![]() ![]() There’s another protocol that also aims to encrypt DNS queries. I think if you are paranoid about privacy, you should run your own DoH resolver, so neither Cloudflare nor your ISP can spy on you. ![]() They seem to have more trust in their ISP than Cloudflare. However, some folks argue that this allows Cloudflare to gather information on Firefox users. Firefox uses Cloudflare resolvers (1.1.1.1) by default. Starting with Firefox version 61, you can enable DNS over HTTPS in the browser settings, which is big progress for Internet security and privacy. There are already some public DNS resolvers like 1.1.1.1 and 9.9.9.9 that support DNS over HTTPS, so you can use them if you don’t have the skill or time to run your own. With DNS over HTTPS (DoH), your DNS queries will be encrypted and no third party can see your DNS query. HTTPS is the standard way to encrypt plain text HTTP connections. Then the DNS resolver returns the bogus IP address to the user’s computer, so the user cannot visit. For instance, if a Chinese Internet user wants to visit, GFW returns an IP address located in China instead of Google’s real IP address, to the user’s DNS resolver. When GFW finds a domain name on its block list, it changes the DNS response. Since plain text DNS protocol is based on UDP, which is a connection-less protocol, GFW can spoof both the client IP and server IP. GFW checks every DNS query sent to a DNS server outside of China. (They also use other methods, which are beyond the scope of this article.) For example, the Great Firewall ( GFW) of China uses a technique called DNS cache poison to censor the Chinese Internet. They are sent in plain text on the wire and can be exploited by middle entities. By default, DNS queries are not encrypted. It’s designed in 1987 with no security or privacy in mind. What is DNS over HTTPS and Why It’s ImportantĭNS (Domain Name System) is responsible for translating domain names to IP addresses. This tutorial will be showing you how to set up your own DNS over HTTPS (DoH) resolver on Debian with DNSdist, so your DNS queries can be encrypted and protected from prying eyes. ![]()
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