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VPNs Illustrated: Tunnels, VPNs, and IPsec Jon C. Snader
Publisher: Addison-Wesley Professional

For those who An IPSec example. Most of you will have heard of VPN, but do you understand the various protocols behind it? Having discussed the motivations behind FLEX VPN (http://wp.me/p1loe7-fJ) and presented information about positioning of Cisco IOS VPN solutions (http://wp.me/p1loe7-gy), it's now time to jump to some practical scenarios. To illustrate just how simple IPSec is to setup in OpenBSD, let's start with an example. This sample configuration is also useful to illustrate the overall structure of a FLEX VPN policy. First, let's quickly review our goals. Many people give up on IPSec after their first peek at the horrible and complex software documentation, opting instead to install some sort of commercial SSL VPN which seems much simpler. We want to network two remote subnets via a fully encrypted, standard IPSec Virtual Private Network (VPN). Find out the differences between PPTP, L2TP/IPSec, SSTP and OpenVPN Connection. This type of profile is tied to the interface (similar to what we did for a crypto-map) by means of the tunnel protection ipsec profile command.