Virtual Private Network (VPN) Tunneling Protocols

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

For VPN connections, you can require Point-to-Point Tunneling Protocol (PPTP) or Layer Two Tunneling Protocol (L2TP) connections, or you can allow users to attempt L2TP connections and use PPTP if they cannot connect using L2TP. If you require L2TP/IPSec authentication, you can use preshared keys or certificates. For more information about choosing a VPN strategy, see "Deploying Dial-up and VPN Remote Access Servers" in this book.