How to set up local DNS servers to block trackers across the entire home network?

Protecting the privacy of every individual device in a modern home or office becomes ineffective if network traffic is not filtered centrally. Installing a local DNS server with ad-blocking and tracker-blocking functionality allows you to intercept requests to telemetry, analytics, and malware domains even before they leave your router.

A popular solution for these purposes is deploying software like Pi-hole or AdGuard Home based on a Raspberry Pi mini-computer or an old home server. This server is configured as the primary DNS for all client devices via DHCP settings on your internet router. When any application requests the IP address of an advertising server, the local DNS returns a placeholder, preventing the connection.

This approach provides a number of advantages for security and performance. First, smart home devices, TVs, and smartphones stop sending tons of service data about your activity to manufacturers' remote servers. Second, web page loading speed increases due to cutting out unnecessary traffic. Third, blocking works for absolutely all applications, including those where blocker extensions cannot be installed.

For the effective operation of such a system, it is recommended to perform the following actions:

Implementing a home DNS filter provides full control over network communications. This is a basic step toward digital sovereignty, which protects all family members or colleagues from covert data collection and intrusive marketing tracking.