===== Enable Wake-on-LAN persistent =====

<callout type="info" icon="true">This guide was tested on Ubuntu 22 and Debian 11/12.</callout>

==== Check current setting and enable manually ====
Firstly find out the interface on which WoL should be enabled. Therefore use ''ifconfig'' that is shipped with the ''net-tools''-package on Debian/Ubuntu:
<code bash>ifconfig</code>

Your output may look like this:
<code bash>
enp1s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.2  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::ed26:e33:5d38:2468  prefixlen 64  scopeid 0x20<link>
        ether xx:xx:xx:xx:xx:xx  txqueuelen 1000  (Ethernet)
        RX packets 138808  bytes 178312866 (178.3 MB)
        RX errors 0  dropped 3324  overruns 0  frame 0
        TX packets 70435  bytes 59140948 (59.1 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
	[...]

wlp2s0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether xx:xx:xx:xx:xx:xx  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
</code>

Then check the current Wake-on-LAN-state with ''ethtool''. (Package to install has the same name):
<code bash>sudo apt install ethtool</code>
<code bash>ethtool <interface></code>
Replace ''<interface>'' for examle with ''enp1s0'', if this is the ID of your interface.


The output may now look like this:
++++ Show/Hide |
<code bash>
Settings for enp1s0:
        Supported ports: [ TP    MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                             100baseT/Half 100baseT/Full
                                             1000baseT/Full
        Link partner advertised pause frame use: No
        Link partner advertised auto-negotiation: Yes
        Link partner advertised FEC modes: Not reported
        Speed: 1000Mb/s
        Duplex: Full
        Auto-negotiation: on
        master-slave cfg: preferred slave
        master-slave status: slave
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: external
        MDI-X: Unknown
        Supports Wake-on: pumbg
        Wake-on: d
        Link detected: yes
</code>
++++

Important are the following lines:
<code bash>
        [...]
        Supports Wake-on: pumbg
        Wake-on: d
	[...]
</code>
If the line ''Supports Wake-on:'' contains **''g''**, then Wake-on-LAN ist supported. 

If the line ''Wake-on:'' already says ''Wake-on: g'', then WoL is already enabled, if not, you can enable it with:
<code bash>sudo ethtool -s <interface> wol g</code>

==== Enable automatically at boot ====

If not enabled in BIOS WoL has to be enabled before shutting down. This can be done by a system service:

Firstly create the service file:
<code bash>sudo nano /etc/systemd/system/wol-enable.service</code>
And add this content: 
<code bash>
[Unit]
Description=Configure Wake-up on LAN
After=network-online.target

[Service]
Type=oneshot
ExecStart=/sbin/ethtool -s <interface> wol g

[Install]
WantedBy=basic.target
</code>
Remind to change the ''<interface>''.

Then save the file and enable the service with:
<code bash>sudo systemctl enable wol-enable.service</code>

// Sourced from [[https://wiki.ubuntuusers.de/Wake_on_LAN/|wiki.ubuntuusers.de]]//