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RARPD(8)                    System Manager's Manual                   RARPD(8)

NAME
       rarpd - reverse address resolution protocol daemon

SYNOPSIS
       rarpd [-d[level]] network-name ...

DESCRIPTION
       Rarpd  listens  on  the given networks for broadcast packets asking for
       reverse address resolution.  These packets are sent by  hosts  at  boot
       time  to  find  out  their  IP  address.   Rarpd looks up the six octet
       ethernet number in the /etc/ethers file finding a host name.  This name
       is  translated  to  the IP address of the host by a DNS lookup.  The IP
       address is then sent to the host.

       Under MINIX 3 the program forks as needed to give each network its  own
       server.   Under  Minix-vmd all networks are handled in the same program
       using async I/O.

   Private Ethernet Addresses
       For VU practical work, where students have to create their own IP stack
       starting  at  the  bottom  with  RARP,  this  implementation recognizes
       Ethernet addresses starting with octet 0x76 as special.  The next octet
       is  used  as a additional host number and the next and last four octets
       as an IP address that this Ethernet address is additional for.  The  IP
       address  is  translated back to a name, and the first component of that
       name gets a dash and the additional host  number  added  to  it.   That
       hostname is then looked up and its IP address returned in a RARP reply.
       Example:

              76:3:c0:a8:e7:fa        Additional 3, IP 192.168.231.250

              flotsam.example.com     Reverse lookup on 192.168.231.250

              flotsam-3.example.com   Splicing in additional number

              192.168.231.42          Forward lookup

       In this example a RARP query for 76:3:c0:a8:e7:fa  gets  192.168.231.42
       as reply.

OPTIONS
       -d[level]
              Turns  on  debugging  messages at the given level, by default 1.
              At level 1 you will be shown what answers are sent, and at level
              2 or higher you will be told about queries from unknown hosts or
              host on  the  wrong  network.   The  debug  level  can  also  be
              increased  by  1  at runtime by sending signal SIGUSR1 or turned
              off (set to 0) with SIGUSR2.

SEE ALSO
       ifconfig(8), ethers(5), hosts(5), inet(8), boot(8), dhcpd(8), irdpd(8),
       inetd(8), nonamed(8).

NOTES
       A "network name" is the device name of the IP device of a network, i.e.
       ip0, ip1, ...

       The RARP protocol has gone out of fashion in favour of DHCP.

AUTHOR
       Kees J. Bot (kjb@cs.vu.nl)

                                                                      RARPD(8)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SEE ALSO | NOTES | AUTHOR