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Technitium DNS Server: Use Cases + Installation and Configuration

Introduction

Technitium DNS Server is a free, open-source and privacy-focused DNS (Domain Name System) server software for Windows, Linux, and macOS. It is designed to provide a secure, fast, and reliable DNS resolution service to its users. The server can be configured through a web-based interface, and it supports a variety of advanced features, such as automatic IP updates, IPv6 support, caching of DNS queries, and the ability to block unwanted domains. It is also designed to be highly secure, with built-in measures to prevent common types of DNS attacks and data leaks. Technitium DNS Server is aimed at providing an alternative to traditional DNS servers, which often have privacy and security concerns associated with them, and it is ideal for users who are looking for a more secure and private DNS resolution service.

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When a PC in my house requests a website, the Windows Server 2008 acts as the gatekeeper. It follows a very strict logic:

[ Your PC ] 
    │
    ▼ (Asks for a domain)
[ Windows Server 2008 (AD DNS) ]
    │
    ├──► Is it 'home.sergio-jimenez.net'? ──► Yes ──► Resolves locally (AD Objects)
    ├──► Is it 'sergio-jimenez.net'? ──────► Yes ──► Resolves locally (Points to Raspberry Pi)
    │
    └──► Is it anything else? (e.g., google.com)
            │
            ▼ (Forwarded)
      [ Technitium DNS (LXC) ] ──► (Blocks Ads / Resolves via Internet) ──► [ Internet ]
Why this is a correct setup:

    1. Active Directory stays happy: Windows Server must be the primary DNS for the internal domain (home.sergio-jimenez.net). If it isn't, my PCs won't be able to find the domain controller, group policies will fail, and logging in will take forever.

    2. Technitium does the heavy lifting: By offloading external queries to Technitium, I can use its advanced features—like network-wide ad-blocking (blocking telemetry, malicious domains), DNS-over-HTTPS (DoH) for privacy, and caching—without messing up the Active Directory layout.

Installation

The Technitium LXC itself was created using an automated script from the community scripts website:

bash -c "$(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVE/main/ct/technitiumdns.sh)"
Installation log output 
  ______          __          _ __  _                    ____  _   _______
 /_  __/__  _____/ /_  ____  (_) /_(_)_  ______ ___     / __ \/ | / / ___/
  / / / _ \/ ___/ __ \/ __ \/ / __/ / / / / __ `__ \   / / / /  |/ /\__ \
 / / /  __/ /__/ / / / / / / / /_/ / /_/ / / / / / /  / /_/ / /|  /___/ /
/_/  \___/\___/_/ /_/_/ /_/_/\__/_/\__,_/_/ /_/ /_/  /_____/_/ |_//____/

  💡  Running via external SSH (client: 10.0.40.31).
  💡  For better stability, consider using the Proxmox Shell (Console) instead.
  🧩  Using Advanced Install on node proxmox

  💡  PVE Version 9.1.5 (Kernel: 6.17.9-1-pve)
  🖥️  Operating System: debian
  🌟  Version: 13
  📦  Container Type: Unprivileged
  🆔  Container ID: 107
  🏠  Hostname: technitiumdns
  💾  Disk Size: 2 GB
  🧠  CPU Cores: 1
  🛠️  RAM Size: 512 MiB
  🌉  Bridge: vmbr0
  📡  IPv4: dhcp
  📡  IPv6: none
  🗂️  FUSE Support: no
  📦  Nesting: Enabled
  📦  Keyctl: Enabled
  🎮  GPU Passthrough: no
  💡  Timezone: Europe/Madrid
  🔍  Verbose Mode: yes
  🚀  Creating an LXC of Technitium DNS using the above advanced settings
  ✔️  Saved app defaults: /usr/local/community-scripts/defaults/technitiumdns.vars
  ✔️  Storage local (Free: 20.2GB  Used: 16.6GB) [Template]
  ✔️  Storage local (Free: 20.2GB  Used: 16.6GB) [Container]
  ✔️  Storage 'local' (dir) validated
  ✔️  Template storage 'local' validated
  ✔️  Template search completed
  ✔️  Template debian-13-standard_13.1-2_amd64.tar.zst [local]
  💡  An update for the Proxmox LXC stack is available
  pve-container: installed=6.1.0  candidate=6.1.10
  lxc-pve     : installed=7.0.0-2  candidate=7.0.0-2
  note        : option 1 runs host apt update + apt upgrade

  [1] Run host upgrade now (recommended). WARNING: this runs apt upgrade and updates all Packages on your host!
  [2] Ignore
  [3] Cancel

