Regardless of the distribution of Linux that you are using (such as Ubuntu, CentOS, Debian, Arch, Redhat, etc), the process of determining what DNS servers are currently being used for domain name resolution is the same. To determine what DNS servers are being used, you simply need to view the contents of the "/etc/resolv.conf" file.
Add name servers to the configuration file. On most Linux operating systems, the DNS servers that the system uses for name resolution are defined in the /etc/resolv.conf file. That file should contain at least one nameserver line. Each nameserver line defines a DNS server. The name servers are prioritized in the order the system finds them in Regardless of the distribution of Linux that you are using (such as Ubuntu, CentOS, Debian, Arch, Redhat, etc), the process of determining what DNS servers are currently being used for domain name resolution is the same. To determine what DNS servers are being used, you simply need to view the contents of the "/etc/resolv.conf" file. DNS (Domain Name System) is a system which translates the domain names you enter in a browser to the IP addresses required to access those sites, and the best DNS servers provide you with the best How To Change DNS Servers Using Command Prompt. A DNS server holds public IP addresses and related hostnames in a database, and is used to resolve or translate the hostnames to IP addresses. The server does this by running special software to communicate with other servers through special protocols based on certain requests from the computer.
After making changes, you will need to turn off and reconnect the network to apply new settings. On Ubuntu 16.04 and older versions of Ubuntu, there was a file, /etc/resolv.conf, that was used to configure DNS name servers. Although /etc/resolv.conf still exist on Ubuntu 18.04, it is no longer where you configure your DNS name servers.
Ubuntu 20.04 Server: How to change DNS and domain name. In the new Ubuntu version, you cannot change /etc/resolv.conf. You can change it. But it won't last a restart. It will be replaced by systemd-resolved. I wanted to change the domain name and DNS/nameserver. Setting DNS Nameservers on Ubuntu Desktop # Setting up DNS nameservers on Ubuntu 18.04 Desktop computers is super easy and requires no technical knowledge. Launch the Settings window. If you are connected to a WiFi network click on the "Wi-FI" tab. Otherwise, if you have a wired connection click on the "Network" tab.
Yes, Ubuntu has had an internal listening scheme on port 53 but it is supposed to use the DNS servers issued by DHCP. With the changes it looks like it now creates a new internal loopback IP of 127.0.0.53 as well for another loopback path.
DNS (Domain Name System) is a fundamental facilitator of several networking technologies such as mail servers, Internet browsing, and streaming services e.g. Netflix and Spotify, among others.. It works on a special computer called a DNS server - which keeps a database record of several public IP addresses along with their corresponding hostnames in order for it to resolve or translate