[ntp:questions] Re: NTP and W32Time on a PDC

John Pettitt jpp at cloudview.com
Fri Feb 24 20:01:01 UTC 2006

Hash: RIPEMD160

David J Taylor wrote:
> iZZiO wrote:
>> In my lan I've two network-time-server GPS based, 10 servers (3 of
>> them ad domain controllers) and 200 workstation clients.
>> In order to obtain a reliable syncronization in the whole network I'd
>> like to use ntp on the servers (configuring 2 servers and 10 peers)
>> but without put hands on the 200 domain workstations (running
>> W32time).
>> Is it possible?  Do I need both services running on the domain
>> controllers? Do I need just NTP?
>> Thank you for help.
> iZZiO,
> I haven't tried this with DCs, but the following port of NTP has worked 
> reliably on Windows 2000 Workstation and Server, and on Windows XP Home 
> and Pro.
>   http://www.meinberg.de/english/sw/ntp.htm
> NTP replaces W32time - don't run both.
> Personally, I would recommend putting NTP on the workstations as well, but 
> I can understand that you might not want to.
> Do the two servers have Internet backup in case the GPS fails?  I'm not 
> sure what your best configuration would be - perhaps others will comment. 
> I would probably point the 10 servers at two Internet sources (your 
> firewall(s)?) plus the 2 GPS servers, giving them four NTP time sources in 
> all.  Either 2 or 3 sources would be an unfortunate choice in case of 
> failure.  With just two, which is right?  With three, what happens if one 
> fails?  I'm unclear about the benefit of peering the 10 servers, although 
> it sounds nice!
> David 
It would probably be better to give the GPS servers some Internet sources as backups and keep the
internal servers talking to the GPS boxes - that will still give redundancy.    Regarding the
workstations - unless precise timing is critical leave them running W32time and just put ntp on the
servers as this will avoid having to touch the clients.   If you do put ntp on the clients I
strongly suggest a broadcast setup so that you don't need to touch them again if the server config


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