OpenBSD-4.6/usr.sbin/rarpd/rarpd.8

.\"	$OpenBSD: rarpd.8,v 1.17 2008/05/23 15:23:53 sobrado Exp $
.\"	$NetBSD: rarpd.8,v 1.7 1998/04/15 15:06:06 mrg Exp $
.\"
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.\" @(#) $Id: rarpd.8,v 1.17 2008/05/23 15:23:53 sobrado Exp $
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.Dd $Mdocdate: May 23 2008 $
.Dt RARPD 8
.Os
.Sh NAME
.Nm rarpd
.Nd reverse ARP daemon
.Sh SYNOPSIS
.Nm rarpd
.Op Fl adflt
.Ar interface
.Sh DESCRIPTION
.Nm
services Reverse ARP requests on the Ethernet connected to
.Ar interface .
Upon receiving a request,
.Nm
maps the target hardware address to an IP address via its name, which
must be present in both the
.Xr ethers 5
and
.Xr hosts 5
databases.
If a host does not exist in both databases, the translation cannot
proceed and a reply will not be sent.
.Pp
In normal operation,
.Nm
forks a copy of itself and runs in the background.
Anomalies and errors are reported via
.Xr syslog 3 .
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl a
Listen on all the Ethernets attached to the system.
If
.Fl a
is omitted, an
.Ar interface
must be specified.
.It Fl d
Run in debug mode, with all the output to stderr.
This option implies the
.Fl f
option.
.It Fl f
Run in the foreground.
.It Fl l
Log all requests to
.Xr syslog 3 .
.It Fl t
Only honour a request if the server
(the host that
.Nm
is running on)
can "boot" the target; that is, if a file or directory called
.Pa /tftpboot/ipaddr
exists, where
.Pa ipaddr
is the target IP address expressed in uppercase hexadecimal
(only the first 8 characters of filenames are checked).
.El
.Sh FILES
.Bl -tag -width "/var/run/rarpd.pidXXX" -compact
.It Pa /etc/ethers
Ethernet host name database.
.It Pa /etc/hosts
Host name database.
.It Pa /var/run/rarpd.pid
Process ID of
.Nm .
.\" .It Pa /tftpboot
.El
.Sh SEE ALSO
.Xr bpf 4 ,
.Xr diskless 8
.Rs
.%R A Reverse Address Resolution Protocol
.%N RFC 903
.%A Finlayson, R.
.%A Mann, T.
.%A Mogul, J.C.
.%A Theimer, M.
.Re
.Sh AUTHORS
Craig Leres (leres@ee.lbl.gov) and Steven McCanne (mccanne@ee.lbl.gov).
Lawrence Berkeley Laboratory, University of California, Berkeley, CA.