Setting up OpenVPN with Android and Tomato

I recently updated my router’s firmware to Advanced Tomato, which is just a modern HTML5 reskin of Tomato by Shibby, which is an update of the original Tomato for the famous WRT54GL. Tomato is a router firmware that supports a wide variety of improved functions, including QoS, realtime bandwidth monitoring and logging, easy LAN DHCP management, etc. – including an OpenVPN server and client, as well as a few other VPN solutions. Tomato supports a number of routers, including my ASUS RT-N16.