based on your setup. you dont need to configure your belkin as router anymore coz its already configured in the modem.

you have options in order to work.
1. connect the WAN port of your belkin to the LAN port of your qtel modem and set the WAN as DHCP.

2. if you want to use your belkin as modem/router. change the mode of the modem to Bridge mode.
3. or remove the modem just use the belkin only and configure as PPPoE.you should know the VPI and VCI default value of qtel.usually 8 and 35..and also the encapsulation. and usually PPPoE LLC.

any assistance , call me 66650191 .ill fix it for you. no fix no pay