Change DNS to Automatic DNS using script

Question

My computer has PureVPN which changes the DNS address every time I use this. This renders me unable to connect to the internet on my home and organizational networks, as they both use their own DNS servers. Is there a batch script that just automatically changes the IPv4 DNS settings to 'get automatically'? Because then I can just put it on my desktop and run it whenever it doesn't work. Thanks!

Solution

DNS configuration can be changed to dynamic with netsh command line tool. Run this command as administrator:

netsh interface ip set dnsservers name="Ethernet" source=dhcp

the source=dhcp option changes DNS source to be set dynamically. Here details from netsh interface ip set dnsservers help command:

source - One of the following values:
       dhcp: Sets DHCP as the source for configuring DNS servers for the specific interface.
       static: Sets the source for configuring DNS servers to local static configuration.

Also you can revert DNS server from dynamic to static i.e. change DNS to a specific IP address (e.g. 10.0.0.1) using this command:

netsh interface ip set dnsservers "Ethernet" static 10.0.0.1 primary

Change the name=Ehternet option with the name of your default network interface name.

Further reading:

• Netsh Command Syntax, Contexts, and Formatting
• Microsoft DOS netsh command
• ss64 netsh