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Figure 11-7 The General tab on your VPN connection allows you to manage the connection s IP
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address and which connection it will dial first
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3 The Options tab, shown in Figure 11-8, allows you to configure dialing options, redialing options, and Point-to-Point Protocol (PPP) settings To configure PPP, click the PPP button You then have the option to enable the following: Enable LCP Extensions Selected by default, Link Control Protocol (LCP) extensions are used to establish and configure link and framing settings, such as maximum frame size LCP extensions include a callback option, time remaining, and identification packets, as defined in RFC 1570 The PPP standard framing format ensures that any vendor s remote access software can communicate and recognize data packets from any remote access software that adheres to the PPP standards Contact your ISP to determine whether you should disable LCP extensions Enable Software Compression Cleared by default, this option evokes PPP compression before packets are sent and evokes expansion upon receipt Users should enjoy a performance boost with this option enabled, although some compatibility issues can occur Negotiate Multi-Link For Single-Link Connections Cleared by default, this option enables the combination of multiple physical remote-access links into a single logical link to accelerate data transfers and reduce communications and connect-time costs If your remote access server
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supports this feature, you may notice improved quality This feature is incompatible with many remote access servers, however, so you should leave it disabled unless instructed otherwise 4 The Security tab (shown in Figure 11-9) allows you to select between typical and advanced configurations When selecting the typical option, you can elect to rely on a secure password or choose to use a smart card by clicking the down arrow; you also have the choice as to whether you wish to use the Windows user name and password automatically and whether you wish to require encryption When choosing the advanced configuration option, shown in Figure 11-10, you have more choices than what you get with the typical settings You can also select options for logon security and select allowed protocols Your choices for data encryption include: No Encryption Allowed (Server Will Disconnect If It Requires Encryption) Optional Encryption (Connect Even If No Encryption) Require Encryption (Disconnect If Server Declines) This is the default setting Maximum Strength Encryption (Disconnect If Server Declines)
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Figure 11-8 The Options tab of a VPN connection allows you to manage dialing options
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Figure 11-9 The Security tab of a VPN connection allows you to manage Security options
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5 When selecting logon security, you have these options: Smart Card Or Other Certificate (Encryption Enabled) Smart cards combine the security of public-key cryptography with the portability of passwords Before a smart card can be used for authentication, however, a logon certificate needs to be programmed into the card You can do this by using the Smart Card Enrollment station, which is integrated with Microsoft Certificate Services in current Windows server operating systems Protected EAP (PEAP) (Encryption Enabled) With Protected Extensible Authentication Protocol (PEAP), you can use third-party authentication protocols as well as those supplied with Vista EAP is the only authentication protocol supported by current Windows servers that enables you to use mechanisms other than passwords (such as digital certificates stored on smart cards) to verify a user s identity Unencrypted Password (PAP) Password Authentication Protocol (PAP) is password-based and transmits passwords in clear text, which makes authentication traffic vulnerable to interception by packet captures It is better than no authentication, although you should only use PAP as a fallback for clients that do not support any of the more secure protocols
You have a few choices for authentication protocols as well, including:
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Figure 11-10 The Security tab of your VPN connection also allows you to manage advanced
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Challenge Handshake Authentication Protocol (CHAP) CHAP uses one-way authentication and the same encryption key for both transmitted and received messages It is not the optimal option, although it supports remote access clients running Windows 95 and Windows NT 351, which cannot use MS-CHAP v2 Microsoft CHAP Version 2 (MS-CHAP v2) A password-based authentication protocol that enables the client and the server to mutually authenticate each other using encrypted passwords This makes it all but impossible for potential intruders to compromise passwords by capturing packets MS-CHAP v2 is the simplest and most secure option to use when your clients are running Microsoft Windows 98 or later
6 Finally, you have the option to pass your Windows user name and password for authentication by default 7 The Networking tab, shown in Figure 11-11, allows you to select between VPN protocols Your choices include: Automatic This option lets Vista detect the available VPN protocols and choose among the remaining options, preferring L2TP if it is available
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