Choosing Between PPTP and L2TP/IPSec
One of the choices to make when you're deploying Windows Server 2003–based VPNs is whether to use L2TP/IPSec or PPTP. Windows XP and Windows 2000 VPN client and server computers support both L2TP/IPSec and PPTP by default. Both PPTP and L2TP/IPSec use PPP to provide an initial envelope for the data and then append additional headers for transport through the Internet. PPTP and L2TP also provide a logical transport mechanism to send PPP payloads and provide tunneling or encapsulation so that PPP payloads based on any protocol can be sent across the Internet. PPTP and L2TP rely on the PPP connection process to perform user authentication and protocol configuration.
There are a few differences between the PPTP ...
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