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rarpd(8)							     rarpd(8)



NAME

  rarpd	- Reverse address resolution protocol (RARP) daemon

SYNOPSIS

  /usr/sbin/rarpd [interface] [-v] [-n]	[-f filename]

OPTIONS

  interface
      Specifies	the system's network interface.

  -v  Causes rarpd to operate in verbose mode.	This option logs details of
      RARP to syslog. The instance of a	RARP request and its response are
      also logged.

  -n  Disables checking	of the ethers(4) file.	By default, rarpd checks the
      ethers file once every ten minutes, and, if the file was modified,
      rarpd rereads the	file. If you specify the -n option rarpd scans the
      /etc/ethers file once at startup time.

  -f filename
      Reads an alternate Ethernet address file.

DESCRIPTION

  The rarpd daemon maps	the Ethernet address of	a machine to the machine's
  Internet Protocol (IP) address.

  When rarpd is	invoked, it reads the /etc/ethers file (by default) and	waits
  to process a RARP request. The /etc/ethers file is checked every ten
  minutes for any changes.  If the file	has been modified, rarpd reads it
  again. You can disable this feature with the -n option. You can force	a
  scan of the /etc/ethers file by sending the rarpd daemon a SIGHUP signal.
  See signal(2)	for more information on	SIGHUP.

  The format of	the /etc/ethers	file is	described in ethers(4).	You can
  specify a file other than /etc/ethers	with the -f option.  The interface is
  the network interface	on which the rarpd daemon should listen. The command
  netstat -i shows the correct interface or interfaces for your	system.	The
  rarpd	daemon uses the	first interface	it finds, if you do not	specify	an
  interface.  See the netstat(1) reference page	for more information.

  Because the rarpd daemon has been implemented	with the Ethernet Packet
  Filter (see packetfilter(7)),	you must configure your	kernel with the
  packet filter	option in order	for rarpd to function properly.	The packet
  filter detects RARP broadcast	packets	and passes them	to rarpd for process-
  ing. The filter priority for rarpd is	set to 28.

  All messages from the	rarpd daemon are directed to syslog.



RESTRICTIONS

  The rarpd daemon ignores all ARP requests sent encapsulated within a RARP
  packet. ARP requests are handled directly by the kernel.

  The machine for which	an IP address is being requested must be present in
  the server's /etc/hosts file.

ERRORS

  If the Packet	Filter is not configured in your kernel, the following mes-
  sage is displayed on the console window and logged to	syslog:

       PACKETFILTER is not configured in /vmunix

FILES

  /etc/ethers
      Database that maps Ethernet addresses to hostnames

SEE ALSO

  Commands: arp(8), ifconfig(8), syslogd(8)

  Routines: ethers(3)

  Files: ethers(4), hosts(4), packetfilter(7)