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Wake on LAN

Description

Wake-on-LAN (WoL) is a feature to switch on a computer via the network.

Directory

References

Enable Wake on LAN

Description

This details how to enable WoL on our system.

References

Hardware Preparation

  1. Check if your motherboard supports WoL and how to enable it.

  2. In general, head to the motherboard's BIOS and enable WoL:

    • Click the Advanced tab.

    • Select APM Configuration.

    • Under Power On By PCIE, select Enabled.

    • Press the F10 key to save and exit the BIOS.

    [!NOTE]
    In some cases, you may need to also disable ERP if it was enabled by default by the motherboard.

Software

  1. Get the name of your network interface and its MAC address:

    ip addr show

    This will return several results/interfaces on our system, including virtual ones. We are interested in the physical interface which connects us to the network.

    In most cases, it is the second interface returned. For example:

    2: enp7s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 80:eg:f9:5f:06:28 brd ff:ff:ff:ff:ff:ff
inet 192.168.0.125/24 brd 192.168.0.255 scope global noprefixroute enp7s0
   valid_lft forever preferred_lft forever

    From this example, the interface name is enp7s0, and the MAC address is 80:eg:f9:5f:06:28.

  2. Use ethtool to check if WoL is supported/enabled:

    sudo ethtool enp7s0 | grep "Wake-on"

    Sample output:

            Supports Wake-on: pumbg
        Wake-on: g

    The g in the output of Supports Wake-on indicates that WoL is supported, and the g in the output of Wake-on indicates that WoL is enabled.

  3. If WoL is not enabled, enable it on said interface (i.e. enp7s0):

    ethtool -s enp7s0 wol g

    To make it persistent, either create a wol@ systemd service or install the wol-systemd package on Arch Linux based systems.

    Create a wol@.service systemd service:

    sudo nano /etc/systemd/system/wol@.service

    Copy the content of the sample wol@.service file, paste it into the service file you created, and save it.

    Alternatively, install the wol-systemd package from the AUR using yay.

    Lastly in either options, start and enable the wol@ systemd service for the network interface. Assuming the network interface is enp7s0, the service name would be wol@enp7s0.service.

Trigger a Wake on LAN

Description

This details how to trigger WoL on a system from another system.

Important

This only works if the target system is connected to the same network (via Ethernet) as the system you are triggering the WoL from.

Steps

  1. Install the wakeonlan package using yay.

    It is also available on homebrew for macOS:

    brew install wakeonlan

  2. Run the wakeonlan command with the MAC address of the target system that you wish to wake (i.e. 80:eg:f9:5f:06:28):

    wakeonlan 80:eg:f9:5f:06:28