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

     rarpd -- reverse ARP daemon

     rarpd -a [-dfsv] [-t directory] [-P pidfile]
     rarpd [-dfsv] [-t directory] [-P pidfile] interface

     The rarpd utility services	Reverse	ARP requests on	the Ethernet connected
     to	interface.  Upon receiving a request, rarpd maps the target hardware
     address to	an IP address via its name, which must be present in both the
     ethers(5) and hosts(5) databases.	If a host does not exist in both data-
     bases, the	translation cannot proceed and a reply will not	be sent.

     By	default, a request is honored only if the server (i.e.,	the host that
     rarpd is running on) can "boot" the target; that is, a file or directory
     matching the glob /tftpboot/ipaddr* exists, where ipaddr is the target IP
     address in	hex.  For example, the IP address	will be
     replied to	if any of /tftpboot/CCD81B12, /tftpboot/CCD81B12.SUN3, or
     /tftpboot/CCD81B12-boot exist.  This requirement can be overridden	with
     the -s flag (see below).

     In	normal operation, rarpd	forks a	copy of	itself and runs	in the back-
     ground.  Anomalies	and errors are reported	via syslog(3).

     The following options are available:

     -a	     Listen on all the Ethernets attached to the system.  If -a	is
	     omitted, an interface must	be specified.

     -d	     If	-f is also specified, rarpd logs messages to stdout and	stderr
	     instead of	via syslog(3).

     -f	     Run in the	foreground.

     -P	     Specify the pathname of the PID file.  If not specified,
	     /var/run/	or /var/run/ will be used de-
	     pending on	the -a flag or the specified interface name.

     -s	     Supply a response to any RARP request for which an	ethernet to IP
	     address mapping exists; do	not depend on the existence of

     -t	     Supply an alternate tftp root directory to	/tftpboot, similar to
	     the -s option of tftpd(8).	 This permits rarpd to selectively re-
	     spond to RARP requests, but use an	alternate directory for	IP

     -v	     Enable verbose syslogging.



     Finlayson,	R., Mann, T., Mogul, J.C., and Theimer,	M., RFC	903: Reverse
     Address Resolution	Protocol, June 1984, 4 p.

     Craig Leres <> and	Steven McCanne <>.
     Lawrence Berkeley Laboratory, University of California, Berkeley, CA.

     The rarpd utility can depend on the DNS to	resolve	the name discovered
     from /etc/ethers.	If this	name is	not in the DNS but is in /etc/hosts,
     the DNS lookup can	cause a	delayed	RARP response, so in this situation it
     is	recommended to configure nsswitch.conf(5) to read /etc/hosts first.

BSD				 July 9, 2012				   BSD


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