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

       arp - manipulate the system ARP cache

       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]

       This program is obsolete. For replacement check ip neighbor.

       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  pur-
       poses, the arp program also allows a complete dump of the ARP cache.

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

       -a [hostname], --all [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 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

              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

              The  format  of the file is simple; it only contains ASCII text lines with a
              hardware address and a hostname 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.



       Fred N. van Kempen, <waltje AT> with a lot  of  improvements  from
       net-tools Maintainer Bernd Eckenfels <net-tools AT>.

net-tools                         5 Jan 1999                            ARP(8)

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