Set Wake-On-LAN in my BIOS and TrueNAS was stubbornly refusing to Wake when I sent a magic packet to it's MAC address.

After booting this is the output of ethtool showing Wake-On-LAN is disabled (Wake-on: d)

The following two scripts are installed to run as the system shutsdown

# cat /etc/systemd/system/wol_fix.service

[Unit]
Description=Fix WakeOnLAN being reset to disabled
[Service]
ExecStart=/bin/true
ExecStop=/root/wol_fix.sh
Type=oneshot
RemainAfterExit=yes
[Install]
WantedBy=multi-user.target

This logs an entry you can view with journalctl -t wol_fix or to the output of the unit use journalctl -u wol_fix

# cat /root/wol_fix.sh

#!/bin/bash

echo "Running wol_fix script to set WOL to enabled" | systemd-cat -t wol_fix

ethtool -s enp5s0 wol g

Remember to enable the service

systemctl daemon-reload
systemctl enable wol_fix.service
systemctl start wol_fix.service

Send a WOL packet to the TrueNAS box (do this from a computer or a

wakeonlan d8:5e:d3:da:f1:14