Figure 18-11: Reverse Lookup Zone window in Visual Studio .NET

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Figure 18-11: Reverse Lookup Zone window
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Managing the DNS Server
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If you select the DNS Server icon in the left pane of the DNS console and then click the Action menu, you see several tasks you perform on the DNS Server. The following list explores the tasks that appear to you on the Action menu: Set Aging/Scavenging for all zones When you select this option, a window appears, shown in Figure 18-12, that enables you to set values in order to manage the cleaning, or scavenging, of old records in the database so that all database records are correct. The properties window presents you with a no-refresh and refresh interval, both of which are set to 7 days by default. The no-refresh interval is the time between the most recent refresh of a record timestamp and the time when it can be refreshed. The refresh interval is the time between the earliest moment when a record timestamp can be refreshed and when the record can be scavenged.
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Figure 18-12: Server Aging/Scavenging Properties window
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Scavenge Stale Resource Records The Aging/Scavenging properties presented above enable DNS to remove and update records automatically. If you choose to scavenge stale resource records from the menu, you are simply choosing to manually run the scavenge process. This could be useful in circumstances where you know several resource records need to be updated.
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Update Server Data Files This option enables you to manually update the server s database files, which normally occurs when the server is shut down and at predefined intervals. You do not need to manually update the server data files under normal circumstances, but you can choose this option to force the DNS server to write all changes to the zone data files immediately. Clear Cache The DNS server maintains a cache of resolved host names to IP addresses. You can clear the cache with this option. Aside from these tasks, you can also start, stop, or pause the DNS service on the server, and you can access the DNS server properties sheets. You see several tabs, and the following sections explore your configuration options on each tab.
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Interfaces tab
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For servers that have multiple IP addresses, you can restrict which IP addresses are used to listen for DNS client query requests on the Interfaces tab, shown in Figure 18-13. By default, the server listens on all IP addresses, but you can restrict this behavior by clicking the Only the following IP addresses radio button, then entering the desired IP address(es), and clicking the Add button. You can manage the list with the Remove button if necessary.
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Figure 18-13: Interfaces tab
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Forwarders tab
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The Forwarders tab, shown in Figure 18-14, enables you to enter the IP address of DNS servers that are higher in the naming hierarchy that can be queried for name resolution. This feature enables a DNS server to forward a query request that it cannot solve. To enable this option, click the Enable forwarders check box, enter the IP address of the forwarder, and click the Add button.
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If your server is a root server, such as the one shown in Figure 18-14, the Enable forwarders option is not available since the root server is already at the top of the hierarchy.
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Figure 18-14: Forwarders tab
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Advanced tab
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You have several configuration options available on the Advanced tab, shown in Figure 18-15. You see the server version number displayed and a section with several check boxes you can choose to select: Disable recursion This option prevents recursive queries on this server. BIND secondaries This option is enabled by default and is used to bind your server to secondary servers. Fail on load if bad zone data This option ensures that if zone data is determined to be corrupt, the server service fails on loading the data.
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