|Actually, you should be able to connect your combo device (combination modem/router/wireless AP) to your existing modem. Simply take the network patch cable from the existing modem and plug it into a LAN port on the router.|
Then all you have to do is correctly configure the LAN side of your router and it should work.
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.