Wake up on LAN (WoL) is a technology that allows a computer to be turned on remotely over a network. This feature is particularly useful for network administrators who need to access computers without physical access to them. In this article, we will discuss how to set up Wake up on LAN on a Linux system.

To enable Wake up on LAN on a Linux system, you will need to make sure that your network card supports this feature. Most modern network cards support WoL, but you may need to check the specifications of your specific card to be sure.

The first step to setting up Wake up on LAN is to enable the feature in your BIOS. To do this, you will need to restart your computer and enter the BIOS settings. Look for an option that allows you to enable Wake on LAN or Power on by PCI Devices. Once you have enabled this option, save your changes and exit the BIOS.

Next, you will need to install the ethtool package on your Linux system. Ethtool is a command-line utility that allows you to view and configure network interface settings. You can install ethtool on most Linux distributions using the package manager. For example, on Ubuntu, you can run the following command:

```
sudo apt-get install ethtool
```

Once ethtool is installed, you can use it to check the Wake on LAN settings for your network card. Open a terminal and run the following command:

```
sudo ethtool eth0
```

Replace "eth0" with the name of your network interface if it is different. Look for a line that says "Wake-on" followed by a list of supported modes. If "g" is listed, it means that Wake up on LAN is enabled for your network card.

If Wake up on LAN is not enabled, you can use ethtool to enable it by running the following command:

```
sudo ethtool -s eth0 wol g
```

Again, replace "eth0" with the name of your network interface if it is different. This command will enable Wake up on LAN for your network card.

Once you have enabled Wake up on LAN, you will need to configure your router to forward WoL packets to the correct computer. This typically involves setting up a port forward for UDP port 9, which is the port used for Wake on LAN packets. Consult your router's documentation for instructions on how to set up port forwarding.

With Wake up on LAN set up on your Linux system, you can now remotely turn on your computer using WoL packets. This can be done using a WoL tool or app on another device connected to the same network. Simply enter the MAC address of the computer you want to wake up and send the WoL packet.

In conclusion, Wake up on LAN is a convenient feature that allows you to remotely turn on a computer over a network. By following the steps outlined in this article, you can set up Wake up on LAN on a Linux system and enjoy the benefits of remote access to your computer.