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<sect2 condition="supports-rarp" id="tftp-rarp">
<title>Setting up RARP server</title>
<para>
To setup RARP, you need to know the Ethernet address (a.k.a. the MAC address)
of the client computers to be installed.
If you don't know this information, you can
<phrase arch="sparc"> pick it off the initial OpenPROM boot messages, use the
OpenBoot <userinput>.enet-addr</userinput> command, or </phrase>
boot into <quote>Rescue</quote> mode (e.g., from the rescue floppy) and use the
command <userinput>/sbin/ifconfig eth0</userinput>.
</para><para>
On a RARP server system using a Linux 2.2.x kernel,
you need to populate the kernel's RARP table.
To do this, run the following commands:
<informalexample><screen>
# <userinput>/sbin/rarp -s
<replaceable>client-hostname</replaceable>
<replaceable>client-enet-addr</replaceable></userinput>
# <userinput>/usr/sbin/arp -s
<replaceable>client-ip</replaceable>
<replaceable>client-enet-addr</replaceable></userinput>
</screen></informalexample>
If you get
<informalexample><screen>
SIOCSRARP: Invalid argument
</screen></informalexample>
you probably need to load the RARP kernel module or else recompile the
kernel to support RARP. Try <userinput>modprobe rarp</userinput> and
then try the <command>rarp</command> command again.
</para><para>
On a RARP server system using a Linux 2.4.x kernel,
there is no RARP module, and
you should instead use the <command>rarpd</command> program. The
procedure is similar to that used under SunOS in the following
paragraph.
</para><para>
Under SunOS, you need to ensure that the Ethernet hardware address for
the client is listed in the <quote>ethers</quote> database (either in the
<filename>/etc/ethers</filename> file, or via NIS/NIS+) and in the
<quote>hosts</quote> database. Then you need to start the RARP daemon.
In SunOS 4, issue the command (as root):
<userinput>/usr/etc/rarpd -a</userinput>; in SunOS 5, use
<userinput>/usr/sbin/rarpd -a</userinput>.
</para>
</sect2>
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