DNS Bypass

DNS Bypass

Tuesday, July 19th, 2011

A DNS (Domain Name System) Bypass is a technique applied by computer users when there are restrictions imposed by the internet service provider for its users in accessing the internet. This is where one needs to know what options to change in the settings level especially when the browser is pointed at a certain public server. This means that you will need to have knowledge of what IP addresses are which typically is a location of a server.

A situation surfaced recently when the MCMC (Malaysian Commission for Multimedia and Communications) imposed a ban on certain file sharing websites which they deemed to be providing illegal file sharing services. Hence a directive was issued to the local ISPs to filter people accessing the sites. What the ISPs did was to filter some sites by blocking the DNS of the pages.  Here is how it works, in simple terms, a website is matched to an IP address which is hard to remember (imagine 172.12.12.134 which means google.com). So the DNS is used like a reference point that matches the number with the name.

So if you type the name, it gets to the DNS and matches the numbers. DNS blocking is where the request is blocked before it gets matched. DNS Bypass is where instead of using the ISP’s server, you use a different DNS address. Here is where you can insert 8.8.8.8 on the DNS server under your browser’s settings function which is Google’s DNS server. The Settings are:
Preferred DNS server: 8.8.8.8
Alternate DNS server: 8.8.4.4

OpenDNS Server
Preferred DNS server: 208.67.222.222
Alternate DNS server: 208.67.220.220

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