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DNS or the domain name system is used to translate domain names such as www.astrill.com into a numerical IP addresses, e.g. 184.108.40.206 which are required to route packets of data on the Internet. Whenever your computer needs to contact a server on the Internet, such as when you enter a URL into your browser, your computer contacts a DNS server and requests the IP address. Most Internet service providers assign their customers a DNS server which they control and use for logging and recording your Internet activities.
Under certain conditions, even when connected to the anonymous network, the operating system will continue to use its default DNS servers instead of the anonymous DNS servers assigned to your computer by the anonymous network. This is called a leak. DNS leaks are a major privacy threat since the anonymous network may be providing a false sense of security while private data is leaking.
All major browsers with WebRTC implementation allow requests to STUN servers which will return the provider an assigned IP address for the user even if it is connected via VPN.
Astrill provides an easy way to fix a DNS leak on Windows, which is very well known to have DNS leaks. Astrill also perfectly masks your real IP. It is advised to turn off Java and Flash and enable them only on demand.