This tutorial will help you setup DoT (short for DNS over TLS) security into your Debian 12 Bookworm. With this, we hope you will have a very secure internet access so nobody can forcefully block or redirect your browsing activities in the middle especially for your dns line. This article complements our both Debian 12 Install Guide and After Install Recommendation. We choose here a secure public dns service that serves DoT --Quad9 from Swiss-- to replace our internet service provider's one which does not support it. We hope this will be helpful for you.

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Today we increasingly saw the importance of privacy and security in computing. This includes our browsing activity, which now needs protection even more than before. This tutorial will help you enable  DNS over TLS (DoT) on Ubuntu using Quad9 service, an alternative technology to DNSCrypt or DoH, that helps preventing anybody to wiretap and/or hijack what website you are visiting on web browser. This feature is already built-in on Ubuntu 22.04 LTS Jammy Jellyfish and we do not need to install additional software.  

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