How to See If Your VPN Is Leaking Your IP Address (and How to Stop It) by Alan Henry.
From the post:
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To see if your VPN is affected:
Visit a site like What Is My IP Address and jot down your actual ISP-provided IP address. Log in to your VPN, choose an exit server in another country (or use whichever exit server you prefer) and verify you’re connected. Go back to What Is My IP Address and check your IP address again. You should see a new address, one that corresponds with your VPN and the country you selected. Visit Roseler’s WebRTC test page and note the IP address displayed on the page. If both tools show your VPN’s IP address, then you’re in the clear. However, if What Is My IP Address shows your VPN and the WebRTC test shows your normal IP address, then your browser is leaking your ISP-provided address to the world.
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Attempting to conceal your IP address and at the same time leaking it (one assumes unknowingly), can lead to a false sense of security.
Follow the steps Alan outlines to test your setup.
BTW, Alan’s post includes suggestions for how to fix the leak.
If you blindly trust concealment measures and software, you may as well activate links in emails from your local bank.
Word for the Day: Trust – Synonym for pwned.
Verify your concealment on a regular basis.