to access modem page pc/laptop ip must be in the same range i.e.ip 192.168.1.x & gateway 192.168.1.1.you may need to manually set the ip but write down any setting before you change it.
use imgur,forum attachment function is broke.in adsl modem use mac clone/spoof feature to set modem mac address to desktop mac address 94-DE-80-B0-D6-C0.once it is done connect incoming net cable to one of the lan port & connect pc to another lan port.dial connection from pc as usual & it should work.
*www.tp-link.com/resources/software/20113821345217.pdf
see section 4.3.2 on mac spoofing.also see section 4.3.1 on internet connection type.there select connection as pppoe(leave other values as default),enter username/password,select ip as static & enter details from ipconfig result above(IPv4 Address : 10.1.190.20(Preferred),Subnet Mask : 255.255.255.0,Default Gateway : 10.1.190.1).
And if I'll change it will I be able to use MTNL broadband ?.
I have changed everything as you said other than the mac address (mac clone/spoof feature thing). I don't know but I cant understand about this from the modem manual you provided. So can you please enligthene me about this thing specially. Other than this everything is set.
Currently the modem+router is acting like a switch, i.e. Internet on my PC is working fine (Ethernet cable is connected to one lan port, and a line wire connects Modem to my PC), but the router functionality is not working, ie Internet cannot be accessed on mobile devices.
Yes, indeed.
Also, you can't use MTNL with same settings, you will have to modify the settings required for MTNL.
Nothing seems to be wrong as far as I can see. I'll suggest you to reset your router first then set up the settings from scratch.
What should be VPI and VCI in this case?
then try encapsulation--static ip option instead of pppoe with static ip for hathway.also i don't see mac cloning/spoofing option in these screenshots.