1.What is DNS?

When using a VPN, DNS (Domain Name System) requests can sometimes leak, revealing your browsing activity even if your traffic is encrypted. Here’s what you need to know about VPN and DNS: DNS translates domain names (e.g., google.com) into IP addresses. Normally, your ISP handles DNS queries, which can reveal your browsing history.

VPN and DNS Leaks

• If your VPN doesn’t handle DNS requests properly, your queries might bypass the VPN and go to your ISP’s DNS servers (DNS leak).
• This exposes your browsing activity, even if your IP is hidden.

How to Prevent DNS Leaks

• Use VPN with Built-in DNS Protection: Good VPNs (like NordVPN, ProtonVPN, Mullvad) route DNS queries through their own servers.
• Enable DNS Leak Protection:
  • In VPN settings, enable "DNS leak protection" or "Always use VPN DNS servers".
  • On Windows, disable IPv6 (as it can bypass VPN DNS).
• Manually Configure DNS:
  • Set DNS to VPN provider’s servers (e.g., 1.1.1 for Cloudflare, 9.9.9 for Quad9).
• Use DoH (DNS over HTTPS) or DoT (DNS over TLS):
  • Encrypts DNS requests even outside a VPN (e.g., in Firefox or via dnscrypt-proxy).
• Check for Leaks:
  • Test at DNSLeakTest.com or ipleak.net.

Common Issues

• Windows 10/11 VPN Leaks: The OS sometimes ignores VPN DNS settings. Fix:
  • Disable "Smart Multi-Homed Name Resolution" (in PowerShell: Set-NetConnectionProfile -InterfaceAlias "Your VPN" -DHCPNameServer "VPN_DNS_IP").
• Android/iOS: Most VPN apps handle DNS properly, but check for leaks.
• Split Tunneling: Excluding apps from the VPN may allow DNS leaks.

Advanced Solutions

• Run Your Own DNS Resolver (e.g., Pi-hole + Unbound).
• Use a Firewall to block non-VPN DNS traffic (e.g., SimpleWall on Windows).

Conclusion

To ensure privacy: ✔ Use a VPN with private DNS servers.
✔ Enable DNS leak protection.
✔ Regularly test for leaks.
✔ Consider DoH/DoT for extra security.

If your VPN doesn’t protect DNS, your ISP (or any snooper) can still see what sites you visit—even if your IP is hidden. Always verify!

Need a specific VPN recommendation or troubleshooting help? Let me know!