[ntp:questions] Help with Testing NTP servers

David Woolley david at ex.djwhome.demon.invalid
Fri Mar 22 10:55:28 UTC 2013

David Woolley wrote:
> unruh wrote:
>> On 2013-03-20, srinivas v <s4srinivas at hotmail.com> wrote:
>>> steps:
>>> 1.Install Operating system (say windows)
>>> 2.Set incorrect date
>> Why?
>>> 3.set ntp server
>>> 4.Check date is proper now (verify it with google)
>> That certainly does not test ntpd except at a most primative level. 
> In particular, it is testing an error recovery case, which ntpd has no 
> fundamental need to handle well, using measurement tools that are not 
> accurate enough to tell if ntpd is doing its real job.

Also, note that if the date is incorrect by more than 1000 seconds, the 
standard error recovery behaviour is to shut down ntpd and wait for a 
human to work out what has gone wrong and manually fix it.

> The correct solution to that error case is better management controls, 
> to stop people messing with the time.

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