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Wake on Wireless

Description

Wake on Wireless (WoWLAN) is a feature to switch on a computer via the network wirelessly.

Directory

Enable Wake on Wireless

Description

This details how to enable WoWLAN on our system.

References

Steps

  1. Check if WoWLAN is supported on your wireless interface using iw:

    iw list

    Sample entry showing that WoWLAN is supported:

            WoWLAN support:
                * wake up on disconnect
                * wake up on magic packet
                * wake up on pattern match, up to 1 patterns of 1-128 bytes,
                maximum packet offset 0 bytes
                * can do GTK rekeying
                * wake up on network detection, up to 10 match sets

    Do also note the first line of the output of iw list:

    Wiphy phy0

    The phy0 in the output of iw list indicates the name of the wireless interface.

  2. Check the status of WoWLAN on said interface (i.e. phy0):

    iw phy0 wowlan show

    Sample output:

    WoWLAN is disabled.

  3. If WoWLAN is not enabled, enable wake up on magic packet on said interface (i.e. phy0):

    sudo iw phy0 wowlan enable magic-packet

    Check the status of WoWLAN again:

    iw phy0 wowlan show

    Sample output after WoWLAN enablement:

    WoWLAN is enabled:
 * wake up on magic packet

    To make it persistent, create a wowlan@ systemd service:

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

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

    Then, start and enable the wowlan@ service for the wireless interface. Assuming the wireless interface is phy0, the service name would be wowlan@phy0.service.

  4. You can use iw to get the MAC address of your wireless interface:

    iw dev

    Sample output:

    phy#0
        Interface wlp4s0
                ifindex 3
                wdev 0x1
                addr 80:eg:f9:5f:06:28
                type managed
                channel 48 (5240 MHz), width: 80 MHz, center1: 5210 MHz
                txpower 3.00 dBm
                multicast TXQ:
                        qsz-byt qsz-pkt flows   drops   marks   overlmt hashcol tx-bytes        tx-packets
                        0       0       0       0       0       0       0       0               0

    From this example, the interface, phy0's, name is wlp4s0, and the MAC address is 80:eg:f9:5f:06:28.

Trigger a Wake on Wireless

Description

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

Important

This only works if the target system is connected to the same network wirelessly, and the target system's power is on (i.e. sleeping, not shutdown).

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