Nowadays, OpenVPN is available not only on traditional PC-style platforms, but also on smart phones and tablets running Android or Apple iOS, as well as embedded hardware and home routers. For Android, there are two apps: OpenVPN for Android, which is fully open source, and OpenVPN Connect for Android, which is the official app from OpenVPN Technologies, Inc. We will cover both these Android apps, as there are some subtle differences in using them.
In this chapter, we will first explore how to use OpenVPN on Android and iOS, and how to best integrate smart phone use into an existing OpenVPN setup.
Next, we will explore how OpenVPN can be used on small hardware, such as home routers running the popular DD-WRT Linux-based firmware. We will show how to use a home router as both an OpenVPN client and an OpenVPN server.
An important note is that both Android and iOS only support tun mode. This is a limitation of the operating system, not...