This tutorial is aimed at technical folks who want to understand the overall workings of a virtual private network or VPN. It is a survey of the VPN field, not an in-depth analysis. However, knowledge of basic networking concepts is recommended.

Part 1 started with a high-level VPN overview, proceeded to the technologies involved, and delved into the IPSec protocol; here in Part 2, we'll take a closer look at this technology and examine some VPN implementations of note.