[ntp:questions] Date Jumped
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Null at BlackList.Anitech-Systems.invalid
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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