Enable Wake on LAN in BIOS
Add kernel option 'acpi=on' (to poweroff properly)
Add module option 'enable_wol=1' for module 3c59x in /etc/modutils/options
Add MAC addresses to /etc/ethers
apt-get install etherwake wakeonlan
Poweroff machine with 'poweroff' or 'shutdown -h now'
Poweron machine with 'etherwake <MAC>' or 'etherwake <host>' as root from remote
Or poweron machine with 'wakeonlan -i 192.168.1.255 <MAC>' as normal user from remote
http://support.dell.com/support/edocs/systems/ws340/en/ug/setup.htm#1104340
http://packages.debian.org/stable/net/etherwake
http://www.scyld.com/wakeonlan.html
http://gsd.di.uminho.pt/jpo/software/wakeonlan/mini-howto/
http://www.amd.com/us-en/ConnectivitySolutions/TechnicalResources/0,,50_2334_2481,00.html