Kodama's home / tips. Wake On Lan(WOL) tool/class for Ruby Download: wakeonlan.rb. Wake On Lan(WOL) means to wake up or power on remote PCs with LAN access using Magic Packet technology. The Maic Packet is a broadcast packet containing MAC address of PCs. See Magic Packet for more details. We need a list of MAC address(or Ether address) to make Magic Packets. See "making a list of ether address".