Linux Firewalls, Third Edition

VPN Configurations

From this point on, I'm going to talk only about IPSec-based VPN systems because I believe them to be the best VPN solution and because IPSec is now considered the de facto standard in the industry. A great deal of time could be spent discussing different VPN configurations and how things actually work. I describe the most common configurations here.

Roaming User

Let's first look at a typical VPN setup, in which there is a roaming “client” machine and a VPN gateway server located on the home network.

Let's say that you are at a conference and you occasionally want to get your email and transfer files from your home network. Typically, you would bring a laptop with you to the conference. It could be a Win32-, Mac OSX-, or Linux-based ...