Windows 2008 Active Directory: Dynamic DNS Facts

Dynamic DNS Facts

With Dynamic DNS (DDNS), resource records can be created automatically on a DNS server. Without dynamic updates, all A (host) and PTR (pointer) records must be configured manually. With dynamic updates, records are created and deleted automatically. Dynamic DNS is required to support Active Directory.

A dynamic update occurs when a client modifies its corresponding resource record on the DNS server. Dynamic updates occur when:

  • A network connection’s IP address is added, deleted, or changed.
  • The DHCP server changes or renews an IP address lease.
  • The client’s DNS information is manually changed using ipconfig /registerdns.
  • The client boots.
  • A server is promoted to a domain controller.

The default configuration for dynamic DNS is as follows:

  • Windows clients (2000 and above) create their   A records with the DNS server. Windows 9x/Me/NT   clients do not support dynamic DNS.
  • The DHCP server registers the PTR record   with the DNS server for clients capable of   dynamic updates. The DHCP server updates   both the A and PTR records for clients that   do not support dynamic updates.
  • Dynamic updates must be enabled on the zone.   By default:
    • Dynamic updates are not enabled on primary zones. You can enable     dynamic updates when you create the zone     or modify the zone properties later to enable     this feature.
    • Dynamic updates are enabled on Active Directory-integrated zones.     Note: When you convert a primary zone to an Active     Directory-integrated zone, the current dynamic     update setting is retained.

    For Active Directory-integrated zones, you   can choose to use secure dynamic updates.   With secure dynamic updates, only domain   members can create records, and only the   original client can modify or remove records.


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