How to Configure DNS Server on Ubuntu & LinuxMint
DNS servers use port 53 by default. Incoming and outgoing packets should be allowed onport 53. Also allow connections on port 921 if you configure a lightweight resolver server.The DNS control utility, rndc, connects to the DNS server with TCP port 953 by default. How to Set DNS Nameservers on Ubuntu 18.04 - Linux Aug 21, 2019 How to configure nameserver in Linux - Kernel Talks Sep 26, 2017
DNS 101: An introduction to Domain Name Servers | Enable
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. Linux for freshers: DNS Server Interview Questions And
systemd-resolved: How to set DNS servers - Arch Linux
linux - Resolv Conf Multiple DNS Servers with specific Impossible to achieve using /etc/resolv.conf only.. I'd say the easiest thing is to install dnsmasq (a caching DNS client), make it the sole resolver by putting nameserver 127.0.0.1 into /etc/resolv.conf and then modify dnsmasq configuration:. uncomment no-dhcp-interface= to disable dnsmasq's DHCP server facilities;; add a single generic record: server=10.8.0.1;