BSNL Cannot access certain websites like Waiting for

Confused when you gets almost all websites ligning fast and certain websites just hangsup and never loads, I had came across this issue erlier and fixed up after playing with my modem MTU setting for a while, now after my bro reset my ADSL 2+ Router I got this issue pop up again.
Ususally thiis behavious arises when you have an incompatible MTU setting, you can give a try with MTU ping test which is explained well here