Wake-on-LAN (o WOL) es un estándar por el cual una máquina se puede encender de forma remota a través de una conexión de red. Esto se hace enviando un llamado magic packet a la tarjeta de red de la máquina remota. Cuando se configura correctamente, la máquina remota arrancará.

La opción Wake-on-LAN debe estar habilitada en el BIOS. Lamentablemente estas configuraciones no están estandarizadas. Compruebe la documentación de la placa base. Navega por el menú del BIOS. Es posible que la opción no se llame Wake-on-LAN, sino algo como 'Encender por dispositivo PCI'. Esto varía mucho de una tabla a otra y puede ser necesaria alguna experimentación.

Assuming the first network port is connected, use ethtool to check the card settings:

# ethtool eth0 | grep -i wake-on
    Supports Wake-on: pg
	Wake-on: d

The supports line shows all options that are supported on the card. The option to look for is g, which means wake on magic packet. If the g option is not present, you are out of luck.

The Wake-on line shows the current options in use. If this shows d, it means wake-on is currently disabled.

To enable wake-on, use

# ethtool -s eth0 wol g

This will most likely not survive a reboot, so to switch this option on again at the next boot, add the command to /etc/rc.d/rc.local:

rc.local

echo "Setting Wake-on-LAN to Enabled"
/usr/sbin/ethtool -s eth0 wol g 

Finally, we need to note the MAC address of the network card we just prepared:

# ip addr show eth0 | grep -i ether 
    link/ether 20:cf:30:1f:e3:a4 brd ff:ff:ff:ff:ff:ff

Now we need a special command on a different machine to send a magic packet. The wol command is available from slackbuilds.org. This can be called by a regular user. At a minimum it needs the MAC address of the remote machine; for example:

$ wol 20:cf:30:1f:e3:a4

On a multihomed host, like a router, use the host option to specify the hostname or ip address of the remote host. This will broadcast the magic packet on the correct subnet:

$ wol -i hostname 20:cf:30:1f:e3:a4

• Originally written by Frank Donkers