Setting up a DNS adblocker on a FreeBSD jail

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Setting up a local DNS adblocker to get rid of ads, trackers, telemetry, and malware on a FreeBSD jail

We all heard about adblocking at DNS level, implemented by services like Pi-hole, or maybe just setting an external custom DNS server like Cloudflare's (fast & more private, not necessarily blocking requests), or Quad9.

These are all great options, but in my opinion they all lack a little bit of something, or provide too much. For example, external, custom DNS servers are good for a quick & easy setup, but you lack the ability of customizing the sources or manually whitelisting or blacklisting domains, and so on. On the other hand, a service like Pi-hole is great, it allows you to set up custom sources, you can whitelist and blacklist custom domains, you can set your own provider for the upstream DNS server, but it kinda requires a Debian-based distro in order to offer an easy setup via their own installer, in order to get the web ui.