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This function allows you a send a Wake-on-LAN signal (also known as a “magic packet”) to wired devices on your network to wake them up or power them on. Wake on LAN is generally not supported by wireless devices.
The list of devices on this menu includes:
dhcp-host=70:EE:50:37:E8:46,myhostnamein
Some devices might appear on this menu without their hostname defined/displayed. You can work around this by defining them manually in the Dnsmasq Custom configuration field, as described above.
There are two ways to send a magic packet to a device on your network:
For this function to work on your device, it must be configured to respond to magic packets, both in firmware and in software. Enabling the firmware option causes the device's Ethernet chip to remain powered on (usually at a low state, like 10 Mbps) even when the device is sleeping or powered off, so it can listen for magic packets. Enabling the software option allows the device to wake up or power on when the magic packet is received.
Regarding firmware, most PCs have a Wake-on-LAN option that must be enabled in the UEFI or BIOS, named something like:
Regarding software, the Wake-on-LAN settings in a PC's operating system also must be enabled. For details, see:
https://www.howtogeek.com/70374/how-to-geek-explains-what-is-wake-on-lan-and-how-do-i-enable-it/
https://docs.microsoft.com/en-us/troubleshoot/windows-client/deployment/wake-on-lan-feature