and newer kernels.

       -f filename, --file filename
	      Similar to the -s option, only this time	the  address  info  is
	      taken from file filename.	 This can be used if ARP entries for a
	      lot of hosts have to be 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.

EXSAMPLES
       /usr/sbin/arp -i eth0 -Ds 10.0.0.2 eth1 pub

       This will answer ARP requests for 10.0.0.2 on eth0 with the MAC address
       for eth1.

       /usr/sbin/arp -i eth1 -d 10.0.0.1

       Delete the ARP table entry for 10.0.0.1 on interface  eth1.  This  will
       match published proxy ARP entries and permanent entries.

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>,  Bernd  Eckenfels
       <net-tools@lina.inka.de>.

net-tools			  2007-12-01				ARP(8)
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