You could also try to use a smaller subnet/range. My router won't allow to forward a port to 192.168.0.255, but I changed the subnet mask to 255.255.255.224 and so the range is from 192.168.0.1 to 192.168.0.30 with 192.168.0.31 being the broadcast address for that range and which I can forward the needed port to.
You can use a subnet calculator if you need more or different IP addresses (do a search for subnet masks on google)
Least router input work ?? You have to setup your router/computer the same, the program just takes the public IP address, MAC address and port and sends a packet which is the same for both.
I would say WOL everywhere is more complete but this app here is more straightforward if you need it for only one computer...