TP-LINK ADSL2 Modem Router as WLAN access point. The images of the Interface setup settings- guide for Internet Setting, LAN setting and Wireless Settings are shown below as separate images.
Configuration : TP-LINK Wireless ADSL2 Modem Router (TD-W8961ND) : Interface Setup > Internet Settings (works)

Alternate configuration : TP-LINK Wireless ADSL2 Modem Router (TD-W8961ND) configuration : Interface Setup > Internet Settings (This also works)

- View a Youtube video : http://www.youtube.com/watch?v=HeN7xV29pbA
- BSNL Broadband wireless router / adsl modem configuration
- The best guide to install a TP-LINK TD-W8961ND ADSL2 Modem Router and configuration/ settings details here in PDF.