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118 lines
3.4 KiB
Groff
118 lines
3.4 KiB
Groff
.\" @(#) $FreeBSD$ (LBL)
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.\"
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.\" Copyright (c) 1990, 1991, 1993 The Regents of the University of
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.\" California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that: (1) source code distributions
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.\" retain the above copyright notice and this paragraph in its entirety, (2)
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.\" distributions including binary code include the above copyright notice and
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.\" this paragraph in its entirety in the documentation or other materials
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.\" provided with the distribution, and (3) all advertising materials mentioning
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.\" features or use of this software display the following acknowledgement:
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.\" ``This product includes software developed by the University of California,
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.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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.\" the University nor the names of its contributors may be used to endorse
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.\" or promote products derived from this software without specific prior
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.\" written permission.
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.Dd July 19, 1993
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.Dt RARPD 8
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.Os
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.Sh NAME
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.Nm rarpd
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.Nd reverse ARP daemon
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.Sh SYNOPSIS
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.Nm
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.Op Fl afsv
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.Op Ar interface
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.Sh DESCRIPTION
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.Nm Rarpd
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services Reverse ARP requests on the Ethernet connected to
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.Ar interface .
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Upon receiving a request,
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.Nm
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maps the target hardware address to an IP address via its name, which
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must be present in both the
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.Xr ethers 5
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and
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.Xr hosts 5
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databases.
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If a host does not exist in both databases, the translation cannot
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proceed and a reply will not be sent.
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.Pp
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By default, a request is honored only if the server
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(i.e., the host that
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.Nm
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is running on)
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can "boot" the target; that is, a file or directory matching the glob
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.Pa /tftpboot/\fIipaddr\fP*
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exists, where
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.Em ipaddr
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is the target IP address in hex.
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For example, the IP address 204.216.27.18 will be replied to if any of
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.Pa /tftpboot/CCD81B12 ,
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.Pa /tftpboot/CCD81B12.SUN3 ,
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or
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.Pa /tftpboot/CCD81B12-boot
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exist.
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This requirement can be overridden with the
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.Fl s
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flag (see below).
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.Pp
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In normal operation,
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.Nm
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forks a copy of itself and runs in
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the background. Anomalies and errors are reported via
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.Xr syslog 3 .
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl a
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Listen on all the Ethernets attached to the system.
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If
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.Fl a
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is omitted, an interface must be specified.
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.It Fl f
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Run in the foreground.
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.It Fl s
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Supply a response to any RARP request for which an ethernet to IP address
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mapping exists; do not depend on the existence of
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.Pa /tftpboot/\fIipaddr\fP* .
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.It Fl v
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Enable verbose sysloging.
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.El
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.Sh FILES
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.Bl -tag -width /etc/ethers -compact
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.It Pa /etc/ethers
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.It Pa /etc/hosts
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.It Pa /tftpboot
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.El
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.Sh SEE ALSO
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.Xr bpf 4
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.Pp
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RFC 903: Finlayson, R.; Mann, T.; Mogul, J.C.; Theimer, M. Reverse Address
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Resolution Protocol. 1984 June; 4 p.
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.Sh AUTHORS
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.An -nosplit
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.An Craig Leres Aq leres@ee.lbl.gov
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and
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.An Steven McCanne Aq mccanne@ee.lbl.gov .
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Lawrence Berkeley Laboratory, University of California, Berkeley, CA.
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.Sh BUGS
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.Nm Rarpd
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can depend on the DNS to resolve the name discovered from
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.Pa /etc/ethers .
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If this name is not in the DNS but is in
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.Pa /etc/hosts ,
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the DNS lookup
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can cause a delayed RARP response, so in this situation it is reccommended to
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configure
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.Xr nsswitch.conf 5
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to read
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.Pa /etc/hosts
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first.
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