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

NAME

     rarpd -- reverse ARP daemon

SYNOPSIS

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

DESCRIPTION

     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
     204.216.27.18 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 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 syslog(3).

     -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.

FILES

     /etc/ethers
     /etc/hosts
     /tftpboot
     /var/run/rarpd.pid

SEE ALSO

     bpf(4)

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

AUTHORS

     Craig Leres <leres@ee.lbl.gov> and Steven McCanne <mccanne@ee.lbl.gov>.  Lawrence Berkeley Laboratory, University of California, Berkeley,
     CA.

BUGS

     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