Wake on LAN
From the command line type;
etherwake <mac-address of device> or even moonID (for MD/PC's)
for more info. This will send a 'magic packet' to the device targeted and as long as that device has the bios & Network interface options to do WOL then you're in business. Obviously you could build some scripts to make this work more slickly and also trigger those scripts based on other events or even time of day etc etc.
Remember that etherwake will use eth0 by default which might not be your internal network. To use for example eth1 type
etherwake -i eth1 <mac-address of device>
Taken from the forum .