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Linux Mint 21.2


The easiest way to set Quad9 on your entire network is via your router settings. If you'd prefer to set Quad9 on a single system, please follow the steps below to configure Linux Mint to use Quad9.

Firefox, VPNs

  • Firefox is set to use Cloudflare DNS by default in some regions. If you're using Firefox, check that this is disabled.
  • VPNs typically do not respect the system or router-level DNS settings. If you're using a VPN, configure Quad9's IP addresses in the Custom DNS settings of your VPN client. Refer to your VPN provider's documentation for further information.


  • Click the Network or Wi-Fi icon on the system tray in the bottom-right corner.
    • Click Network Settings
      • Click the ⚙ icon on the bottom-right corner of the dialogue window.


  • Select IPv4 on the left-side menu.
    • In the DNS section:
      • Disable Automatic
        • Click the :plus: botton to add a second Server field.
          • Enter in the first Server field, and in the second.
            • Click Apply

Verify Configuration

Confirm you're using Quad9 by visiting in your preferred browser.

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