rarpd(1M)              UNIX System V(Internet Utilities)              rarpd(1M)


NAME
      rarpd - DARPA Reverse Address Resolution Protocol server

SYNOPSIS
      rarpd interface [ hostname ]

      /usr/sbin/rarpd -a

DESCRIPTION
      rarpd starts a daemon that responds to Reverse Address Resolution
      Protocol (RARP) requests.  The daemon forks a copy of itself that runs in
      background.  It must be run as root.

      RARP is used by machines at boot time to discover their Internet Protocol
      (IP) address.  The booting machine provides its Ethernet Address in a
      RARP request message.  Using the ethers and hosts databases, rarpd maps
      this Ethernet Address into the corresponding IP address which it returns
      to the booting machine in an RARP reply message.  The booting machine
      must be listed in both databases for rarpd to locate its IP address.
      rarpd issues no reply when it fails to locate an IP address.

      In the first synopsis, the interface parameter names the network
      interface upon which rarpd is to listen for requests.  The interface
      parameter takes the ``name unit'' form used by ifconfig(1M).  The second
      argument, hostname, is used to obtain the IP address of that interface.
      An IP address in ``decimal dot'' notation may be used for hostname.  If
      hostname is omitted, the address of the interface will be obtained from
      the kernel.  When the first form of the command is used, rarpd must be
      run separately for each interface on which RARP service is to be
      supported.  A machine that is a router may invoke rarpd multiple times,
      for example:

            /usr/sbin/rarpd emd1 host
            /usr/sbin/rarpd emd2 host-backbone

      In the second synopsis, rarpd locates all of the network interfaces
      present on the system and starts a daemon process for each one that
      supports RARP.

FILES
      /etc/ethers
      /etc/hosts

SEE ALSO
      ifconfig(1M), ethers(4), hosts(4), netconfig(4), boot(8)

      Finlayson, Ross, Timothy Mann, Jeffrey Mogul, and Marvin Theimer, A
      Reverse Address Resolution Protocol, RFC 903, Network Information Center,
      SRI International, Menlo Park, Calif., June 1984.





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