nanog mailing list archives

Re: NTP Issues Today


From: Darius Jahandarie <djahandarie () gmail com>
Date: Tue, 20 Nov 2012 19:56:40 -0500

On Tue, Nov 20, 2012 at 7:49 PM, Jimmy Hess <mysidia () gmail com> wrote:
Are you sure that you are actually using NTP to set your clock?
For you to sync with 2000,  you should have had multiple confused
peers from multiple time sources;  possibly a false radio signal....

NTP by default has a panic threshold of 1000 seconds.

This  _should_   have caused NTP to execute a panic shutdown,
instead of setting the clock back  30 million seconds.

For VMWare at least, their official recommendation[1] for NTP is to

tinker panic 0

for suspend/resume reasons. I've seen it default in some places.

[1] http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1006427

-- 
Darius Jahandarie


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