TTL for dynamic update is 15 mins and can be altered.If you don’t have idea of refresh, no-refresh and scavenging interval, I have another post for it. ![]() If it won’t update within “No-refresh interval” then it will be deleted (scavenged). Client has to update itself after “refresh interval” which is 7 days by default.There are couple of things I will like to put in account. In case primary server fails to perform update operation, DNS client will try other authoritative DNS server. DNS client will send update message to authoritative server and latter will process it to perform the change. Once primary DNS server will receive this query it will respond it. For the purpose it will first send an SOA query to find authoritative server for the zone. So, in occurrence of any event described above, DNS client service will initiate dynamic update. A member server is promoted to a domain controller.At startup time, when the computer is turned on.The ipconfig /registerdns command is used to manually force a refresh of the client name registration in DNS. ![]() IP address lease change or renewal by the DHCP server.The service responsible for dynamic update is “DNS Client service” and it works in event of: Secure updates means that update will be done only for domain members while nonsecure is to update for any computer (even if they are not part of domain). 3rd option is “None” which you choose if you want to disable dynamic updates. While configuring DNS you get two option related to dynamic updates:Īctually there are 3 options, I don’t want discuss 3rd option as its very tough to understand. The process which works to register or update records in DNS is called dynamic update. Also if there is any update in IP or Name of domain computer, it gets updated in DNS. ![]() You must have observed that whenever a new computer joins domain a corresponding record is created in DNS. I do lot of Windows training and one obvious question in every class is “ what is dynamic updates in DNS and how it works ?” So, let’s discuss this much-queried topic. Anyways, I hope this post finds you in good health and spirit.
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