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NTP Issues Today
We were synchronized against multiple sources. Unfortunately the Navy NTP source contaminated multiple downstream sources.
Unless you can trace all your sources, if these sources all have a root source you will break.
Sid Rao | CTI Group | +1 (317) 262-4677
On Nov 21, 2012, at 8:01 AM, "Neil Harris" <neil at tonal.clara.co.uk> wrote:
> On 21/11/12 12:34, Ryan Malayter wrote:
>> On Nov 19, 2012, at 6:12 PM, "Scott Weeks" <surfer at mauigateway.com> wrote:
>>> Lesson learned: Use more than one NTP source.
>> The lesson is: use MORE THAN TWO diverse NTP sources.
>> A man with two watches has no idea what the time it actually is.
> Per David Mills, from the discussion linked upthread, this should be FOUR OR MORE...
> "Every critical server should have at least four sources, no two from the
> same organization and, as much as possible, reachable only via diverse,
> nonintersecting paths."
> Four, so that the remaining three can reach consensus even if one fails.
> -- Neil