“DNS stands for Domain Name Server. When you type www.google.com, the DNS server converts the name into an IP address of Google. Then it follows the IP address to fetch you the webpage.
Now, due to a defective DNS server system, your typed address can not get resolved into IP. So you reach nowhere.”
SOLUTION (Simple) :
BSNL DNS is the root cause of the problem, so simply change it to DNS that works.
IMPLEMENTATION (Simpler) :
a) Double click the LAN icon on your system tray
b) Go to Properties > Click on Internet Protocol (TCP/IP)
c) Choose “Use the following DNS server addresses”
18.104.22.168 as preffered DNS server and
22.214.171.124 as alternate DNS server
These are provided by OPENDNS for public use.
e) You’re DONE