WebRTC IP Leak is a serious problem for your privacy, if not managed properly this will lead to problems. 

WebRTC Leak is relevant if you are connected through a VPN and other websites can see your original IP Address. As an example, if you are physically in the USA and you VPN through Germany in order to reach a German website and the German website can determine you are in the USA despite VPN. This is a serious leak. You can use our WebRTC Leak at https://ip8.com/webrtc-test to determine if you are leaking. 

This test should be taken with a VPN. If our scripts can see your original IP Address, then you would have an IP Leak through WebRTC. Our website offers solutions for Chrome, Firefox, Edge browsers to fix this problem.

We generally recommend using such addons in order to prevent such leak.

How to download webRTC Leak Shield

Open your favorite browser and type 'webrtc leak shield' and download the addon for your favorite browser. For chrome you may use https://chrome.google.com/webstore/detail/webrtc-leak-shield/bppamachkoflopbagkdoflbgfjflfnfl?hl=en and for firefox https://addons.mozilla.org/en-US/firefox/addon/webrtc-leak-shield/