I'm not familiar with your particular router, but if you can, disable DHCP on the second one & don't use the WAN port; set the router's LAN IP address to something outside your LAN's address space. The idea here is to disable the router facility and just use the switch (hub) portion, and not have the router interfere with your network operation. you only need one router in the mix, and one DHCP server.
To connect the two routers together, you'll need to use the uplink port on one of them, unless they're autosensing (none are that I've seen). Failing that, you'd need a crossover cable, the ethernet equivalent of a nullmodem cable :-) Hope this helps...
