Check that your VPN is waterproof

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Last updated: January 1, 2023

It's not just the WebRTC protocol who can possibly pose problems with your VPN. Have you ever heard of DNS leaks ? It is in fact theaccidental sending of information packet using your ISP's DNS instead of the one you normally use with your VPN service.

Le DNS (domain name system) is a protocol used to translate a domain such as as an IP address directly usable for the routing of data packets on the Internet.

When you enter a URL in your browser, for example, your computer contacts a DNS server to translate the URL into an IP address. So far all is well.

The problem is that most ISPs assign their customers DNS servers, which means that it is possible for your ISP to identify you and link to the sites you visit.

This is because under certain circumstances your operating system may continue to use the default DNS servers instead of the DNS servers assigned by the VPN.

Clearly, it is sometimes possible, even with a VPN, to not be 100% protected.

So, how can you be sure that you are not subject to this DNS leak?

Well, you can run a test on the site DNS Leak, a service that detects small leaks. If the servers that will be displayed are not those of your VPN then you are potentially vulnerable.


The solution is therefore to delete the DNS servers manually or toinstall the DNSFix application. Note that some serious Premium VPN providers offer a feature in their VPN software: DNS Leak Protection.