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Re: NTP issue Continued

Andrew Bridgeman corusgroup com wrote:

I am still having problems getting 40 redhat machines to use ntp and
synchronise with our Windows 2003 Cluster. I have tried a couple of things
suggested by people but have had no luck in fixing the issue. It seems
when I put either the IP of the cluster, the name of the cluster or the
fully qualified name of the cluster in the config files the ntp service
communicates with the Windows cluster straight away and all the machines
are synchronised OK. The problem comes when i leave them afterwards for an
hour or a day or even a week and look back at the time on the machines and
they are all different.

I read on the net that the communication used with ntp is UDP over port
and was wondering if i have  some kind of polling issue after the initial
start-up of ntp. Does anyone know more detail on how the ntp part works.
i.e How often does is poll the cluster server for the time or is there a
way of checking the communication on that port is working.

Any  help on this would be much appreciated.


Andrew Bridgeman

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I just tuned into this thread so sorry if anyone has already suggested this:

Windows 2003 does not include NTP by default but rather Microsoft's stripped down implementation of SNTP whic doesn't always play nice with others

If your 2003 server is not a DC you may need to set HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpServer\Enabled
to 1.

Setting the "Always a reliable time server" (I think) group policy will sometimes help Windows 2003 trick UNIX systems into synchronizing with it.

Here is Technet article that might help


The best solution IMO is to pick a couple of your Linux boxes and set them up to be time servers for the rest of the network. :-)

Stephen Carville <stephen totalflood com>
Systems Engineer
Land America
1.626.667.1450 X1326

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