Why is DNS not enabled when changing via NetworkManager in Ubuntu?

Question

Domain Name System

Why is DNS not enabled when changing via NetworkManager in Ubuntu?

I register for Wi-Fi through NetworkManager a trace. options:

1. IPv4 next DNS: 1.1.1.1, 1.0.0.1
   
2. IPv6 next. DNS: 2606:4700:4700::1111, 2606:4700:4700::1001
   

I check through https://whoer.net/ru and see that the DNS is Russian, although in fact it should be American.

Source: losst.ru

And also followed the instructions from cloudflare

Answer 1

I eventually figured out how to solve this problem:
1. I change DNS connections for iPV4 and iPV6 through NetworkManager in the WI-FI settings.
2. I reboot the PC through the terminal

reboot

3. Through the terminal I clean the cache of the system

sudo systemd-resolve --flush-caches

clear cache command

sudo systemd-resolve --statistics

command to check the result of clearing the cache (current cache size should be 0)
And only then https://whoer.net/ru shows the DNS change.

Answer 2

whoever shows the browser's DNS, to check the system use the nslookup command

Answer 3

Did you want to hide DNS queries? then here is https://artkus.com/DNS-over-TLS.html though the list of servers there must be replaced, probably already outdated.

Answer 4

It was probably enough
systemctl reload NetworkManager
Maybe it's also to clear the dns cache
systemctl restart NetworkManager