DNS leak protection: how to stop DNS leaks easily

Julie Cole
Julie Cole | Contributing Writer
Last updated: April 21, 2022
dns leak protection
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For the past few years, there has been an enormous increase in the number of cyber-attacks. Hence, regulating and testing data processing systems to verify security measures is worthwhile. Of course, using a VPN is the easiest way to stay anonymous online. However, if you experience a DNS leak, it entirely voids the purpose of a VPN. Read through to understand what it is and learn about DNS leak protection.

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What is a DNS?

The Domain Name Service (DNS) generally refers to the mapping of a domain name to an IP address. Hence, one can remember a domain name and not necessarily the IP address. DNS services are requested automatically. When you connect to the internet via a home router, the Internet Service Provider (ISP) gains access to the IP address and the DNS server. One can opt to use DNS servers available to the public instead of using those provided by the ISP by configuring the internet connections manually.

What is DNS leak?

stop dns leak

A DNS leak is a significant threat to your online privacy and security. Imagine browsing through the web thinking that you’re anonymous while actually, you’re not? Frustrating, right? A DNS leak provides a false sense of security to the user. Despite using a VPN, you can unknowingly access default DNS servers instead of the anonymous DNS servers assigned by the VPN. Hence, a DNS leak exposes a user’s real IP address to the public network despite the connection to a VPN service.

Unfortunately, services from various VPN networks are prone to DNS leakage due to several reasons. Recently, some VPN network providers have integrated anti-DNS leak features into their VPN software. However, accessing a malicious website might switch the browser to unsecured DNS to leak the IP address.

How to detect and fix DNS leak?

Performing a DNS leak check is quite straightforward: You can visit a site such as cryptoip.onfo and run the DNS leak test. What’s more, many VPN services comprise solutions that monitor the DNS requests to make sure that they are routed through the VPN and not ISP network.

To fix DNS leak issues and protect the privacy of the user, the VPN technology is mostly used to create a virtual and safe connection over a network. Hence, all DNS requests and data are passed through a VPN with DNS leak protection.

DNS leak protection when using a VPN?

As mentioned earlier, VPN facilitates sending requests through anonymous DNS server through the VPN and not through the browser. Hence, a VPN makes sure that the ISP does not monitor the connection. However, the browsers at times ignore the use of a VPN and will send the DNS request right through to the ISP. Perhaps you’ve carried out the leak test and have concluded that your desktop has a DNS leakage. That’s all right. How about changing the DNS servers? It’s quite simple. Initially, the default DNS server is usually ISP assigned. Even if DNS leak is not a big deal to you, changing DNS server results in faster internet speeds while there’s no slightest DNS leakage.

Some VPNs come with an integrated system that allows monitoring of the DNS requests to ensure that there are nowhere near the ISP. Although such features are available in the premium versions of the software, it’s worth investing.

Disable Teredo

disable teredo

Ever heard of Teredo? Teredo is the Windows-based technology that allows communication of two IP protocols. Severally, the software is responsible for DNS leak. Hence, you might want to disable Teredo. To deactivate it, open up the command space and enter the following command: “netsh interface Teredo set state type=default” without the quotation marks.

Other ways to stop DNS leaks

Considering a severe privacy threat as a result of DNS leakage, several preventive measures have been developed. Interestingly, there are many VPNs with DNS leak protection integration. Below are other tips on how to stop DNS leak issues.

  • Enforce a good DNS service: You can check out for TCP/IPv4 options within the properties of your network adapters. Here, set OpenDNS or whichever DNS service you prefer for all available network adapters. Enforcing another DNS ensure that your internet provider’s DNS servers are not used.
  • Blocking the non-VPN traffic: Here, you can use IP binding or configure your firewall that blocks all non-VPN traffic.
  • DNS leak fix on Windows 10: Windows 10 systems are also vulnerable to DNS leaks each time you connect to the internet. The DHCP settings in Windows 10 systems are automatically configured to the ISP. If you’re using a Windows 10 system, try using the static DNS server or Public DNS services. You can also seek recommendations from the Open mic project.

Change DNS settings

  1. Open the control panel and go to Network and Sharing Center.
  2. Go to the Adapter settings on the left and locate your network.
  3. At the right of the network icon, click on properties on the drop-down menu.
  4. Take on the Internet Protocol Version 4 (IPv4) in the Windows and then click on it and go to the features.
  5. Take on the radio button and use the following DNS server address and change them to your preferred addresses. Upon saving the changes, you’ll be good to go!
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  1. Dolcie_Ward

    No doubt about it, using a VPN is the best way to stay private and protected on the internet. But we need to consistently check if our VPN is protecting optimally. Your guide and tutorial on DNS leak protection are helpful. I will definitely recommend this page to friends using VPN. We all need to stay protected all of the time

  2. Kristian Kelley

    Recently cybercrime is a growing concern. This brings DNS to mind as a way of building improved cybersecurity. My online privacy and security is as important as ever.

  3. Sammie Yung

    I just disabled Toredo on my windows and it came up with “Ok” after the command.. Does this means the problem is solved already?. Thanks anyway for the write up

  4. BobG

    Thank you so much for that article. I didn’t even know what DNS leaks were, now that I know I’ll definitely do what it takes. Your article is quite complete and clear, I’ll be sure to check all your other guides.

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