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In nearly every environment I’ve walked into, especially those that are more mature (read: older), DNS contains a plethora of stale entries, whether statically configured and forgotten about or dynamically registered, but never deleted or scavenged. Most of those environments could benefit from implementing Active Directory DNS Scavenging. For some environments, especially smaller ones where network changes are somewhat infrequent, this may not be a big deal. However, as devices are connected, moved and ultimately disconnected, DNS records can begin to sprawl. Your users could begin to experience issues with name resolution, causing problems with accessing certain hosts, services, and resources on your network. Assuming your Active Directory is already set up, with the requisite domain, zone, and name servers configured, there are a few items within DHCP and DNS you’ll want to configure. It only takes a few minutes and may save you from a headache or two down the road. Dynamic DNS Records. In a typical environment, it’s common to see a network configured where a dynamic record can be registered by a client itself, or by the DHCP server(s) on behalf of a client. In most cases, as long as the device is powered on and connected to your network, this registration process will occur roughly every 24 hours, keeping the dynamic record fresh and active in DNS. Static DNS Records. From time to time, we admins will set up static records. These can be simple host (A) records for a device like a network printer or copier. These could be CNAME (alias) records for web servers. These could be SRV records for servers like Exchange. A static record can be created for just about anything. ![]() 24 hrs has been passed still Stale record is there, Please see the below print-screen - 'Delete this record when it become stale is set to 8/31/2012' still it is showing in my Dns management window windows-server-2008 domain-name-system windows-dns. Dec 8, 2013 - Aging is a feature that allows identifying stale DNS records. Equal to zero (0): These are static records and they never become stale. Then enable Enable automatic scavenging of stale records check box. When a resource record is scavenged, it will be deleted from the DNS server in-memory cache. One particular server's DNS record keeps deleting about once a day. The 'Delete this record when it becomes stale' is not checked off. DNS Aging and DNS Scavenging. Microsoft DNS contains a feature called DNS Aging and DNS Scavenging. At a high level, the aging process compares the age of a DNS record to that of refresh and no-refresh interval values you configure. If the record is older than the aging values, the scavenging process purges it from DNS. Microsoft Dns Delete This Record When It Becomes Stale CheckIf not, the record remains. By default, DNS Aging and Scavenging will ignore static records. However, DNS Aging and Scavenging can be configured to process static resource records in addition to dynamic resource records. If you choose to do this, you need to exercise some caution, as the timestamp (or age) of a static record doesn’t typically change. If you registered a new record 365 days ago, as far as DNS scavenging is concerned, the record is 365 days old, and will be purged. For this reason, it’s good practice to simply manually review your static records on a periodic basis to keep things clean. How often you do this is up to you and should be based on the number and frequency of changes you make to your network. Microsoft Dns Delete This Record When It Becomes Stale CheckedRecommended DNS Aging and Scavenging Values. The values you choose are up to you and your environment. If you simply select the defaults, 7 days no-refresh and 7 days refresh, a DNS record has the potential to age to 14 days old before becoming stale. ![]() Microsoft Dns Delete This Record When It Becomes Stale ChecksIf your scavenging period is set to the default setting of 7 days, the records are purged only once a week. Your DNS record can now exist for a period between 15 – 20 days. The no-refresh interval means the timestamps on your DNS records cannot be refreshed. Your clients will still dynamically register with DNS, but the timestamp won’t update.
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