[Planetlab-users] No guarantees regarding monotonically increasing time?

[Patel, Jay A]

Hi,
 
A few hours ago -- one of the nodes I was running an experiment on
(system18.ncl-ext.net) experienced a negative movement in time. I
assumed that PL nodes adjusted their clocks using NTP. Doesn't NTP
guarantee monotonically increasing time? Or, did I just observe a manual
time adjustment?
 
Has anyone experienced this?
 
Cheers,
Jay.
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