Many deployment procedures for remote access are the same whether you are using PPTP or L2TP/IPSec, but you need to watch for several subtleties during the setup, depending on which one you want to use. When there is a difference between PPTP and L2TP/IPSec in the procedures, we have bolded the text to highlight these points. Make sure to watch for these items. Regardless of the protocol set you use, deploying remote access VPN connections using Windows Server 2003 consists of the following steps:
Deploy a certificate infrastructure
Deploy an Internet infrastructure
Deploy an authentication, authorization, and accounting (AAA) infrastructure
Deploy VPN servers
Deploy an intranet infrastructure
Deploy VPN clients
These steps are discussed in more detail in the sections that follow.