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Zone aging/scavenging properties apply to an individual zone on a DNS server. To set zone-level options, right-click a zone entry, and select Properties. In the Properties dialog box, click Aging in the General tab. After you enable and configure aging/ scavenging, click OK.
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Part 6: Managing Windows Server 2003 Networking and Print Services
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Server aging/scavenging properties apply to all zones on a DNS server. To set server-level options in the DNS console, right-click a server entry, and select Set Aging/ Scavenging For All Zones. After you enable and configure aging/scavenging, click OK. You ll see a prompt telling you these settings will be applied to new Active Directory integrated zones created on the server. To apply these settings to existing zones, select Apply These Settings To The Existing Active Directory Integrated Zones before you click OK.
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In either case, the dialog box you see is similar to the one shown in Figure 27-27. To enable aging/scavenging, select Scavenge Stale Resource Records, and then set these intervals:
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No-Refresh Interval
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Sets a period of time during which a DNS client cannot reregister its DNS records. When aging/scavenging is enabled, the default interval is 7 days. This means that if a DNS client attempts to reregister its record within 7 days of creating it, the DNS server will ignore the request. Generally, this is what is wanted because each time a record is reregistered this is seen as a change that must be replicated. The no-refresh interval doesn t affect clients whose IP address has changed and who therefore need to reregister their DNS records. The reason for this is that the previous records are actually deleted and new records are then created. Sets the extent of the refresh window. Records can be scavenged only when they are older than the combined extent of the no-refresh interval and the refresh interval. When aging/scavenging is enabled, the default no-refresh interval is 7 days and the default refresh interval is 7 days. This means their combined extent is 14 days, and the DNS server cannot scavenge records until they are older than 14 days.
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Part 6: Managing Windows Server 2003 Networking and Print Services
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Refresh Interval
Figure 27-27. Set scavenging/aging options.
Implementing and Managing DNS Tip
Scavenge stale records manually In addition to configuring automatic aging/scavenging, you can manually scavenge for stale (old) records. To do this in the DNS console, right-click a server entry, and select Scavenge Stale Resource Records. When prompted to confirm the action, click Yes. You can start scavenging at the command prompt by typing dnscmd ServerName /startscavenging, where ServerName is the name or IP address of the DNS server to work with, such as NS1 or 10.10.1.52.
Configuring Logging and Checking DNS Server Logs
By default the DNS Server service is configured to record all types of events (error, warning, and informational events) in the DNS Server log. You change this behavior in the DNS console; right-click a server entry, and then select Properties. In the Properties dialog box, select the Event Logging tab. Select the appropriate logging option so that no events, errors only, or errors and warnings are logged, and then click OK. Using the DNS console, you can view only DNS-related events that have been logged in the system log by expanding the Event Viewer node in the left pane and selecting DNS events. As Figure 27-28 shows, you ll then see the current DNS events for the server. The primary events you will want to examine are error and warning events.
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Figure 27-28. Check the event logs for warnings and errors.
Troubleshooting DNS Client Service
Frequently, when you are trying to troubleshoot DNS problems, you will want to start on the client that is experiencing the problem. If you don t find a problem on the client, then try troubleshooting the DNS Server service.
Part 6: Managing Windows Server 2003 Networking and Print Services
Microsoft Windows Server 2003 Inside Out
Try Reregistering the Client
If the problem has to do with a client not showing up in DNS, force the client to reregister itself in DNS by typing ipconfig /registerdns. This works only for dynamic updates. For clients with fixed IP addressing, you must create or update the A and PTR records. Note
Although Windows NT 4 computers have an IPCONFIG command, most of the features discussed here are available only on computers running Windows 2000 or later. In addition, on Windows 95, the related command is WINIPCFG, and for Windows 98 the IPCONFIG command has a slightly different syntax.
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