![]() ![]() ![]() The following example is based on a client running Linux: script-security 2 To understand this complication, an example OpenVPN client configuration is required. Unfortunately, this introduces a complication when routing all traffic through the OpenVPN connection using redirect-gateway def1. 127.0.0.1 is the localhost address, and 6876 is the chosen local port on which the obfuscation proxy is listening. For this, OpenVPN’s configuration file will have a line that will look something like socks-proxy 127.0.0.1 6876. The result is that VPN network packets are obfuscated, which makes it harder to identify the connection. These programs offer a SOCKS proxy interface on which an OpenVPN client can connect. Such programs include obfsproxy and obfs4. It is possible to host and use an obfuscation proxy to make detection of an OpenVPN connection using deep packet inspection difficult. While OpenVPN might protect information confidentiality and integrity, availability can still be negatively influenced. An obvious client-side symptom is that the connection is lost soon after it is established. Network administrators might be tempted to apply deep packet inspection to block secure connections. Not all offered Internet connections are open to the use of OpenVPN. Once servers and clients are correctly configured, all they have to do is to activate the OpenVPN client with redirect-gateway def1 somewhere in the configuration to secure all traffic from eavesdroppers and other malicious parties. Many Internet users possess an Internet connection at home that can be used to host an OpenVPN server. OpenVPN can provide a(n additional) security layer to protect traffic confidentiality and integrity. And even if the wireless connection might be completely secure, you might not want to trust the man-in-the-middle that connects the other side of it to the Internet. Or maybe it is just that the only available wireless connection is unencrypted. Alternatively, one might use a wireless card using 802.1x authentication, and one of the used RSA private keys might be stored in a device vulnerable to ROCA. An example is the use of a wireless network which might be vulnerable to the KRACK attack. This is useful if one is in an untrustworthy environment. Secured traffic can include just site-to-site communication, but an OpenVPN client can also be configured to route all other traffic to other (Internet) servers through the VPN. It allows network-savvy people to build robust virtual private network connections across the Internet and any other networks that use the TCP/IP protocol. A solution is provided, of course.Īn open-source product I like to work with is OpenVPN. In this post I explain a connectivity problem that client-side OpenVPN faces when such a proxy is approached as a local SOCKS proxy by OpenVPN. OpenVPN can be used with an obfuscation proxy, such as obfsproxy or obfs4, to avoid identification of VPN traffic through deep packet inspection. ![]()
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