In particular the dns1 and 2 are those of my isp, are they ok?
Since we are talking about Cleanbrowsing, I would do it this way:
DNS Server 1 : 185.228.168.9
DNS Server 2 : 185.228.169.9
(those two are used only when DNS-over-TLS is not working)
DNS-over-TLS Profile: Opportunistic
(this will allow DNS resolutions for unauthenticated servers)
In this case, you will be using Cleanbrowsing DNS servers with Security Filter no matter if DNS-over-TLS is working or not.
Is it possible to view sites that have been blocked by Cleanbrowsing DNS?
I want to go back a bit, because there is a better way to filter clients. Asuswrt-Merlin has a DNSFilter option in LAN section.
Go to LAN -> DNSFilter and assign different DNS servers for different clients on your network by MAC address. For example:
- your PC -> Cloudflare DNS, no filtering, faster servers (or Cleanbrowsing DNS with Security Filter only)
- your kids laptop -> Cleanbrowsing DNS, Adult Filter (includes Security Filter), slower DNS servers but secure Internet
- your smart TV -> Cleanbrowsing DNS, Family Filter (includes Security Filter + Mixed Content + VPN/Proxy Filters)
Get the idea?
You can define on a router level what device will have filtering and what type of filtering.
If you want ad-blocking DNS on a specific device, use AdGuard DNS, it works similarly to Diversion script.
https://adguard.com/en/adguard-dns/overview.html
It also blocks malicious websites and adult content.
So, playing with different DNS services you can achieve similar results to running popular scripts on the router. There are differences of how scripts and DNS servers protect your Internet connection, but the end result is very similar and easy to setup for people who don't really want to mess with Custom Scripts options in Asuswrt-Merlin.