When visiting the dashboard on OVPN, you will see if you have a DNS leak or not. You can also use our DNS leak test to check if you have any leaks.
You can also manually enter one the following DNS addresses:
Do note that all of our VPN servers have their own DNS addresses that differs from the above public DNS addresses so it's always best to use our DNS leak test to see if you have any leaks.
To fix a DNS leak, read our guide on how to permanently change DNS servers to ours.