How to set permanent DNS nameservers on Ubuntu 21.04
DNS stands for Domain Name System server, which is responsible for translating a domain name into an IP address. Using custom DNS servers on Linux can improve performance and security.
For more explanation on this video: https://www.linuxhelp.com/how-to-set-permanent-dns-nameservers-on-ubuntu-21-04
by LinuxHelp
linux dns server
It didn't work on dhcp connections (wifi for example)