xref: /aosp_15_r20/external/iputils/doc/rarpd.sgml (revision bd1f8aeb6080fa6544ec30aeca3eb4da100f359f)

<refentry id="rarpd">

<refmeta>
<refentrytitle>rarpd</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo>iputils-&snapshot;</refmiscinfo>
</refmeta>

<refnamediv>
<refname>rarpd</refname>
<refpurpose>answer RARP REQUESTs</refpurpose>
</refnamediv>

<refsynopsisdiv>
<cmdsynopsis>
<command>arping</command>
<arg choice="opt"><option>-aAvde</option></arg>
<arg choice="opt">-b <replaceable/bootdir/</arg>
<arg choice="opt"><replaceable/interface/</arg>
</cmdsynopsis>
</refsynopsisdiv>

<refsect1><title>DESCRIPTION</title>
<para>
Listens
<ulink url="http://tools.ietf.org/rfc/rfc903.txt">RARP</ulink>
requests from clients. Provided MAC address of client
is found in <filename>/etc/ethers</filename> database and
obtained host name is resolvable to an IP address appropriate
for attached network, <command/rarpd/ answers to client with RARPD
reply carrying an IP address.
</para>
<para>
To allow multiple boot servers on the network <command/rarpd/
optionally checks for presence Sun-like bootable image in TFTP directory.
It should have form <userinput/Hexadecimal_IP.ARCH/, f.e. to load
sparc 193.233.7.98 <filename/C1E90762.SUN4M/ is linked to
an image appropriate for SUM4M in directory <filename>/etc/tftpboot</filename>.
</para>
</refsect1>

<refsect1><title>WARNING</title>
<para>
This facility is deeply obsoleted by
<ulink url="http://tools.ietf.org/rfc/rfc951.txt">BOOTP</ulink>
and later
<ulink url="http://tools.ietf.org/rfc/rfc2131.txt">DHCP</ulink> protocols.
However, some clients really still need this to boot.
</para>
</refsect1>


<refsect1><title>OPTIONS</title>

<variablelist>

 <varlistentry>
  <term><option/-a/</term>
  <listitem><para>
Listen on all the interfaces. Currently it is an internal
option, its function is overridden with <replaceable/interface/
argument. It should not be used.
  </para></listitem>
 </varlistentry>

 <varlistentry>
  <term><option/-A/</term>
  <listitem><para>
Listen not only RARP but also ARP messages, some rare clients
use ARP by some unknown reason.
  </para></listitem>
 </varlistentry>

 <varlistentry>
  <term><option/-v/</term>
  <listitem><para>
Be verbose.
  </para></listitem>
 </varlistentry>

 <varlistentry>
  <term><option/-d/</term>
  <listitem><para>
Debug mode. Do not go to background.
  </para></listitem>
 </varlistentry>

 <varlistentry>
  <term><option/-e/</term>
  <listitem><para>
Do not check for presence of a boot image, reply if MAC address
resolves to a valid IP address using <filename>/etc/ethers</filename>
database and DNS.
  </para></listitem>
 </varlistentry>

 <varlistentry>
  <term><option>-b <replaceable/bootdir/</option></term>
  <listitem><para>
TFTP boot directory. Default is <filename>/etc/tftpboot</filename>
  </para></listitem>
 </varlistentry>
</variablelist>
</refsect1>

<refsect1><title>SEE ALSO</title>
<para>
<link linkend="arping">
<citerefentry><refentrytitle/arping/<manvolnum/8/</citerefentry></link>,
<link linkend="tftpd">
<citerefentry><refentrytitle/tftpd/<manvolnum/8/</citerefentry></link>.
</para>
</refsect1>

<refsect1><title>AUTHOR</title>
<para>
<command/rarpd/ was written by
<ulink url="mailto:[email protected]">Alexey Kuznetsov
&lt;[email protected]&gt;</ulink>.
It is now maintained by
<ulink url="mailto:[email protected]">YOSHIFUJI Hideaki
&lt;[email protected]&gt;</ulink>.
</para>
</refsect1>

<refsect1><title>SECURITY</title>
<para>
<command/rarpd/ requires <constant/CAP_NET_RAW/ capability
to listen and send RARP and ARP packets. It also needs <constant/CAP_NET_ADMIN/
to give to kernel hint for ARP resolution; this is not strictly required,
but some (most of, to be more exact) clients are so badly broken that
are not able to answer ARP before they are finally booted. This is
not wonderful taking into account that clients using RARPD in 2002
are all unsupported relic creatures of 90's and even earlier.
</para>
</refsect1>

<refsect1><title>AVAILABILITY</title>
<para>
<command/rarpd/ is part of <filename/iputils/ package
and the latest versions are  available in source form at
<ulink url="http://www.skbuff.net/iputils/iputils-current.tar.bz2">
http://www.skbuff.net/iputils/iputils-current.tar.bz2</ulink>.
</para>
</refsect1>

<![IGNORE[
<refsect1><title>COPYING</title>
<para>
<literallayout>
This documentation is free software; you can redistribute
it and/or modify it under the terms of the GNU General Public
License Version 2.

This program is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.

For more details see the file COPYING in the source
distribution of Linux kernel of version 2.4.
</literallayout>
</para>
</refsect1>
]]>




</refentry>