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<h1>DNS over TLS (DoT) with Mullvad</h1>
<p>This guide assumes that you're running a <strong>systemd-based</strong> operating system.</p>
<h2>1. Configure systemd-resolved</h2>
<p>Add the following block to your <code>/etc/systemd/resolved.conf</code>:</p>
<pre><code>[Resolve]
DNS=194.242.2.4#base.dns.mullvad.net
FallbackDNS=194.242.2.2#dns.mullvad.net
DNSOverTLS=yes
DNSSEC=yes
Domains=~.</code></pre>
<p>Once the changes are saved, restart systemd-resolved:</p>
<pre><code>sudo systemctl restart systemd-resolved</code></pre>
<h2>2. Symlink resolv.conf</h2>
<p>To make sure your system uses systemd-resolved over the traditional resolv.conf, create a symlink:</p>
<pre><code>sudo ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf</code></pre>
<h2>3. Verify DNS resolution</h2>
<p>Check if you are able to resolve domain names correctly:</p>
<pre><code>resolvectl query google.com</code></pre>
<p>If you see output, you're golden!</p>
<h2>4. Edge Cases: Tailscale</h2>
<p>If you're using a service such as <strong>Tailscale</strong> which overrides your <code>resolv.conf</code> with MagicDNS, it may break your DoT setup. To fix this:</p>
<ol>
<li>Re-create the symlink: <code>sudo ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf</code></li>
<li>Restart the services:</li>
</ol>
<pre><code>sudo systemctl restart tailscaled
sudo systemctl restart systemd-resolved
sudo tailscale up --accept-dns=true</code></pre>
<p>If your <code>resolve.conf</code> looks like this, you're all good:</p>
<pre><code>nameserver 127.0.0.53
options edns0 trust-ad
search tailxxxxx.ts.net</code></pre>
<h2>5. Configure Browsers</h2>
<p>If you were previously using DoH (DNS Over HTTPS) and want to shift to system-wide DoT:</p>
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<span class="browser-title">Firefox-based browsers:</span>
<p>Settings -> Privacy and Security -> DNS over HTTPS -> <strong>Off</strong></p>
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<div class="browser-box">
<span class="browser-title">Chromium-based browsers:</span>
<p>Settings -> Privacy and Security -> Use Secure DNS -> <strong>Off</strong></p>
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<p>And just like that, you've configured DoT for your system!</p>
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