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Site-to-Site VPN Components and Design Points |
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Design Point: Which Authentication Protocol to Use
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Consider the following when choosing an authentication protocol for VPN connections:
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If you are using a certificate infrastructure that issues user certificates, use
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the EAP-TLS authentication protocol for both PPTP and L2TP/IPSec connections. Windows NT 4.0 RRAS routers do not support EAP-TLS.
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If you must use a password-based authentication protocol, use MS-CHAP v2
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and enforce strong passwords using Group Policy. MS-CHAP v2 is supported by computers running Windows Server 2003, Windows 2000, and Windows NT 4.0 with RRAS and Service Pack 4 and later.
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VPN Protocols
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Microsoft implements industry-standard, Request-for-Comments (RFC)-compliant protocols for implementation on Windows operating systems. Windows Server 2003 includes support for two PPP-based site-to-site VPN protocols: 1. Point-to-Point Tunneling Protocol 2. Layer Two Tunneling Protocol with IPSec IPSec Tunnel Mode: Why Is It Not Implemented by Microsoft Several VPN vendors use IPSec tunnel mode for site-to-site communications. IPSec tunnel mode requires the use of a technology named XAUTH/MODCFG, which has been rejected by the Internet Engineering Task Force (IETF) because it is susceptible to man-in-the-middle attacks. Also, all vendors who support it have implemented proprietary versions of XAUTH/MODCFG that require their own third-party clients and are therefore not interoperable with each other. To promote full interoperability with all VPN services and adhere to strict IETF RFC standards, Microsoft has implemented the only ratified IPSec VPN protocol L2TP/IPSec. No approved IPSec VPN protocols are available today other than L2TP/IPSec.
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Point-to-Point Tunneling Protocol (PPTP)
Introduced in Windows NT 4.0, PPTP leverages PPP user authentication and MPPE to encapsulate and encrypt IP traffic. When MS-CHAP v2 is used with strong passwords, PPTP is a secure VPN technology. For nonpassword-based authentication, EAP-TLS can be used in Windows Server 2003 to support user certificates. PPTP is widely supported, easily deployed, and can be used across most NATs.
PART II
VPN Deployment
Layer Two Tunneling Protocol With IPSec (L2TP/IPSec)
L2TP leverages PPP user authentication and IPSec Encapsulating Security Payload (ESP) transport mode to encapsulate and encrypt IP traffic. This combination, known as L2TP/IPSec, uses certificate-based computer identity authentication to create the IPSec security association in addition to PPP-based user authentication. L2TP/IPSec provides data integrity and data authentication for each packet. However, L2TP/IPSec requires a certificate infrastructure to allocate computer certificates and is supported by Windows Server 2003 VPN routers and other third-party VPN routers. L2TP/IPSec requires NAT traversal (NAT-T) capable endnodes to go across a NAT. Windows Server 2003 has NAT-T capability, and all client operating systems can use NAT-T with the proper download client for Microsoft Windows 98, Microsoft Windows Me, and Windows NT 4.0. Windows XP and Windows 2000 Professional can use NAT-T by obtaining the proper update from Windows Update or in the future with the installation of Service Pack 2 or Service Pack 5, respectively.
Design Point: PPTP or L2TP
Consider the following when deciding between PPTP and L2TP for site-to-site VPN connections:
PPTP can be used with Windows Server 2003, Windows 2000, and Windows
NT 4.0 with RRAS. PPTP does not require a certificate infrastructure to issue computer certificates.
PPTP-based VPN connections provide data confidentiality that is, captured
packets cannot be interpreted without the encryption key. PPTP VPN connections, however, do not provide data integrity (proof that the data was not modified in transit) or data authentication (proof that the data was sent by the authorized computer).
PPTP-based calling routers can be located behind a NAT because most NATs
include a NAT editor that knows how to properly translate PPTP tunneled data. For example, the Internet connection sharing (ICS) feature of Network Connections and the NAT/Basic Firewall routing protocol component of the Windows Server 2003 Routing and Remote Access service include a NAT editor that translates PPTP traffic from PPTP clients located behind the NAT. Answering routers cannot be behind a NAT unless there are multiple public IP addresses and a one-to-one mapping of a public IP address to the private IP address of the answering router. Also, if there is only one public address, answering routers can be behind a NAT if the NAT is configured to translate and forward the PPTP tunneled data to the VPN router. Most NATs using a single public IP address, including ICS and the NAT routing protocol component, can be configured to allow inbound traffic based on IP addresses and TCP and UDP ports. However, PPTP tunneled data does not use TCP or UDP headers. Therefore, an answering router cannot be located behind a computer using ICS or the NAT routing protocol component when using a single IP address.
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