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Figure 31-1 When the top item in the console tree is selected, Windows Firewall With Advanced Security displays a summary of firewall settings, and includes links to additional information. Windows Firewall With Advanced Security is a snap-in for Microsoft Management Console (MMC) and is also saved as an MMC console named Wf.msc. For details about using MMC snap-ins and consoles, see Appendix C, Using and Customizing Microsoft Management Console.
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A firewall rule defines how a given network packet is handled by the Windows Firewall. A rule combines things like the port on which the packet was received, the protocol, the direction (that is, inbound to or outbound from your computer), and other aspects of the packet along with the action to take when a packet that matches those criteria is received. An exception, such as those listed in the standard Windows Firewall application, comprises one or more rules. With Windows Vista, the combinations of programs, protocols, directions, networks, ports, and actions that you can configure and turn into rules are virtually limitless. Then when you consider that you can apply these rules differently depending on the network location type (Domain, Public, or Private), the configuration possibilities are even more complex.
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For more information about network locations, see Understanding Location Types, 12.
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The active rules under which Windows Firewall is currently operating can be viewed through Windows Firewall With Advanced Security. Figure 31-2 shows the default view of Inbound Rules in Windows Firewall With Advanced Security.
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Figure 31-2 Active (enabled) rules are identified by a green icon in the leftmost column; a gray icon identifies a rule that has been defined, but is not currently enabled.
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The display includes several columns that, depending on screen resolution, might not be visible unless you scroll to the right. In Figure 31-2 you see the rule name, the group to which it belongs, its profile, whether or not the rule is enabled, and its action. Scrolling to the right reveals several other specifics about the rule, such as the name of the program the rule affects, the local and remote addresses, the local and remote ports, the protocol, and the names of users and computers to which the rule applies. The default view shows rules from all profiles (Domain, Private, and Public), all states (Enabled and Disabled), and all groups (too many to list here). It s often helpful to view a subset of the rules, such as only the rules that are currently active. To do so, apply a filter. Follow these steps to apply a filter so that you see only the currently enabled rules: 1. In the console tree of Windows Firewall With Advanced Security, select Inbound Rules.
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Advanced Security Management
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2. In the Action pane, click Filter By State and select Filter By Enabled.
Note
Notice that, with a filter in place, a small arrow appears next to the Filter By State link in the Action pane; in addition, a Clear All Filters link appears. If you re wondering why you re not seeing the rules that you believe should be available, make sure there s no filter applied!
INSIDE OUT
See all active rules
To view all active rules inbound and outbound in the console tree select Monitoring\Firewall. You can reach the same page by clicking View Active Firewall Rules on the Monitoring overview page.
As described in s 10 and 12, Windows Firewall has three different profiles Domain, Private, and Public with the appropriate one to use determined by the network location. You can see which profile your computer is currently using by selecting Monitoring in the console tree, as shown in Figure 31-3.
Creating a Rule
Windows Firewall With Advanced Security employs a wizard to assist in creating new rules. We ll demonstrate with a simple example to allow certain Internet Control Message Protocol (ICMP) traffic something you can t do with the basic Windows Firewall application. Although our example nearly duplicates an existing rule named File And Printer Sharing (Echo Request - ICMPv4-In), you ll get an idea of how the wizard works. By the time you need to create a rule perhaps using port and protocol information provided in the instructions for a program you use you and the wizard will be old friends. The TCP and UDP protocols are used to transmit data. But internet communication also relies on ICMP to communicate status, control, and error information between computers. In addition, widely used troubleshooting tools such as Ping and Tracert use ICMP to establish network connectivity. Because ICMP carries no data, it normally can t be used to break into your machine and steal information. However, hackers do use ICMP messages for scanning networks, redirecting traffic, and carrying out Denial of Service (DoS) attacks.
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