Linux
Under Linux / UNIX / BSD operating system, you need to edit the /etc/resolv.conf file and add the line:
nameserver {IP-OF-THE-DNS-1}
nameserver {IP-OF-THEISP-DNS-SERVER-2}
Login as the root, enter:
# vi /etc/resolv.conf
OR
$ sudo vi /etc/resolv.conf
Modify or enter nameserver as follows:
nameserver 208.67.222.222
nameserver 208.67.220.220
macOS
To change DNS settings from the command line, open up Terminal and run this to get a list of all the network interfaces:
networksetup listallnetworkservices
This will return a list similar to this:
An asterisk (*) denotes that a network service is disabled.
Bluetooth DUN
Ethernet
FireWire
Wi-Fi
Now you can configure DNS for the appropriate network interface. In my case, I want to update DNS for the “Wi-Fi” interface. To change to the DNS server settings to the local DNS server, do this:
sudo networksetup -setdnsservers Wi-Fi 192.168.1.254
sudo networksetup -setdnsservers Wi-Fi 8.8.8.8 8.8.4.4
You can put as many (or as few) DNS servers in the list; simply separate each with a space as shown in the second example above.
Reference
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