Well, I can't answer for how to do this if the D-Link is your primary router.
D-Link has NO information on cascading additional switches to the router.
I know that you can cascade additional switches onto the BEFSR41, as I am doing this myself.
On the Linksys, you connect the WAN port on the second switch (router) to the first (number 1) LAN port.
On the second router, just disable / bypass most of the router features.
A simple switch / hub can be found for under $20 (US), and would be all you would need in the form of additional hardware.
This would avoid any configuration issues with the router in either the D-Link or the Linksys routers.
Chas