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L2TP/IPSec is the more secure of the two VPN protocols, using PPP user authentication methods and IPSec encryption to encrypt IP traffic. You can also use certificate-based computer authentication to create IPSec security associations in addition to PPP-based user authentication. L2TP/IPSec provides data integrity, data origin authentication, data confidentiality, and replay protection for each packet.
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Note Support for L2TP/IPSec is provided with Windows Server 2003, Microsoft Windows 2000 and Windows XP To use L2TP/IPSec with Microsoft Windows 98, Windows . Millennium Edition (Windows Me), or Microsoft Windows NT Workstation 4.0, download and install Microsoft L2TP/IPSec VPN Client (Ms12tp.exe). For information about Mls12tp.exe, see the Microsoft L2TP/IPSec VPN Client link on the Web Resources page at http://
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Configuring Virtual Private Networks for Remote Clients and Networks
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L2TP/IPSec and PPTP Considerations
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When implementing a VPN solution, you must choose which tunneling protocol to use. Table 10-1 lists factors that you should consider as you plan and implement a VPN solution. It also describes the advantages and disadvantages of using PPTP or L2TP/IPSec.
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Table 10-1
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Comparing PPTP and L2TP/IPSEC
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Factor Client operating systems supported
Windows 2000,Windows XP, Windows 2000,Windows XP, or Windows Server 2003, Windows NT Windows Server 2003. Workstation 4.0, Windows Me, or Windows 98. Requires a certificate infrastructure only for EAP/TLS authentication. Provides data encryption. Does not provide data integrity. To locate PPTP-based VPN clients behind a NAT, the NAT should include an editor that can translate PPTP. Requires a certificate infrastructure or a pre-shared key. Provides data encryption, data confidentiality, data origin authentication, and replay protection. To locate L2TP/IPSec based clients or servers behind a NAT, both client and server must support IPSec NAT-T.
Certificate support Security
NAT support
Exam Tip L2TP/IPSec requires a certificate or pre-shared key to authenticate the client computer. If a user can connect from one computer, but not from another, the problem may be that the client computer is not configured with the correct certificate or pre-shared key.
VPN Authentication Options
In addition to selecting a VPN tunneling protocol, you must also choose an authentication protocol and choose whether to use a RADIUS or RSA SecurID for authentication. Choosing the appropriate authentication mechanism is essential when designing a VPN implementation because not all VPN clients support the most secure authentication options. The authentication mechanism should be as secure as possible while still enabling VPN client access.
Lesson 1
Planning a Virtual Private Networking Infrastructure
VPN Authentication Method Options
The authentication protocol is used to verify the identity of the remote-access client. ISA Server 2004 supports the following VPN authentication protocols:
PAP Password Authentication Protocol (PAP) uses plaintext passwords and is the least secure authentication protocol. PAP is typically used if the remote-access client and remote-access server cannot negotiate a more secure form of authentication. SPAP The Shiva Password Authentication Protocol (SPAP) is a reversible encryption mechanism employed by Shiva. When a computer running Windows XP Professional connects to a Shiva LAN Rover, it uses SPAP, as does a Shiva client that connects to a server running Routing and Remote Access. This form of authentication is more secure than plaintext but less secure than CHAP or MS-CHAP. CHAP The Challenge Handshake Authentication Protocol (CHAP) is a challengeresponse authentication protocol that uses the Message Digest 5 (MD5) algorithm to hash the response to a challenge that the remote-access server issues. CHAP is used by various vendors of dial-in servers and client computers, including Macintosh and UNIX. Data cannot be encrypted when you use the CHAP protocol. Therefore, CHAP is not considered a secure option. MS-CHAP Microsoft CHAP (MS-CHAP) is similar to CHAP, except that MS-CHAP can be used with MPPE to encrypt data. MS-CHAP is more secure than CHAP, but use MS-CHAP only if you run earlier Microsoft operating systems that require it. Both CHAP and MS-CHAP are only as secure as the strength of the user s password. MS-CHAP version 2 MS-CHAP version 2 (MS-CHAP v2) was designed to fix many of the security issues with MS-CHAP, including the lack of mutual authentication. MS-CHAP v2 uses mutual authentication, so both the client and the server are authenticated. In addition, data is encrypted by using separate session keys for transmitted and received data, which makes it more difficult for an attacker to sniff the traffic and use a brute-force attack on the key. The session-key generation is not entirely based on the user s password, so a weak password will not necessarily leave the session vulnerable. MS-CHAP v2 is supported by VPN clients running Windows XP, Windows Server 2003, Windows 2000, Windows NT Workstation 4.0 with Service Pack 4 (SP4) and later, Windows Me or Windows 98. EAP Extensible Authentication Protocol (EAP) is the most secure remote authentication protocol. It uses certificates on both the client and the server to provide mutual authentication, data integrity, and data confidentiality. It negotiates encryption algorithms and secures the exchange of session keys. Use EAP if you are implementing multifactor authentication technologies such as smart cards or universal serial bus (USB) token devices.
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