This post is a tutorial on how to run a L2TP over IPSec VPN Server for proxy purposes on a Ubuntu 10.04 LTS Server machine. Before we start the practice, let us review some theories: What is VPN? Virtual Private Network, is a technology, mainly developed to provide creation of virtual local networks with a wide geographic distribution. For example, we have a data-center and a considerable network in Bandar Abbas that requires constant maintenance and connectivity to our main …