This is a decent reference: http://en.wikipedia.org/wiki/Wake-on-LAN I wrote WoL code for cluster provisioning software earlier in my career. It is actually quite simple. So long as your motherboard/NIC support WoL and you have ACPI support then a simple "shutdown" will halt your OS but the NIC will still have power. The NIC is ready to receive the magic packet while in this state. You simply need to send the packet from anywhere else on the net (it could be sent over the Internet, it does not have to be on adjacent LAN) and the system will power up. Easy. I've used it on Centos 4.3 and I know it works there. There are tools out there that make it easy to send the packet (works just like ping) or you can write your own. -geoff --------------------------------- Geoff Galitz Blankenheim NRW, Germany http://www.galitz.org/ http://german-way.com/blog/ -----Original Message----- From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On Behalf Of Timothy Murphy Sent: Samstag, 4. April 2009 22:32 To: centos at centos.org Subject: [CentOS] Wake on LAN Has anyone experience with WOL under Centos (5.3).? If so, how exactly do you put the machine to sleep, and how exactly do you wake it up remotely?