You want the PDC Emulator in the root domain to be using NTP and all other DCs to be using NT5DS to sync time. As long as everything is within 5 minutes of each other Kerberos (within the forest realm ...
I've got what might be an unusual request-- I simply haven't ever tried to do it and manufacturer specs aren't helping much. What I'm looking for is a home-class router where the unit will also serve ...
If your Windows Server Clock Drift cannot sync time from an external NTP server and is in a warning or failed state while running, then this post may help you. Syncing the time includes running “w32tm ...