![]() OpenVPN Server: OpenVPN Server configured to receive OpenVPN requests from the obfsproxy Server. In response to that, Tor deployed a technology called Pluggable Transports which it can obfuscate the traffic to looks like “nothing!” that will drive the DPI evil boxes to go Crazy! The traffic is not easy recognizable! □ĭigram 2 This example is a secure connection – OpenVPN covers by obfsproxy were able to pass the DPI filtering system.Įnd user : A regular user before the Syrian Firewall has ( Obfsproxy + OpenVPN client) While Tor uses bridge relays to get around a censor that blocks by IP address, the censor can use DPI to recognize and filter Tor traffic flows even when they connect to unexpected IP addresses. Tor said “ An increasing number of censoring countries are using Deep Packet Inspection (DPI) to classify Internet traffic flows by protocol. Tor as one of the main anonymity providers, DPI was able to block its traffic over the “Digital fingerprint of it’s traffic “ Since August 2011 Syrin regime applied the DPI and they start blocking OpenVPN – L2TP/IPSec and sometimes TOR connection, in order to not allow any user has a secure connections. These boxes are very sophisticated and they don’t just filter traffic by src, dst or port, they filter traffic by the content the packets carry. These boxes are DPI (Deep Packet Inspection) and what they do is sniff out every little packet flowing through them to find specific patterns and then they provide their administrator with the option to block traffic that matches these patterns. ![]() You are about to read an outdated document, please click here to get the most updated guide on how to implement pluggable transport with OpenVPN or visit this link: ISPs are using sophisticated technologies to monitor and filter traffic. Bypassing censorship by using obfsproxy and openVPN, SSH Tunnel
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