[ntp:questions] Clock and Network Simulator

unruh unruh at wormhole.physics.ubc.ca
Wed Jun 30 21:14:42 UTC 2010

On 2010-06-30, David Woolley <david at ex.djwhome.demon.invalid> wrote:
> Miroslav Lichvar wrote:
>> and is using the LOCAL driver, the rest have clocks with 1ppb/s
>> wander. Between all nodes is network delay with exponential
>> distribution and a constant jitter. The simulations are repeated with
> Real world NTP networks don't behave like that, and most of the things 
> that annoy people relate to the real world behaviour.  Real networks are 
> subject to diurnal and near step changes in frequency.

? It seems you are discussing the behaviour of the clocks, not of the
network. (the network has no frequency). His simulator works with real
clocks which have exactly the behaviour you describe. Now it may be that
the network model is not the best ( random "long" delays in one way trip
time due to network overload).

> Dr Mills modelling also has this problem.

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