if you are willing to wait, then you can do it that way, but the easiest way is to set the router to clone the mac address of the pc that was previously connected to the cyta modem..
Do it this way...
1. Plug pc into modem... when working double click the network icon in the system tray...
2. click support tab
3. click details button
4. write down the physical address
5. enter that address in the "clone this mac address" section of your routers configuration page
6. plug router into modem
voila