Planning and Design Considerations
When deploying a site-to-site VPN solution, you must consider the following planning and design issues:
VPN protocols
Authentication methods
VPN routers
Internet infrastructure
Site network infrastructure
Authentication infrastructure
PKI
VPN Protocols
Windows Server 2008 includes support for the following site-to-site VPN protocols:
PPTP. PPTP uses PPP user authentication and MPPE encryption. When Microsoft Challenge Handshake Authentication Protocol (MS-CHAP v2) is used with strong passwords, PPTP is a secure VPN technology. For certificate-based authentication, EAP-TLS can be used with registry-based user certificates. PPTP is easily deployed and can be used across most network address translators (NATs).
L2TP/IPsec ...
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