![]() This is because your tunneled traffic has to be encoded into many small DNS requests, which is then sent through many layers of DNS caches and proxies (depending on the ISP) before arriving at your own name-server. When it does work, it will be VERY VERY slow. ![]() What's that catch? Well there's two big blockers preventing free internet for everyone:ĭNS tunnels have been around for a long time and many organizations are well aware of them and will filter out suspicious DNS traffic. ![]() In order to do this you must own a domain name (or a subdomain) and the tunnel software will make garbage-looking name requests to that domain where the DNS tunnel masquerading as a DNS server will respond to and form a covert communication channel. After that resolution, your device will try to connect to that IP where it may get blocked and that's how you can try to visit " " and instead get redirected to some pay-wall for the WiFi provider.Ī DNS tunnel allows you to exploit this loophole by proxying the internet traffic into these DNS requests. In order for your device to resolve something like " " into an IP address, it needs to communicate with a "DNS server" which coverts domain names to IP addresses. Ever connect to an open WiFi to find that you need to login or pay to use it? Or a network that blocks Reddit and other social media sites? How do they know what to block? The filtering usually happens at the IP layer, which means that IPs which means there is either a whitelist of allowed IP addresses or a blacklist of forbidden IP addresses.
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