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more on C++ programming 3 style, see The Elements of C++ Style (Bumgardner, 4 Gray, and Misfeldt 2004).

}

As previously discussed, a Windows Server 2003 VPN server can be configured with either Windows or RADIUS as its authentication or accounting provider. RADIUS provides a centralized AAA service when you have multiple VPN servers or a mix of heterogeneous dial-up and VPN equipment. RADIUS is the preferred choice when multiple technologies need authentication services. For instance, if you are running VPN services and wireless 802.1x services on your corporate network, RADIUS can handle the AAA services for both systems simultaneously thus giving single sign-on to both systems and making them use one common authenti cation service. When you configure Windows as the authentication provider, the VPN server performs the authentication of the VPN connection by communicating with a domain controller. The VPN server does this by using a secure remote procedure call (RPC) channel and authorizing the connection attempt through the dial-in properties of the user account and locally configured remote access policies. When you configure RADIUS as the authentication provider, the VPN server relies on a RADIUS server to perform both the authentication and authorization. When a VPN connection is attempted, the VPN client credentials and other connection parameters are used to create a RADIUS Access-Request message that is sent to the configured RADIUS server. If the connection attempt is both authenticated and authorized, the RADIUS server sends back a RADIUS Access-Accept message. If the connection attempt is either not authenticated or not authorized, the RADIUS server sends back a RADIUS Access-Reject message.

As with C programming, this convention is far from standard, and different environments have standardized on different convention details.

Physically networked two computers. Performed a Windows Server 2003 installation with default settings on both com puters. The computers should be named Computer1 and Computer2. (See the

1

Several naming conventions apply specifically to the C programming language. You may use these conventions in C, or you may adapt them to other languages. c and ch are character variables. i and j are integer indexes. n is a number of something. p is a pointer. s is a string.

About This Book section for specific instructions on how to perform a default installation by using the Windows Setup Wizard.)

When you configure Windows as the accounting provider, the VPN server logs VPN connection information in a local log file (SystemRoot\System32\LogFiles\Log file.log by default) based on settings configured on the properties of the Local File object in the Remote Access Logging folder in the Routing And Remote Access snap-in. When you configure RADIUS as the authentication provider, the VPN server sends RADIUS accounting messages for VPN connections on a RADIUS server, which records the accounting information. If you are using RADIUS and a Windows domain as the user account database with which to verify user credentials and obtain dial-in properties, we recommend that you use IAS. IAS is a full-featured RADIUS server (for Windows 2000 Server and Windows Server 2003) that is tightly integrated with Active Directory and the Rout ing And Remote Access service. IAS for Windows Server 2003 also supports a RADIUS proxy. When IAS is used as the RADIUS server:

Assigned the local Administrator account on both computers a strong password of your choosing. Created a private user account, with your name, that has not been granted Admin istrator privileges. Use this account for all computer activity outside the exercises in this book.

3 classic book on C programming style is C Programming Guidelines 4 (Plum 1984).

Security Alert In general, you should stay logged on as Administrator only briefly to perform administrative functions. Alternatively, you can use the Runas command-line command or the Run As shortcut menu command to invoke Administrator privileges when necessary from a Domain User account. Leaving a computer logged on as Administrator can be danger ous when you are connected to the Internet. To protect against malicious network intrusions and damaging computer viruses, be sure to log off Administrator or shut down your computer after you finish exercises in this book.

9

Preprocessor macros are in ALL_CAPS. This is usually extended to include typedefs as well. Variable and routine names are in all_lower_case. The underscore (_) character is used as a separator: lower_case is more readable than lowercase.