Green Tunnel

Green Tunnel is an anti-censorship utility designed to bypass DPI system that are put in place by various ISPs to block access to certain websites.

Following the installation, you are welcomed by a small window which is also the interface of the program. The GUI does not actually have any major role, but it was rather introduced to let users know whether the app is on or off.

The idea behind the tool is to help you access content that is blocked using more advanced systems also known as DPI. Generally speaking, when entering a URL, the browser sends a request to the DNS to lookup the domain name reference and supply the corresponding IP address. However, if the server is configured to block the access, that means the website is included in a blacklist and hence, you cannot open it.

This is where the app comes along, as it is designed to bypass DNS Spoofing using DNS over HTTPS and DNS over TLS protocols. While the first has the role of performing remote DNS resolutions to prevent manipulation of the server data, the latter encrypt and wraps queries and answers using the TLS protocol.

If you live in an area where there is strict censorship on VoIP, news and political websites, then there is a fair chance you tried accessing them using various VPN solutions. However, in certain countries, the ISPs go so far as to block the actual VPN protocols, thus rendering them useless.

Do not fret, as you can bypass these restrictions as well via tools that can shun the Deep Packet Inspection (DPI) systems. Green Tunnel is one of such tools that is aimed mostly at users with less technical skills, as it manages to bypass the DPI systems without you having to bother with configuration. On a side note, while the application is in Beta, the developer plans to add numerous other useful features in the future.