|It could be your provider has registered the MAC address of your computer to that connection. If this is the case, you can "spoof" your computer's network interface MAC address on your router. At least, most of the modern routers I've worked with allow you to change the WAN MAC.|
To find out your computer's NIC MAC, open a command prompt window (ie: Start >> Run >> type cmd and hit enter) and perform the following command:
Once you do that, you should see an entry "physical address". That's your NIC's MAC address, that's the one to use in your router.
Oh and regarding that MAC, for some odd reason, Microsoft decided to use a dash "-" between number sets whereas everyone else in the world uses a colon ":". When you go to enter that address in your router, use a colon.
If spoofing your computers MAC doesn't work, call your provider. They can help you.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.