Zone properties in .NET framework

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A final management task for zones is the possible configuration options found on the zone s properties sheets. If you select the desired zone in the left pane of the console and then click Action Properties, the properties sheets for that zone appear. On the General tab, shown in Figure 18-22, you have a few options. First, you can pause the zone on the server by clicking the Pause button. This enables you to
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perform troubleshooting or maintenance, but of course, prevents the server from servicing query requests. You can also change the type of zone, such as from Active Directory integrated to standard, by clicking the Change button. A very important part of this tab is the dynamic updates drop-down menu. Remember that Windows 2000 DNS is dynamic, and the Active Directory assumes you implement DNS (whether Microsoft or not) that can perform dynamic updates. The dropdown menu enables you to allow or not allow dynamic updates (or use only secure updates). You need to allow dynamic updates in order for DNS to function properly for the Active Directory. Finally, the General tab enables you to set aging/scavenging properties for the zone. If you click the Aging button, you are provided the same zone aging properties (default of 7 days) we explored earlier in the chapter.
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Figure 18-22: General tab
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The Start of Authority (SOA) tab enables you to make configuration changes to the SOA record for the zone. Remember that the SOA record defines which server is the primary server for the zone. The SOA tab, shown in Figure 18-23, provides a serial number and the name of the primary server, both of which you can change. The serial number just tells you how many changes have been made to the zone since you first created it. The number will increase each time you make a change to the zone, and this isn t something you need to manually change. It also lists the responsible
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person for the server, which can also be changed. This information provides that person s e-mail address. The remaining options enable you to change the refresh, retry, and expiration interval for the server s DNS cache. For example, the default value for the refresh interval is every 15 minutes. This tells the secondary servers to query the primary server for zone database changes every 15 minutes and to retry every ten minutes in the case of a transfer failure. You also see a default Time to Live (TTL) value.
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Figure 18-23: Start of Authority tab
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The Name Servers tab lists the name servers (NS records) for the domain. You can manually edit the list as necessary by using the Add, Edit, and Remove buttons. The WINS tab, shown in Figure 18-24, allows you to enable the DNS server to access the WINS database for name resolution if the name is not found in DNS. In environments where WINS is used (which will be in any environment that is not pure Windows 2000), this feature enables DNS to interact with WINS to determine a NetBIOS name to IP address mapping. To enable this feature, click the Use WINS forward lookup check box, enter the IP address of the WINS server(s), and click the Add button. You also have the option to not replicate the record to other DNS servers.
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Figure 18-24: WINS tab
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The Zone Transfers tab, shown in Figure 18-25, allows you to adjust how zone transfers occur. Remember that within a zone, there is one primary server that holds the primary zone database file, while there may be many secondary servers that hold secondary zone database files. Changes are made only to the primary zone database file, so all secondary zone database files must be updated through a process called zone transfer. By default, the primary server can send zone transfer data to any DNS server in the zone. You can modify this behavior by choosing to send zone transfer data to only the servers that appear on the Name Servers tab, or you can generate a specific list. You can also click the Notify button so that all servers are notified of coming zone transfers. As a general rule, you need to allow zone transfers to all DNS servers in the zone. However, the restriction options are provided to help you secure the DNS zone against unauthorized servers. For example, you can specify the authorized DNS servers on this tab so that if a disgruntled employee brings another DNS server online without permission, zone transfer would not occur since you have not included that server in the OK list.
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