Why? Is it similar as the thread here? See my post. http://forum.tp-link.com/showthread.php?81027-How-to-use

If you can access internet directly and IP address obtained is private when connnecting directly to the ethernet cable given by your ISP, you can try to configure TD-W8901N as an access point. But if...

Model is TX-VG1530? ADSL light is always solid on, right? When you cannot access internet, login its web interface and check Status---WAN? Any IP address there? Can you provide the system log?

Refer to the post here. :) http://forum.tp-link.com/showthread.php?78963-Can-someone-post-their-settings-config-file-for-Archer-c7-v2-as-an-AP&p=156734&viewfull=1#post156734

WAN IP address is assigned by your ISP. If it is private indeed, contact your ISP. By the way, W9980 is working as a modem router or just a router which is working with another modem. private IP...

Eric, provide screenshots of Status---WAN and Diagnostic (press Start) page. To solve it quickly, I think you can call support in India directly. For Support in India (English & Hindi Service) Call...