Windows 7: Turning on pc from internet

I can turn on a pc from another machine on the same home network, but can not from the Internet.
I am doing this Wake-On-WAN experiment at home by using two machines each connected to the Internet through different ISP.

The problem must be somewhere in the BIOS or the router setting for the machine to be turned on.
I reviewed the BIOS and found the relevant option was enabled by default. As for the router(D-Link DIR 655), I set the portforwarding for the machine with a arbitrary port number assigned. I did not see anything else relevant but I might have missed something.



To send the magic packet, I am using depicus GUI. I also tried one at dslreports website.

Any suggestion is appreciated.

Dslreports says
If you are on DSL, it may be useful to wake your PC up from a remote location. All you need do is specify your IP address, and your MAC address. These can be found by using winipcfg command for windows, or ifconfig for Linux. Some Macs display the MAC address on a sticker.


Are you on DSL?

You'll also need to forward port 9 UDP through your router to the workstation in question, per the instructions.

Thanks everyone for your responses.
The machine to be turned on is connected to, if awoken, to the Internet through the ISP by Comcast, and the machine to send the magic packet is connected by the ATT's dsl. I do not think it matter how the machine is connected to the Internet.
I assigned 9 for the UDP port in order to use the magic packet sender at dslreports' website.