when you applied for an Internet connection at the ISP, The have configured your computer to browsethrough their own Domain Name System (DNS) and made it the default way to access Internet Sites.When you access a blocked site on the ISPs DNS, the request is nulled or redirected to a preconfigured page like This Webpage is Blocked etc.

The Solution to DNS Blocking.

Bypassing DNS Blocking is very easy and even a non-tech savvy user will be able to perform it. Wewill be using either of these 3 DNS OpenDNS/GoogleDNS/ComodoSecureDNS. Here is how itsdone,

These instructions are mainly crafted for Windows 7 but except the navigation to different parts, Allthe rest steps remain same.

Step 1. Open Network and Sharing Center (Control Panel\Network and Internet\Network and SharingCenter).

Step 2. Click on Change Adapter Settings. Right click on your Main Adapter > Properties.

Step 3. Click on IPv4 or IPv6 according to your connection > Properties.

Step 4. Change the Preferred DNS server and Alternate DNS Server as follows for the respectiveDNSs.

For Google DNS:

Preferred DNS: 8.8.8.8

Alternate DNS: 8.8.4.4

For Open DNS:

Preferred DNS: 208.67.222.222

Alternate DNS: 208.67.220.220

For Comodo SecureDNS:

Preferred DNS: 156.154.70.22

Alternate DNS: 156.154.71.22

Step 5. Save the Changes.

That is it, Now just perform a (Optional) Reboot and DNS Flush. Run Command Prompt asAdministrator and run the following commands.

ipconfig/flushdns followed by ipconfig/registerdns

hope this helps have a nice day x