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Configure Ubuntu for Wake on Lan

Prerequisites

Remember that Wake on Lan must be supported on your network card, and you also must enable the required options inside your BIOS before setting up the OS.

How to quickly enable Wake on Lan on Ubuntu?

In comparison to Windows a thousand Wake on Lan options, Linux as always is super simple. For Debian like systems, you simply do the following:

  1. First, identify the NIC that is your Ethernet connection.
ip a

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp31s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether X:X:X:X:X:X brd ff:ff:ff:ff:ff:ff
    inet X.X.X.X/X brd X.X.X.X scope global dynamic enp31s0
       valid_lft 12699sec preferred_lft 12699sec

For this case, the enp31s0 is the NIC we are looking for.

  1. Install ethtool if you don't have it already:
sudo apt-get update
sudo apt-get install ethtool
  1. Then proceed with:
sudo ethtool enp31s0 # Your NIC name from 1 step

# Truncated output
Settings for enp31s0:
  Supports Wake-on: pumbg
  Wake-on: d  # here you can find different letters mostly g or d

d - disabled

g - enabled

If you see other letter than g, issue the below command:

sudo ethtool -s enp31s0 wol g # replace enp31s0 with yout NIC name

Then check again

sudo ethtool enp31s0 # Your NIC name from 1 step

And you should see Wake-on: g.

For some systems, it might be necessary to make this change after each boot, so google how to preserve it :). In our case for Ubuntu server 20.04 this was sufficient.