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CHapTER 25 Configuring Windows Networking
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For EAP method vendors, EAPHost provides support for EAP methods already developed for Windows Server 2003 and Windows XP, as well as an easier method of developing new EAP methods . Certified EAP methods can be distributed with Windows Update . EAPHost also allows better classification of EAP types so that the built-in 802 .1X- and PPP-based Windows supplicants can use them . For supplicant method vendors, EAPHost provides support for modular and pluggable supplicants for new link layers . Because EAPHost is integrated with NAP, new supplicants do not have to be NAP aware . To participate in NAP, new supplicants only need to register a connection identifier and a callback function that informs the supplicant to re-authenticate . For more information, read EAPHost in Windows at http://technet.microsoft.com/en-us /magazine/cc162364.aspx .
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Layered Service provider (LSp)
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The Windows Sockets (Winsock) Layered Service Provider (LSP) architecture resides between the Winsock dynamic-link library (DLL), which applications use to communicate on the network, and the Winsock kernel-mode driver (Afd .sys), which communicates with network adapter drivers . LSPs are used in several categories of applications, including:
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Proxy and firewalls . Content filtering . Virus scanning . Adware and other network data manipulators . Spyware and other data-monitoring applications . Security, authentication, and encryption .
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Windows Vista and Windows 7 include several improvements to LSPs to enable more powerful network applications and better security:
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Adding and removing LSPs is logged to the System Event Log . Administrators can use these events to determine which application installed an LSP and to troubleshoot failed LSP installations . A new installation API (WSCInstallProviderAndChains) provides simpler, more reliable LSP installations . New facilities categorize LSPs and allow critical system services to bypass LSPs . This can improve reliability when working with flawed LSPs . A diagnostics module for the Network Diagnostics Framework allows users to selectively remove LSPs that are causing problems .
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Windows Sockets Direct path for System area Networks
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Windows Sockets Direct (WSD) enables Winsock applications that use TCP/IP to obtain the performance benefits of system area networks (SANs) without application modifications . SANs are a type of high-performance network often used for computer clusters .
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Improved APIs CHapTER 25 1209
WSD allows communications across a SAN to bypass the TCP/IP protocol stack, taking advantage of the reliable, direct communications provided by a SAN . In Windows Vista and Windows 7, this is implemented by adding a virtual switch between Winsock and the TCP/IP stack . This switch has the ability to examine traffic and pass communications to a SAN Winsock provider, bypassing TCP/IP entirely . Figure 25-13 illustrates this architecture .
Application Winsock User Switch SAN Winsock Provider SAN Winsock Driver
Base Winsock Provider
TCP/IP Kernel
SAN NDIS MiniPort
SAN Network Adapter
FIgURE 25-13 WSD enables improved performance across SANs by selectively bypassing TCP/IP using a
virtual switch .
How to Configure Wireless Settings
Users want to stay constantly connected to their networks, and wireless LANs and wireless WANs are beginning to make that possible . However, managing multiple network connections can be challenging, and users often have difficulty resolving connectivity problems . As a result, users place more calls to support centers, increasing support cost and user frustration . You can reduce this by configuring client computers to connect to preferred wireless networks . Windows will connect automatically to most wired networks . Wireless networks, however, require configuration before Windows will connect to them . You can connect Windows computers to wireless networks in three different ways:
Manually Windows 7 includes a new user interface that makes it simple to connect to wireless networks . You can use this interface to manually configure intranet-based computers running Windows 7; users can use this method to connect to public networks when they travel .
CHapTER 25 Configuring Windows Networking
Using group Policy Group Policy settings are the most efficient way to configure any number of computers running Windows in your organization to connect to your internal wireless networks . From the command line or by using scripts Using the Netsh tool and commands in the netsh wlan context, you can export existing wireless network profiles, import them into other computers, connect to available wireless networks, or disconnect a wireless network .
After a wireless network is configured, the Wireless Single Sign-On feature executes 802 .1X authentication at the appropriate time based on the network security configuration, while simply and seamlessly integrating with the user s Windows logon experience . The following sections describe each of these configuration techniques .
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