social networks, political/religious content, pornography, piracy sites, etc.). Blocking sites: Especially in the last couple of years, many governments all over the world have used DNS forgery/spoofing to block access to various kind of Internet content (e.g.The two most prominent ones are to block access to a site or service, or to eavesdrop the connection using a man-in-the-middle attack (MITM). There are multiple reasons for wanting to reroute traffic. the connection is rerouted to a destination of your choice. In short, before you can connect to “”, you first need to know its IP address.Īnd because machines blindly connect to the IP address returned by the DNS server, being able to forge specific (or all) of its entries means that the client connects to a different server – i.e. Before a machine can connect to another machine and start the actual communication, a DNS request must resolve the name of the destination machine. Even though it sounds like a very simple task, this translation carries a great responsibility because it is an essential step to make communication between most machines even possible. Blocking content / Internet censorshipĭNS is responsible for managing the Internet’s namespace of domains by translating domain names into IP addresses.
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