|Chances are you're just not configuring the Linksys router properly.|
If the motorola device is a combo unit like I think it is (ie: combination modem/router) then you need to configure your linksys to be part of the same subnet and connect from the motorola to a LAN port on the Linksys. For more detailed info, click on my name above and read my how-to guide on adding a second router. You'll want the same subnet scenario where you interconnect "LAN port to LAN port"
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.