Policy-Based Network Management in Software

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Policy-Based Network Management
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Vista extends support for Active Directory Group Policies to include settings for network connections and the Windows Firewall The new policies enable administrators to configure settings for both wired and wireless connections Using the Group Policy snapin for the Microsoft Management Console (MMC), you can define how workstations connect to and operate within your network For example, you can define a policy that requires all wireless connections to use a certain security configuration, that all connections must be limited to a certain wireless network, or that the connection can only be made to secured networks Any updates made by users to settings managed by Group Policy are reset to the settings found in the policy upon the next Group Policy update,
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Creating Network Connections
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Figure 5-3 A number of network connection attributes can be managed in Group Policy
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enforcing your centralized configuration across your network An example of Group Policy management is shown in Figure 5-3 What used to be a locally managed or scripted activity is completely centralized in Vista The available settings include Domain Name System (DNS) server assignments, primary DNS prefix, Dynamic Host Configuration Protocol (DHCP), and program exceptions for traffic managed by Windows Firewall The settings take precedence over what may be provided locally or by DHCP DNS server properties are shown in Figure 5-4, while Windows Firewall management is shown in Figure 5-5
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Network Awareness
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Vista tracks the status of the workstation s network connections using a rich vocabulary of descriptors The status is made available to applications through a network awareness API Any application that wishes to be informed of the network connection status can register with Vista to be on the distribution list As the status changes, applications can adjust accordingly, helping to optimize performance and making for a smooth user experience
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Microsoft Windows Vista Administration
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Figure 5-4 Like other settings, client DNS metrics are managed through similar windows
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Firewall settings and Group Policies are updated based on your Network Awareness API Vista will keep the applications up to date on connectivity, including the connection status and access level (Internet, intranet, WLAN, etc)
Network Diagnostics Framework
Workstations in and out of the workplace will occasionally disconnect from a network or otherwise suffer from degraded performance Network Diagnostics Framework (NDF) is a set of technologies that will help users learn what ails the connection and give advice on how to further troubleshoot and resolve the issue without calling in to the help desk Figures 5-6 and 5-7 show how Windows Vista identifies a problem and then diagnoses the problem, respectively NDF will give users better details then Internet Explorer s famous message, The page you are looking for is currently unavailable The Web site might be experiencing technical difficulties, or you may need to adjust your browser settings Users get something that helps them navigate through the network layers and components without being network engineers When tasks fail that require network connectivity, NDF will ask the user if he or she wishes to diagnose the issue Diagnostics and advice are conducted within the context of the task, which makes the process less generic and far more helpful than in the past Vista will attempt to fix the problem, and then let you know when the problem has been worked out, as shown in Figure 5-8 Diagnostics are executed using Vista helper classes, which hold a library of resolution techniques to employ based on the application (URL, e-mail, etc) and the task type
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Creating Network Connections
Figure 5-5 Windows Firewall can be managed in Group Policy
NDF is a client-side diagnostic, so any server issues or end-to-end traffic may be beyond its reach If it fails to fix a problem, NDF offers the user options on how to report the issue or, if appropriate, reconfigure settings
Figure 5-6 NDF will identify a network issue
Microsoft Windows Vista Administration
Figure 5-7 NDF is capable of diagnosing the problem
Figure 5-8 Once the problem has been resolved, Vista will let you know
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The helper classes are part of another Vista layer that is available to NDF and other Vista services, called Windows Diagnostics Infrastructure (WDI) A helper class can determine the state of a specific network layer or component functionality It plugs into the NDF, along with other helper classes from other network components This allows the helper class to work within a common framework and determine the root cause of a networking problem For example, there is a helper class for wireless connectivity The wireless helper class plugs into NDF, which, in turn, plugs into WDI The role of the wireless helper class is to be the expert for wireless connectivity issues by collecting and analyzing information about wireless connectivity and providing the results of the analysis, with repair options to, WDI through NDF NDF is an application that looks up your issue in the WDI library and can act on your behalf based on what it finds
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