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Working with DNS Server Settings
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DNS stores name records for a specific period of time. Each name record is assigned a TTL value. When this value expires, the record should be removed to avoid providing false positive results to users performing lookups on the name. Fortunately, the DNS server in Windows Server 2008 can perform this task automatically through server or zone scavenging. When applied to the server, scavenging cleans all active zones on the server. When applied to a particular zone, only the records for the zone are scavenged. Configuring Scavenging for All Zones To set scavenging for an entire server, you must assign the setting through the server s action menu.
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Lesson 2: Configuring and Using Domain Name System
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1. Right-click the server name in the DNS node of Server Manager and choose Set Aging/ Scavenging For All Zones. 2. Select the Scavenge Stale Resource Records check box to enable the feature. No-Refresh Interval refers to the time between the most recent refresh of a record stamp and the moment when the system allows the timestamp to be refreshed again. Refresh Interval refers to the earliest moment when a record may be updated or when it may be scavenged if no updates have been applied. The default value of seven days is sufficient for most networks. 3. Leave the default values as is and click OK. 4. Because you set the values for existing zones, DNS also enables you to set it for any future zone you create, including Active Directory integrated zones. Select the Apply These Settings To The Existing Active Directory-Integrated Zones check box and click OK. Your DNS zones are set to remove stale records. Make sure you apply these settings to every DNS server in your network. Make this part of your default configuration for DNS servers. If you need to modify the setting for a single zone, you must use the Properties dialog box for that zone. Zone scavenging is performed by using the General tab and clicking the Aging button. You ll note that in the server s context menu, you can also manually initiate scavenging by clicking Scavenge Stale Resource Records. You use this operation when you discover that your servers are sending out stale data. If you do discover that records are stale, you can also use the Clear Cache command from the same context menu. Because the DNS server relies heavily on the in-memory cache to improve performance, you might have scavenged records from the database but find they are still in the cache, which might still be providing false positives. Finalizing FLZ Configuration When you examine the Properties dialog box for a FLZ, you ll find that there are several options you can set for each zone. Make a point of examining these options and configure the following settings for each production DNS zone as a best practice:
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On the General tab, make sure each internal DNS zone is Active Directory-Integrated, uses the proper replication scope, and supports Secure Only dynamic updates.
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Domain-based DNS zones should replicate to all DNS servers in the domain. Each DC that also hosts the DNS role will include the zone. Forest DNS zones should replicate to all DNS servers in the forest. If you maintain Windows 2000 Server DCs in your network, you must use the To All Domain Controllers In This Domain (For Windows 2000 Compatibility) option because Windows 2000 Server does not support application directory partitions. You can also set replication to custom application directory partitions, but you must create the partition first.
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On the Name Servers tab, ensure that each DNS zone includes at least two name severs. Just as you would create at least two DCs for each domain, create two DNS servers for each zone as a best practice. On the WINS tab, assign WINS lookups only if you cannot use GNZs and you must deploy WINS. This lesson will discuss single-label name management further in a later section. On the Zone Transfers tab, set the name servers to which you allow this zone to be transferred upon request. If this zone is integrated with Active Directory, zone transfers are not required. This tab is mostly used for previous DNS server installations. On the Security tab, review the default security settings. These settings use the appropriate configuration for most networks, but in highly secure implementations, they might need to be revised and modified. The final tab is the SOA. SOA records identify the zone and its related information such as owner, operator, update schedules, and so on. These records include the following information:
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Serial Number, which is assigned when your zone is created. You can increment the serial number if you need to change its value. Primary Server is the master server for this zone. This is usually the server where the zone was first created. Responsible Person should list the operator name for this server. Normally, this is a standard term such as Hostmaster or Operations. By default, Windows Server 2008 assigns hostmaster.dnszonename where dnszonename is the FQDN of the zone. Responsible Person entries are based on Responsible Person records. These records are not created by default. Create a proper Responsible Person record for each zone or, at the very least, for each master DNS server and assign it to this value. The SOA lists the various intervals and time-based settings for the record. These include the Refresh Interval, the Retry Interval, the Expires After setting, and the
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