If you're not familiar with how DDNS and AD work together, you may not realize just how many moving parts there are with this product (check out Understanding Dynamic Update from Technet to learn more).
If this service is stopped for some reason no update will proceed.
However, in many cases when the DHCP and DNS configurations have inconsistencies, the LDNS may direct the DHCP client to a place outside the local scope, resulting in leakage of private DNS updates to the global network.
In the example shown above, the LDNS is not configured with a local zone for 168.192.
Both DHCP clients and servers can generate DNS updates.
To turn off DNS updates on Windows 2000/XP/2003 configured with DHCP clients (refer to Figure 1): To turn off DNS updates on Window Server 2000 running DHCP Server (refer to Figure 2 below): Microsoft Windows Server 2003 automatically sends DNS updates to each of its DHCP clients.