Re: What exactly does "Maximum Distance Exceded" mean?

Joseph Gwinn wrote:
In article <49ba0e33$0$505$5a6aecb4@xxxxxxxxxxxxxxxxx>,
David Woolley <david@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

Joseph Gwinn wrote:

What is this error likely telling me? What are the possibilities? What tests will tell the tale?
Your timeservers are unsynchronised, but for some reason not setting their stratum to 16.

Distance exceeded means that the combination of worst case round trip time induced error and an assumed drift of 15ppm since the last valid time on the root server (plus a few minor components) has exceeded 1 second.

How would it know of drift, in this isolated little island?

What is described here is not what is conventionally called an island. An island is a system which does not and never has had a source of correct time.

ntpd doesn't care about what the drift is in determining root distance. It simply takes the position that the actual local clock will be somewhere within +/- 15ppm of the value which would achieve perfect phase lock with true time.

The assumed maximum reasonable error therefore grows at 15 microseconds per second.
.

Relevant Pages

  • Re: Atheists are the biggest fools on Earth
    ... historical account of the creation of the world. ... >>> same island), it would be easier. ... >>> proteins to be sequenced for a large sample of species. ... What objective reason could you have? ...
    (talk.origins)
  • Re: Free Will
    ... action at a distance is real. ... is a physical reason, not just a spooky action at a distance, ... We can *reason* as well as ... but the magnets and their motion exist in the universe. ...
    (comp.ai.philosophy)
  • Re: Reproductive Selection
    ... within itself as S1 has within itself, can depend on drift. ... You have given no reason why drift can't explain "the new RC", ... There is no such thing as a "newly evolved genus". ... >> a new species is extremely unlikely to be sufficiently different from ...
    (talk.origins)
  • Re: The Speed of Light
    ... the reason we use those units is that they match ... characteristic human distance and time scales. ... (1 mile = 804672000000/149896229 nils exactly.) ... might be called a ceskick or something, ...
    (sci.physics.relativity)
  • Re: Howard Hersheys Challenge of Sean Pitmans Assumptions
    ... difference between sequence flexibility (i.e., ... island) and the distance between islands (i.e., the gap distance). ...
    (talk.origins)