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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Many tutorials we found on internet talk about DNSCrypt but no one talks about Ubuntu 15.04. As you know, Ubuntu 15.04 brings big changes named systemd (replaced upstart as init system). So, installing DNSCrypt on 12.04 will be different with 15.04. I try to write an article about it. In short, DNSCrypt will encrypt our DNS request so our connection will be secure from DNS hijacking or any of such security attack. We will install DNSCrypt via PPA from Pascal Mons because some days ago he uploaded the Vivid packages for DNSCypt. Thanks for Pascal Mons.