Select option [1/2/3]: 1
  ✔️  LXC stack upgraded.
  ✔️  LXC Container 107 was successfully created.
  ✔️  Started LXC Container
  ✔️  Network in LXC is reachable (ping)
  ✔️  Customized LXC Container
  ✔️  Set up Container OS
  ✔️Network Connected:10.0.30.243
  ✔️  IPv4 Internet Connected
  ✖️  IPv6 Internet Not Connected
  ✔️  Git DNS: github.com:(✔️ ) raw.githubusercontent.com:(✔️ ) api.github.com:(✔️ ) git.community-scripts.org:(✔️ )
Hit:1 http://security.debian.org trixie-security InRelease
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Reading package lists... Done
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Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
  base-files bash bind9-dnsutils bind9-host bind9-libs dhcpcd-base distro-info-data dpkg e2fsprogs inetutils-telnet krb5-locales libc-bin
  libc-l10n libc6 libcap2 libcap2-bin libcom-err2 libext2fs2t64 libgnutls30t64 libgssapi-krb5-2 libk5crypto3 libkrb5-3 libkrb5support0
  libnghttp2-14 libnss-systemd libpam-systemd libpam-wtmpdb libpython3.13-minimal libpython3.13-stdlib libsqlite3-0 libss2 libssl3t64
  libsystemd-shared libsystemd0 libudev1 libwtmpdb0 libxml2 linux-sysctl-defaults locales logsave nano openssh-client openssh-server
  openssh-sftp-server openssl openssl-provider-legacy postfix python3-requests python3-urllib3 python3.13 python3.13-minimal sed sqv ssh systemd
  systemd-sysv systemd-timesyncd tzdata udev wtmpdb
60 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
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Unpacking python3.13 (3.13.5-2+deb13u2) over (3.13.5-2) ...
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Setting up sqv (1.3.0-3+b2) ...
(Reading database ... 20273 files and directories currently installed.)
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Setting up distro-info-data (0.66+deb13u2) ...
Setting up libnghttp2-14:amd64 (1.64.0-1.1+deb13u1) ...
Setting up systemd (257.13-1~deb13u1) ...
/usr/lib/tmpfiles.d/legacy.conf:14: Duplicate line for path "/run/lock", ignoring.
Setting up krb5-locales (1.21.3-5+deb13u1) ...
Setting up libcom-err2:amd64 (1.47.2-3+b11) ...
Setting up locales (2.41-12+deb13u3) ...
Generating locales (this might take a while)...
  en_US.UTF-8... done
Generation complete.
Setting up libkrb5support0:amd64 (1.21.3-5+deb13u1) ...
Setting up tzdata (2026b-0+deb13u1) ...

Current default time zone: 'Europe/Madrid'
Local time is now:      Sat Jun  6 19:08:41 CEST 2026.
Universal Time is now:  Sat Jun  6 17:08:41 UTC 2026.
Run 'dpkg-reconfigure tzdata' if you wish to change it.

Setting up libcap2-bin (1:2.75-10+deb13u1+b1) ...
Setting up libpython3.13-minimal:amd64 (3.13.5-2+deb13u2) ...
Setting up linux-sysctl-defaults (4.12.1) ...
Setting up systemd-timesyncd (257.13-1~deb13u1) ...
systemd-time-wait-sync.service is a disabled or a static unit not running, not starting it.
Setting up udev (257.13-1~deb13u1) ...
systemd-udevd.service is a disabled or a static unit not running, not starting it.
Setting up libss2:amd64 (1.47.2-3+b11) ...
Setting up dhcpcd-base (1:10.1.0-11+deb13u2) ...
Installing new version of config file /etc/dhcpcd.conf ...
Setting up libk5crypto3:amd64 (1.21.3-5+deb13u1) ...
Setting up logsave (1.47.2-3+b11) ...
Setting up python3-urllib3 (2.3.0-3+deb13u1) ...
Setting up postfix (3.10.5-1~deb13u1) ...

Postfix (main.cf) configuration was not modified by debconf.  If you need to
make changes, edit /etc/postfix/main.cf (and others) as needed.  To view
Postfix configuration values, see postconf(1).

After modifying main.cf, be sure to run 'systemctl reload postfix'.

