[ntp:questions] Date Jumped

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Mon Jan 25 19:35:44 UTC 2010

Danny Mayer wrote:
> BlackLists wrote:
>> Danny Mayer wrote:
>>>> 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.
> That's not what I said.

I was merely pointing out how the OP could mitigate such
 silliness by random pool servers.

> I said that this *cannot* happen on the local server after
>  the first time it steps the clock no matter what the
>  remote servers say, even if all of the remote servers
>  agree on the time.  The step size is too large for it
>  to be processed by ntpd.
>>   See all that NTP byzantine generals stuff;
>>    NTP minsane & minclock options, ...
>>    NTP selection / intersection / mitigation algorithms, ...
> Not related.

It is relevant, to the OP's avoidance, of following others
 off a cliff in the future.

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