DNS server settings are found in /etc/resolv.conf. To edit use your favorite editor to open, personally I prefer nano. sudo nano /etc/resolv.conf Entries will look like nameserver <ip address>nameserver <ip address>nameserver <ip address> You should enter at least two known good DNS servers.
POW·ER·CRAM NOUN, \ˈPAU̇(-Ə)R\ˈKRAM\ – CONSISE, USEFUL INFORMATION ABOUT COMPUTERS, NETWORKS AND CLOUD.