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           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           This program is obsolete.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  purposes, 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  sym-
                  bolic 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
                  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
           -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  hardware  address  and  a  hostname separated by
                  whitespace. Additionally the pub, temp and netmask flags can  be
           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






           Fred N. van Kempen, <> with a lot of improve-

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