This is unfortunate, since broadcasts aimed at a specific device (unicast) appears more secure than subnet-directed broadcast. This technique does seem to be required for some devices to work with WOL. Note : As of version 1.2, miniWOL supports subnet directed broadcasting. Naturally, you can guess that this is not 100% fool proof, but it’s better than nothing, and in your local network (at home or in the office) this might be safe enough. To prevent that just anything can wake up such a network device, a very specifically formatted “magic packet” has to be send over the network. Normally just one single packet should do the trick, but most Wake On Lan applications actually send more than one packet – just to make sure.
The Magic Packet ( UDP) is typically send to port 9, some systems default to port 7, and some systems allow you to define your own port number.
