Setup: Linux Mint 20.3 (Cinnamon)

Introduction

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 20.3 (Cinnamon) to use Quad9.

Steps

From the Linux Mint desktop:

• Click on the Network icon on the bottom right corner of the screen.
• Click on Network Connections

• Click on your current, active network connection, either Wired connection if physically connected to your switch/router, or Wireless if using Wi-Fi.
• Click on the cog

• Navigate to the IPv4 Settings tab
• Change Method to Automatic (DHCP) addresses only
• DNS Servers: 9.9.9.9,149.112.112.112
• Click Save

If your network/computer support IPv6, it's also recommended to configure the Quad9 IPv6 addresses. If you're not sure if IPv6 is configured on your network, you can test that here: https://test-ipv6.com/

• Navigate to the IPv6 Settings tab
• Change Method to Automatic, addresses only
• DNS Servers: 2620:fe::fe,2620:fe::9
• Click Save

Disable and re-enable the Network adapter so Linux Mint will recognize the DNS server changes.

Confirm

Confirm you're using Quad9.