Forwarding far, far away Just as you want to keep DNS servers close to clients, you want your DNS servers to resolve as close to themselves as possible. Avoiding these nine pitfalls helps to make sure that happens. Externally, you should not allow zone transfers other than to the other DNS servers you control, so that someone scoping you out at least must work for it! If a laptop gets a record at 8am on a Monday, but unplugs and goes home and comes back on Thursday, the laptops will attempt to get the same lease. The values can be changed. Allowing zone transfers externally, and not allowing them internally Zone transfers enable a DNS server to provide the entire set of records for a namespace in response to a single query. Far too often, admins opt to skip out on setting up the in-addr. Once you build a third, add that one into the mix so no DC must rely upon itself for DNS using its local ip. The more systems you have registered in DNS, the easier it is for you to find, and manage, them. Possibly to handle many laptops coming in and out of the network. The two servers will loop the query to one another ad infinitum until you kill one of them or the network goes down. The Active Directory Tombstone Lifetime is listed in the schema. The way you have it currently set, you have two different settings but both are beyond the lease time. Therefore, the client machine will asking for a refresh every four hours. This value does not change after upgrading all domain controllers to newer Windows versions or by changing the Domain or Forest Functional Levels. So you would think a shorter lease time would work.
DHCP renewals are half the lease interval right, whcih is 4 days. If a laptop gets a record at 8am on a Monday, but unplugs and goes home and comes back on Thursday, the laptops will attempt to get the same lease. With DNS close by, all other apps will perform better because name resolution happens locally. If you do not set these settings, and the scavenging period is more than the lease, unexpected results will occur. Not setting up aging and scavenging Just as your clients and your DHCP servers both should be allowed to dynamically register DNS records, those records should be maintained. Forwarding far, far away Just as you want to keep DNS servers close to clients, you want your DNS servers to resolve as close to themselves as possible. When you run AD integrated DNS, you have the option to permit dynamic updates and require that they be secure … meaning authenticated by domain members. Therefore, this will tell you what the value is depending on what Windows operating system was used to install the very first domain controller in your infrastructure: The way you have it currently set, you have two different settings but both are beyond the lease time. That provides high availability, fault tolerance, and easy setup when running DNS on domain controllers. Tombstoned record exists for value of the DsTombstoneInterval attribute, which is 7 days by default. Keeping DNS clean makes it easier to find resources and troubleshoot issues. Far too often, admins opt to skip out on setting up the in-addr. The directory size should level out eventually, when you reach the point where the number of tombstoned records being flushed is equal to the number being created. The more systems you have registered in DNS, the easier it is for you to find, and manage, them. However, this is off by default, which can lead to old or out-of-date data in DNS, including registrations for systems that you shut down ages ago. Therefore, the client machine will asking for a refresh every four hours. All your servers and workstations that are domain-joined and running Windows can automatically register themselves into DNS. My suggestion is at least that if you want to keep an aggressively short lease, to at least make the lease period 2 days and scavenging 1 day. Avoiding these nine pitfalls helps to make sure that happens. The DnsNode object is moved to the Deleted Objects for the length of time of the tombstoneLifetime attribute value. It would seem reasonable to reconsider the DHCP Lease duration, 8 hours is, after all, extremely short. That needs to be taken into account with additional traffic, and how DNS updates, as well as how WINS handles it with the constant requests coming through. Please read the following for information on how to change it: Allow dynamic updates, or if your non-domain-joined systems are all workstations, compromise and allow DHCP to register DNS records for clients. More and more services on the Internet today are taking advantage of CDNs and multiple instances that leverage GeoDNS or other site aware approaches to provide local responses to globally distributed clients. The 7 and 7 day intervals work hand in hand with a default DHCP lease time of 8 days.
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