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

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. To illustrate just how simple IPSec is to setup in OpenBSD, let's start with an example. This involves three components: Windows Server When finished, you should have one policy that specifies MS-CHAP v2 authentication for L2TP tunnels, and one policy that specifies PEAP authentication for PPTP tunnels. We want to network two remote subnets via a fully encrypted, standard IPSec Virtual Private Network (VPN). In this post we are going to illustrate two major phases of DMVPN evolution: . For those who An IPSec example. The NBMA layer maps to “physical” underlying network while mGRE VPN is the “logical” network (tunnel internal IP addressing). If your VPN server is located on a private network (e.g. 3) Dynamic IPsec encryption 5) Cisco Express Forwarding (CEF). VPNs Illustrated: Tunnels, VPNs, and IPsec. First, let's quickly review our goals. Assuming that reader has a general understanding of what DMVPN is and a solid understanding of IPsec/CEF, we are going to describe the role and function of each component in details. My split tunneling articles illustrate servers with private addresses) then you must ensure public IPsec traffic is forwarded to the VPN server.