[ntp:questions] Re: Synchronization with mobile devices and different time zones

Sergio silarri at prometeo.cps.unizar.es
Mon Oct 25 09:50:14 UTC 2004

I see. Thanks a lot for the clarification, I certainly was confused
about the time zones issue.

Well, then it's possible. But I assume there is a certain overload
involved. If a communication takes place once every seventeen minutes
and that communication is lost (e.g., no network connection
available), either the clock will not be synchronized until the next
synchronization point (17 minutes later) or the communication will be
retried until it is successful, right?



"Richard B. Gilbert" <rgilbert88 at comcast.net> wrote in message news:<uuydnUGqlKT1heTcRVn-vQ at comcast.com>...
> Sergio wrote:
> >Hi everybody,
> >
> >does anyone have any experience at using NTP to synchronize the clock
> >of computers in different countries (time zones)?
> >
> >How about when some of the computers to synchronize is a portable
> >computer with a wireless (and intermittent) connection? Is it possible
> >to use NTP then or some similar protocol to keep the clocks
> >synchronized?
> >
> >As you can see, I am interested in knowing the limitations and
> >practical applications of the protocol.
> >
> >Thanks in advance,
> >
> >Sergio
> >  
> >
> NTP does not know or care about time zones!!  NTP keeps UTC (formerly 
> known as GMT).  Local times are a matter of presentation; the O/S adds 
> or subtracts the appropriate offset to display the time zone of your choice.
> Wireless network connections should not present a problem.  As long as 
> you are within range of the access point, a wireless network should work 
> just as well as a wired network.
> If your connection is intermittent, whether it's dial-up telephone, or 
> because you move in and out of range of an access point, NTP will not 
> work as well.  The quality of the time you can keep will depend more on 
> the quality of your local clock (usually poor and out of your control 
> anyway; computers were not designed to serve as clocks).  It will also 
> depend on how often ntpd is able to get a response from a server.  If 
> everything is working very well, once every seventeen minutes is enough.
> If your computer goes into some power saving mode, NTP may not work very 
> well or may not work at all.

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