![]() You can find SSH clients for most operating systems - see PuTTY, for example. ![]() SSH is the “secure shell” software used to make connections to shell accounts in Unix. The difference is that you wrap your OpenVPN traffic with SSH encryption instead of SSL encryption. Using OpenVPN with an SSH tunnel is similar to using it with an SSL tunnel. Please note that using an SSL tunnel will slow down your internet connection. This means that even the most brutal techniques of monitoring, censorship, throttling and traffic shaping will fail against AirVPN, because your ISP and your government will see only TCP or UDP traffic (as you prefer) on a unique port. Additionally, every Air server supports directly OpenVPN over SSH and OpenVPN over SSL. We offer OpenVPN on ports 80 TCP / UDP, 443 TCP / UDP and 53 TCP / UDP. One provider - AirVPN does this by default they state: Typically, you’ll want to install stunnel application and get your VPN provider to install the stunnel application too. This makes your OpenVPN traffic virtually indistinguishable from regular SSL traffic because Deep Packet Inspection cannot penetrate this additional layer of encryption. Using OpenVPN through an SSL tunnelĪnother method of avoiding Advance Deep Packet Inspection is to use OpenVPN through an SSL tunnel to wrap your data in another layer of encryption. There are instructions for setting up Obsfproxy with OpenVPN on this page. Obfsproxy does not encrypt your traffic, but it also does not require much overhead, so it is useful in countries with limited bandwidth (e.g., Syria or Ethiopia). In most cases, you’ll have to ask your VPN provider to set it up. To use Obfsproxy, you must install it on your computer, and it must be installed on the VPN server you are connecting to. It was created by the Tor network when China started blocking Tor nodes - but it can be used outside of the Tor network to mask VPN connections. Obfsproxy is a tool designed to make VPN connections difficult to detect. ![]() There are several ways to avoid advanced deep packet inspection, but they will probably require cooperation from your VPN providers, and they will slow down your internet connection. In cases like this, you will need more sophisticated cloaking techniques (see below). However, some governments (China and Iran) are now using methods to detect the difference between “normal” SSL encryption and VPN encryption. So using port 443 makes a lot of sense because it is very difficult to detect your traffic amongst all the other secure traffic on this port. Whenever you see “HTTPS” in a web browser address (for example, while accessing an online bank or accessing a web-based email), your browser uses an HTTPS connection on port 443. ![]() This is because 443 is the default port for HTTPS, and web browsers heavily use this protocol for secure connections. When you switch to port 443, your traffic will be camouflaged. OpenVPN uses port 80 by default, which is usually heavily monitored by firewalls. One of the simplest ways to do this is to forward your OpenVPN traffic through port 443. To avoid Deep Packet Inspection, you must hide the fact that you are using a VPN. Packet Inspection involves examining your internet traffic and determining what you are doing (for example, using a VPN). “Deep Packet Inspection” is usually done at the ISP (internet service provider) level on behalf of a government. A “packet” is a chuck of computer data sent over a network. If you need an introduction to VPNs (Virtual Private Networks), please see this article. VPN.AC uses TLS authentication to mask OpenVPN handshake packets (thus hiding them from Deep Packet Inspection).ExpressVPN (fast, excellent customer support) - uses a confidential method of packet obfuscation.These VPN providers are the best to use in countries with internet censorship:
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