Enable WOL in the operating system. When the OS shuts down, it sends signals that turn off all the hardware. The operating system is responsible for keeping network adapter powered on, so it may receive Magic Packet and power the system up. This section will describe how to enable this in Windows, Mac OS X and Linux. In the Apple OS X systems the Wake On LAN setting can be found in the System Preferences under the section Energy Saver. Microsoft Windows. On major Microsoft Windows OS the Wake On LAN is enabled by default so generally nothing to be done is needed.
Any change made with the ethtool program does not persist across reboots or network module (driver) reloads by default. Follow the steps given below to add the changes in such a way that they apply automatically at boot. Before setting the persistent options for ethtool, make sure you have the latest version of the package ‘initscripts‘.
1. Set the ETHTOOL_OPTS parameter in the interface’s ifcfg file found in the /etc/sysconfig/network-scripts/ directory. The network service scripts will run the ethtool program every time the interface is brought up. ethtool can be invoked multiple times by separating the values with a semicolon:
For example, the command :
will set the eth0 device to 100Mbs, full duplex, with the auto negotiation off. To have the initialization scripts set this every time the eth0 device is brought up, add a line to the /etc/sysconfig/network-scripts/ifcfg-eth0 like this:
Below is another exaple where you can set single option and multiple options persistently.
Here ${DEVICE} is the variable taken from the ifcfg configuration file, so you are not required to mention the actual device.
After enabling the Wake on LAN in the BIOSthe operating system must be informed to enable it before the shutdown otherwisethe machine will not turn on even if everything else is done properly.
To check if the network card supports the Wake On LAN then the following commandcan be used:
If the Supports Wake-on field contains g then the Wake On LAN bymagic-packet can be used:
The command must be performed before the machine shutdown.
In the Apple OS X systems the Wake On LAN setting can be found in theSystem Preferences under the section Energy Saver.
On major Microsoft Windows OS the Wake On LAN is enabled by default so generallynothing to be done is needed.If the machine still doesn’t turn itself on then you should check if theoperating system has the Wake On LAN enabled with the Magic Packet.
The following specifications can be different, they depends from the used driver.