Not only does China have powerful computers that scan Internet traffic for keywords that they find subversive, but they also have an enormous police force for it. They got poisoned entries that then spread all over the country and blocked Twitter, Facebook, and Youtube in the US. One American ISP accidentally set its servers to share with a Chinese server. DNS servers share information around the world to stay up to date. That “good citizen” website might track where you are so you get a visit from the police later.ĭNS cache poisoning is so effective that it once briefly expanded the Great Firewall. Now it goes to a website espousing the benefits of good citizenship and the necessity to follow the rules. ![]() So, for example, let’s say you go to a website called “.” The Chinese government, which controls the local DNS servers, might have changed the entry for that. This is a type of “spoofing” where an entry in a DNS server (the computer that connects website addresses to the IP addresses where they are hosted) is changed to send somebody elsewhere. They also engage in a process called DNS cache poisoning. Since most online sites have static IPs, meaning that they don’t change, they are effectively blocked unless they undergo the process of changing domain providers on a regular basis. This is a procedure where anyone based out of China cannot access websites that have certain IP addresses. ![]() The easiest and most common way that the Chinese government censors online content is through IP blocking. Get PrivadoVPN Types of Great Firewall Censorship IP Blocking
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