ARP(ADMN)                                  UNIX System V



     Name
          arp - address resolution display and control


     Syntax
          arp hostname
          arp -a [namelist] [corefile]
          arp -d hostname
          arp -s hostname ether_addr [temp] [pub] [trail]
          arp -f filename


     Description
          The arp  program  displays  and  modifies  the  Internet-to-
          Ethernet   address-translation   table,  which  is  normally
          maintained by the address-resolution protocol (arp(ADMP)).

          When hostname is the only argument, arp displays the current
          ARP entry for hostname. The host may be specified by name or
          number, using Internet dot notation.  [See  hosts(ADMN)  and
          inet(ADMP).]

          Options are interpreted as follows:

          -a [ namelist ] [ corefile ]
               Display all of the current ARP entries by  reading  the
               table  from the file corefile (default /dev/kmem) based
               on the kernel file namelist (default /unix).

          -d   Delete an entry for the host whose  name  is  hostname.
               (This can be performed only by the super user.)

          -s hostname ether_addr [temp] [pub] [trail]
               Create an ARP entry for the host whose name is hostname
               with  the  Ethernet  address  ether_addr.  The Ethernet
               address is  given  as  six  colon-separated,  two-digit
               hexadecimal  numbers.   The  entry  will  be  permanent
               unless the argument temp is specified  on  the  command
               line. If pub is specified, the entry will be published:
               that is,  this  system  will  act  as  an  ARP  server,
               responding  to  requests  for  hostname even though the
               host address is not an address of the local  host.   If
               trail  is  specified,  trailer encapsulations are to be
               used  with  this  host.   N.B.  Trailers  are  a  link-
               dependent  issue.  Currently,  no  known  LLI-compliant
               ethernet driver suppports trailers, and it is unwise to
               advertise  them,  unless  it  is  certain that the link
               layer can handle them.

          -f filename
               Read the file filename and set multiple entries in  the
               ARP tables.  Entries in the file should be of the form:


                    hostname ether_addr [temp] [pub] [trail]

               with argument meanings as given above.


     See Also
          inet(SLIB), arp(ADMP), ifconfig(ADMN).


     (printed 8/17/89)                                  ARP(ADMN)