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Wake-on-Lan (or WOL) is a power management feature allowing a server to be switched on or awakened from another server via a network message.

Wake-on-Lan is available on all microservers (all five base variations).

The option "Wake On LAN" only needs to be enabled in the BIOS (no firmware upgrade required).

LinuxEdit

On the local host:Edit

To set it up on GNU/Linux operating systems, instructions can be found in the following threads:

If the above does not work, i.e. ethtool reports all should be working but still no WOL, you may also need to set some paramters for ACPI:

echo PCE6 > /proc/acpi/wakeup

Running this before shutdown should leave it enabled. For example, on Centos 6.4 (x86_64):

  • you have to copy the following lines into the /etc/init.d/wakeonlan file as root:
## Calomel.org -- Wake On LAN for Linux
## /etc/init.d/wakeonlan
#
# chkconfig: 2345 99 99
# description: Force NIC into WOL mode
#
ethtool -s eth0 wol umbg
exit
  • then, activate the script as root:
# chmod 755 /etc/init.d/wakeonlan
# chkconfig --add wakeonlan

On the client:Edit

From another GNU/linux operating system server, to wake up a server via WOL, install the following package:

  • net-tools on Centos/RHEL (in this case, use the ether-wake command instead of etherwake),
  • etherwake on Debian/Ubuntu.

then run as root: # etherwake -i interface macAddress

This command sends a "magic packet" through the specified network interface with the macAddress of the server to wake up.

WindowsEdit

Wake-on-Lan can be enabled from the network adapter properties dialog box (after being enabled in BIOS).

To turn Wake-on-Lan on (using Windows 7):

  • Open the Network and Sharing Center by clicking the Start button and typing "network and sharing", press Enter.
  • Click the Change adapter settings link in the left pane.
  • Right click the network connection (in this case Broadcom NetXtreme Gigabit Ethernet) and click Properties.
  • Click Configure.
  • Select the Power Management tab from the ribbon menu.
  • Check the Allow this device to wake the computer checkbox.

If you would like to use a Software package to control Wake on Lan on your Windows PC, grab one of these wake-on-lan software packages (open-source & free) and install on your windows machine as needed. This will enable WOL automatically rather than you configuring manually.

Based on the TechNet Power Management article.

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