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FreeBSD 11.0 - man page for rarpd (freebsd section 8)

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 databases, 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

     In normal operation, rarpd forks a copy of itself and runs in the background.  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

     -f      Run in the foreground.

     -P      Specify the pathname of the PID file.  If not specified, /var/run/rarpd.pid or
	     /var/run/rarpd.ifname.pid will be used depending 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 /tftpboot/ipaddr*.

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

     -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 <leres@ee.lbl.gov> and Steven McCanne <mccanne@ee.lbl.gov>.  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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