To set up 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 pick it off the initial OpenPROM boot messages, use the OpenBoot .enet-addr command, or boot into Rescue mode and use the command ip addr show dev eth0. On a RARP server system using a Linux kernel or Solaris/SunOS, you use the rarpd program. You need to ensure that the Ethernet hardware address for the client is listed in the ethers database (either in the /etc/ethers file, or via NIS/NIS+) and in the hosts database. Then you need to start the RARP daemon. Issue the command (as root): /usr/sbin/rarpd -a on most Linux systems and SunOS 5 (Solaris 2), /usr/sbin/in.rarpd -a on some other Linux systems, or /usr/etc/rarpd -a in SunOS 4 (Solaris 1).