[Resolved]  BSNL Broadband — Routing problem

I'm having BSNL broadband connection. Most of the links are not opening, it says address not found, check your DNS server. I checked all my settings in my side, it is fine. There is a problem in routing, bsnl should take action on this to check as soon as possible. What is the use of having broadband connection when nothing is opening. Please resolve this at the earliest.