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       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 ifa  [netmask  nm]

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


       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 symbolic 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 (arc­
              net) , PROnet (pronet) , AX.25 (ax25)  and  NET/ROM

       -a [hostname], --display [hostname]
              Shows  the  entries of the specified hosts.  If the
              hostname parameter is not used, all entries will be

       -d hostname, --delete hostname
              Remove  any entry for the specified host.  This can
              be used if the indicated host is brought down,  for

       -D, --use-device
              Use the interface ifa's hardware address.
              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 ker­
              nels 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 file­
              name 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 host­
       name 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  pub­
       lished entries have the P flag.




       rarp(8), route(8), ifconfig(8), netstat(8)


       Fred  N.  van  Kempen, <waltje@uwalt.nl.mugnet.org> with a
       lot of improvements from net-tools Maintainer Bernd Ecken­



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