[ntp:questions] Extracting ntpq like information programmatically

David Woolley david at ex.djwhome.demon.invalid
Sat Mar 30 11:46:09 UTC 2013

Claudio Carbone wrote:

> If the algorithm knows that it's lagging by X s, why doesn't it correct 
> for that lag?

Because it assumes the error is in the measurement, not in the local 
clock, as it assumes that local clocks can't drift off that fast, once 
initial lock has been achieved.

As you are interested in measuring propagation delays, you should be 
very aware that any measurement of time involving a round trip of the 
internet is subject to significant measurement delays.

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