[ntp:questions] Re: Undisciplined Local Clocks

Allen C brandy231 at tue2427.cwcom.net
Tue Jan 11 01:27:51 UTC 2005

"Richard B. Gilbert" <rgilbert88 at comcast.net> wrote in 
news:V9CdnS2GwKK7lX7cRVn-uQ at comcast.com:

> If you leave them out you can't serve time to clients if you become 
> unsynchronized.  If you include them you should probably include comment 
> explaining them:  mine look like this.
> #
> # Declare the local clock to be the clock of last resort.
> # It will be used to serve time in the absence of any other.
> #
> server              # Local clock, unit 0
> fudge stratum 10

That's pretty much as I had surmised.

So taking the case of a group of peers losing touch with the outside world:

If NONE ran a local clock, then all the servers would lose sync. They would 
then be unable to serve their clients, and all the clocks in the network 
would drift apart;

If ONE server ran a local clock, everything would sync to that - however 
bad - but at least the clocks on the network would stay together;

and if TWO OR MORE had a local clock then there would be some sort of 
arbitration and one server would be "elected" leader 


PS   Doesn't an unsynchronised server use the drift file to keep the best 
time possible?

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