A DNS leak is a flaw with the network configuration that outcomes in the loss of security by sending DNS queries over unsecured connections as opposed of using the VPN association.
The weakness permits an ISP, and eavesdroppers, to perceive what sites a user might visit. This is predictable since the browser's DNS requests are sent to the ISP DNS server straightforwardly, and not through the VPN.
Here are the best practices that you could implement to prevent DND leak on your devices.
Mostly the DNS is set up to the ISP server which could be easily switched to any third party server such as free centralized servers, Google DNS or OpenDNS including the paid one. With these third-party servers you could get numerous benefits other than the protection from ISP snooping and hiding internet browsing activities;
If your default DNS server is one that was appointed by your ISP, one of the simplest approaches to shield them from seeing what you're doing on the internet is to change your DNS server. Regardless of whether you aren't stressed over DNS leak, changing your default DNS server may be a smart thought, as it may bring about quicker Internet speeds.
For selecting a custom DNS server other than ISP’s DNS server, you could choose from the many common ones such as openDNS and Google DNS. You may also select lesser known but general ones such as Norton DNS, Comodo Secure DNS and others.
Here are the IPs for DNS servers so that you could easily enter these sets while changing settings of your browser, devices or operating systems.
|Service||OpenDNS||Google Public DNS||Norton ConnectSafe||Comodo Secure DNS|
Chrome – An extension, free of cost is available for installation. It will fix the issues you are facing.
Firefox – A bit of work needs to be done here but it is worth the security you need. On the address bar in Firefox, type: “about: config”. A page will appear where you will have to enter “media.peerconnection.enabled” onto the search bar. When it will appear, set the entry to ‘false’. It’s done.
Opera – DNS leak can be assured in Opera by blocking WebRTC. Follow the steps listed:-
By following all the steps listed for each of the popular operating systems used on earth, you can assure that your DNS does not get leaked. One thing is common in all of them; that is to change your DNS settings.
The change of DNS server in the router would affect the DNS request to all the devices which are connected to it. It is an easy way to change the entire network settings instead of every device’s setting individually. However, it is necessary that your devices are set up for DHCP which means they access router for DNS server information.Your DNS server is usually set up to the ISP’s DNS server and to change this, you need to access your router’s web interface. Every router has their specific way to access it and you could find instructions in your router’s manual. You can always access your router’s company support site to download the manual.Once you are at the router’s web interface, you will probably find the setup or basic settings page into which there are DNS text fields usually in the DNS Address section. Now set up your DNS servers; primary DNS server and secondary DNS server.
You can change the default DNS server settings into your android phone or tablet but this will apply to a single network only. For instance, if you have changed the settings while connected to your home Wi-Fi than you need to change it again when connected to another network.To change the settings you need to follow certain steps;
Unfortunately, when you change the IP settings to static, you can’t use DHCP on the network. Yet, you can use the Set DNS app if your phone is rooted. With this app, you can choose a custom DNS for yourself and the app will automatically set this DNS server every time you connect to a new network. Therefore, you don’t need to change manual settings or static IPs.
To change the DNS server settings in iOS you need to connect Wi-Fi to your device.
For iOS manual settings, you will need to change the DNS server setting each time you connect to a new network.
We have previously mentioned that despite a VPN connection, DNS request could be transmitted to your internet provider through the ISP DNS server. This is because of a change in default DNS setting due to any reason or when anyone out of numerous DNS requests leaks to the ISP which is caused when the VPN is overlooking the DNS requests.
Also, the reverse in DNS settings to default ISP DNS is sometimes due to the VPN disconnect which occurs most often.
Witnessing the increase in DNS issues, some popular VPN providers have introduced a feature of DNS leak protection which makes sure that all the DNS requests are going through the encrypted and anonymous VPN servers. Therefore, you must check the VPN features before selecting it for yourself.
With some VPN monitoring software, the users could get support for fixing DNS leaks. However, you might have to pay for a premium version of the most VPN monitoring software for getting the feature of DNS leak fixing. Therefore, it might not be a consideration for most individuals unless they are keen to know that their VPN connection is totally secure or not.
You could configure your own firewall in order to restrict the DNS requests only to the VPN servers. All you need to do is to check the network interface settings when you are connected to VPN. In Windows, open command and run ifconfig/all command which will open up the display to view the IP address of your VPN DNS server. Whereas, in Linux, the network interface settings could be viewed through ifconfig command.
Finally, set the firewall rule which hinders all the DNS traffic if it’s not routed towards that specific IP address. Such a command will assure that your domain name requests are only resolved if they are going through VPN DNS.
Teredo is a feature of Windows that enables communication across the two IP protocols, the IPv4 and the IPv6. These protocols are present on the internet and with the help of Teredo, the IPv6 capable hosts that are on IPv4 internet could get the complete IPv6 connectivity when they have no native connection to IPv6 network. Yet, the entire Teredo tunneling process is a bit complicated and you can get detailed information here.
Sometimes, Teredo could be the cause of DNS leaks and therefore, you could prevent DNS leaks by disabling Teredo from the settings. To disable Teredo, open command line, and type "netsh interface teredo set state disabled".
However, if you need to enable Teredo at some point then enter “netsh interface teredo set state type=default” in the command line.