avoid malicious DNS replies – when connected to (unknown/obscure) wireless networks (and not only) there is a high chance of being directed to a different website than the one written in the address bar of your browser.to bypass the restrictions on certain networks – i’ve encountered networks, where upon bandwidth abuse (or similar activities) the user is banned from using the DNS.A quick example is (infamous) PirateBay.Org, which in Denmark is blocked by the major ISP, as you can see in the picture below, displayed when trying to access it: to access websites that your ISP is probably blocking (frequent case in countries where the goverment enforces strict policies on the internet service providers).In my case, i’m using my wireless network (wlan0) : Now restart your internet connection so that the changes may apply. You can probably understand better from the screenshot below: Next i’ve commented the domain-name, domain-name-servers, domain-search, host-name, so that my PC is not requesting any DNS from the DHCP server, and replaced it with domain-name, domain-search, host-name, I’ve added the line stating the custom DNS servers (in this example i’m using Google’s public DNS servers, for more, read below) How to change your DNS servers from the command line in Ubuntu 12.04 (earlier/later versions may apply) In earlier versions, this has been done by modifying the nf file, but now it’s done by modifying the nf file. This assumes that you have a general idea about DNS, if not do a quick Google search on it. On Ubuntu 12.04, I’ve been looking on how to change the DNS servers withouth using the ones appointed by the DHCP server.
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