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How to configure NTP server

Posted on 2011-02-18
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Last Modified: 2012-08-13
Hi guys

I have the following scenario

FOREST ROOT-> DC1 -> PDC EMULATOR (NTP)
                        -> DC2 -> Gets time from different source (?)
CHILD DOMAIN -> DC1 -> Gets time from PDC Emulator
                         -> DC2 -> Gets time from a network router (?)

I heard that you could sync NTP time with network devices, but is this the best practice? as far as I know you should sync time with the forest root domain holding the PDC emulator role. Am I correct? is that configuration in the child domain to sync the time with a network device correct?

Thanks very much!
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Question by:M7K
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by:KenMcF
ID: 34924927
Only the PDCe in the root domain should be getting its time from an external time source. See this blog article that explains this and the steps to configure.

http://blogs.dirteam.com/blogs/jorge/archive/2010/09/27/configuring-and-managing-the-windows-time-service-part-1.aspx
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by:M7K
ID: 34925142
Hi Ken
Thanks very much for that

Question, what would happen if one of the dcs in the child domain is syncing time with a network device? what could be the consecuences?
And also, the PDC emulator is syncing time with an Atomic clock which is very reliable, how I should configure the NTP server to the child domains? is that something that I should do by GPO or is being done automatically?

Thanks again!
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Expert Comment

by:MichaelVH
ID: 34925217
As long as the DCs in the child domain don't get out the time-reach of your PDC that wouldn't be much of a problem (though not supported nor adviced!)

You should setup other servers to sync with your PDC (and it is set like that by default).
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KenMcF earned 500 total points
ID: 34925225
It could cause major issues. One example would be if the network device had a corupt config and the time converted back or forward. This would cuase replication issues, tombstone of objects, ect..
One way to prevent this is to adjust the regisrty settings in this article below. I would sugest to only have your Root ODCe sync with a reliable external time source and then let windows sync the rest.


http://support.microsoft.com/kb/884776
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by:M7K
ID: 34925261
Brilliant thanks a lot
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