DNS Leaks: How to Test and Prevent VPN DNS Leaks
What is a DNS leak? Learn how to test for VPN DNS leaks, what causes them, and how to prevent your browsing data from being exposed.
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What Is a DNS Leak?
A DNS (Domain Name System) leak occurs when your DNS queries bypass the VPN tunnel and go directly to your ISP's DNS servers instead. This means your ISP can see every website you visit, even though you are connected to a VPN. DNS leaks completely defeat the purpose of using a VPN for privacy.
How to Test for DNS Leaks
To check for DNS leaks: 1. Connect to your VPN. 2. Visit a DNS leak test website (many VPNs provide their own). 3. Check if the DNS servers shown belong to your ISP or your VPN provider. If you see your ISP's DNS servers, you have a leak.
Common Causes of DNS Leaks
- Improperly configured VPN software
- Windows OS DNS settings overriding VPN DNS
- IPv6 traffic not being routed through the VPN tunnel
- Teredo and SMHNR IPv6 transition technologies on Windows
- Manual DNS server configuration in network settings
How to Prevent DNS Leaks
- Use a VPN with built-in DNS leak protection.
- Disable IPv6 if your VPN does not support it.
- Enable the VPN's kill switch feature.
- Use the VPN's DNS servers exclusively.
- Regularly test for leaks using online tools.
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