[ntp:questions] Date Jumped
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Mon Jan 25 00:44:29 UTC 2010
Danny Mayer wrote:
> Rob wrote:
>> Maynard <maynard7fold at gmail.com> wrote:
>>> On 1/7/10, the date on our domain controller jumped to
>>> 12/7/10, and was there for about 11 minutes before it
>>> reverted back to the current date. At the time this
>>> happened, our NTP server was pointed to pool.ntp.org.
likely with a conf of:
server pool pool.ntp.org
which would have used 4 servers instead of one
>>> We also have a few Novell servers that were pointed to
>>> the same IP addresses as our Server 2003 Domain
>>> Controller, and the NTP server for our Novell network
>>> also jumped ahead.
>> This can happen any time. pool.ntp.org is a large
>> collection of servers that joined a voluntary pool
>> of servers. Any single server in this pool can send
>> the wrong date and time if it likes to, or if there
>> is an error.
> Someone with privileges changed the clock, realised his
> or her mistake and changed it back.
... and if you are using three or more NTP servers,
if one gets changed to the wrong date / time, it will
get ignored by NTP.
See all that NTP byzantine generals stuff;
NTP minsane & minclock options, ...
NTP selection / intersection / mitigation algorithms, ...
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