Setting up nano (8.4-1+deb13u1) ...
Setting up python3.13-minimal (3.13.5-2+deb13u2) ...
Setting up ssh (1:10.0p1-7+deb13u4) ...
Processing triggers for man-db (2.13.1-1) ...
Processing triggers for dbus (1.16.2-2) ...
Processing triggers for shared-mime-info (2.4-5+b2) ...
Processing triggers for procps (2:4.0.4-9) ...
Processing triggers for debianutils (5.23.2) ...
Processing triggers for mailcap (3.74) ...
Processing triggers for libc-bin (2.41-12+deb13u3) ...
Processing triggers for postfix (3.10.5-1~deb13u1) ...
Restarting postfix
  ✔️  Updated Container OS
Hit:1 http://security.debian.org trixie-security InRelease
Hit:2 http://deb.debian.org/debian trixie InRelease
Hit:3 http://deb.debian.org/debian trixie-updates InRelease
Get:4 https://packages.microsoft.com/debian/13/prod trixie InRelease [3,952 B]
Get:5 https://packages.microsoft.com/debian/13/prod trixie/main all Packages [342 B]
Get:6 https://packages.microsoft.com/debian/13/prod trixie/main amd64 Packages [23.9 kB]
Fetched 28.2 kB in 0s (195 kB/s)
All packages are up to date.
Installing:
  aspnetcore-runtime-10.0

Installing dependencies:
  dotnet-host  dotnet-hostfxr-10.0  dotnet-runtime-10.0  dotnet-runtime-deps-10.0

Summary:
  Upgrading: 0, Installing: 5, Removing: 0, Not Upgrading: 0
  Download size: 49.4 MB
  Space needed: 110 MB / 1,044 MB available

Get:1 https://packages.microsoft.com/debian/13/prod trixie/main amd64 dotnet-host amd64 10.0.8 [44.6 kB]
Get:2 https://packages.microsoft.com/debian/13/prod trixie/main amd64 dotnet-hostfxr-10.0 amd64 10.0.8 [151 kB]
Get:3 https://packages.microsoft.com/debian/13/prod trixie/main amd64 dotnet-runtime-deps-10.0 amd64 10.0.8 [3,178 B]
Get:4 https://packages.microsoft.com/debian/13/prod trixie/main amd64 dotnet-runtime-10.0 amd64 10.0.8 [36.4 MB]
Get:5 https://packages.microsoft.com/debian/13/prod trixie/main amd64 aspnetcore-runtime-10.0 amd64 10.0.8 [12.8 MB]
Fetched 49.4 MB in 1s (53.0 MB/s)
Selecting previously unselected package dotnet-host.
(Reading database ... 20273 files and directories currently installed.)
Preparing to unpack .../dotnet-host_10.0.8_amd64.deb ...
Unpacking dotnet-host (10.0.8) ...
Selecting previously unselected package dotnet-hostfxr-10.0.
Preparing to unpack .../dotnet-hostfxr-10.0_10.0.8_amd64.deb ...
Unpacking dotnet-hostfxr-10.0 (10.0.8) ...
Selecting previously unselected package dotnet-runtime-deps-10.0.
Preparing to unpack .../dotnet-runtime-deps-10.0_10.0.8_amd64.deb ...
Unpacking dotnet-runtime-deps-10.0 (10.0.8) ...
Selecting previously unselected package dotnet-runtime-10.0.
Preparing to unpack .../dotnet-runtime-10.0_10.0.8_amd64.deb ...
Unpacking dotnet-runtime-10.0 (10.0.8) ...
Selecting previously unselected package aspnetcore-runtime-10.0.
Preparing to unpack .../aspnetcore-runtime-10.0_10.0.8_amd64.deb ...
Unpacking aspnetcore-runtime-10.0 (10.0.8) ...
Setting up dotnet-host (10.0.8) ...
Setting up dotnet-hostfxr-10.0 (10.0.8) ...
Setting up dotnet-runtime-deps-10.0 (10.0.8) ...
Setting up dotnet-runtime-10.0 (10.0.8) ...
Setting up aspnetcore-runtime-10.0 (10.0.8) ...
  ✔️  Installed Dependencies
  ✔️  Successfully deployed archive to /opt/technitium/dns
  ✔️  Service created
Summary:
  Upgrading: 0, Installing: 0, Removing: 0, Not Upgrading: 0
  ✔️  Cleaned
  ✔️  Completed successfully!

  🚀  Technitium DNS setup has been successfully initialized!
  💡  Access it using the following URL:
  🌐  http://10.0.30.243:5380

Configuration

First step is to change admin password.

image.png

Little to configure here apart from the most important thing which is the block list. I will use HAZEGI Multi Ultimate:

image.png

image.png

To use it, I'll go to Settings > Blocking > Allow / Block List URLs. Then from the Quick Add dropdown, I'll select the list and it'll get copied to the textbox above. Then just save settings.

image.png

I need to make sure my DHCP pools deliver the DNS server option with the IP of the Windows Server set, NOT the Technitium IP. 

To configure Technitium as a forwarder on the Win2k8 see this.


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