I'm not into this but there's a fairly standard way of doing this. Look in Home Networking Forum where many instances appear.
It mainly involves switching off DHCP on the Modem/Router and ensuring its IP addy is out of range of the other router's DHCP. (or it might be the other way round).
EDIT: I hope the Belkin is not an ADSL modem and has Ethernet on the WAN side.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 19 Meg WBC
Edited by XRaySpeX (Sat 29-Sep-12 17:49:20)