[ntp:questions] Standalone Windows XP/7 Machine Needs to Serve NTP

David Taylor david-taylor at blueyonder.co.uk.invalid
Mon Sep 9 18:42:56 UTC 2013

On 09/09/2013 17:20, nospam.swstadel at gmail.com wrote:
> I have a standalone network that can have no connection to the internet.  It is a small network, with one Windows XP or Windows 7 laptop, and several Linux devices all connected through a switch.
> The Windows machine needs to have the Linux devices stay on the same time as it.  Accuracy to within about 100 ms is needed.
> I cannot add hardware, such as Rubidium clocks, GPS receivers, etc.
> I have a software application that will occasionally set the PC clock on the Laptop.  The Linux devices must have the same time.
> I thought there would be a simple solution (and maybe there is) using w32time, but the literature I've seen seems to indicate that w32time won't work down to better than 1 second or so.  I wonder if this is strictly true in a situation like mine.  If w32time can be used, it seems like the AnnounceFlags should be set to 0x5, but I wonder how it will work.
> Any thoughts?

Install NTP - see:


It will do what you need, although you will likely need to use orphan 
mode.  I can't help you with that.  Stepping the time on the reference 
PC may cause problems, though, but it would for any time reference 

Adding an Internet connection would make your job a lot easier, though.
Web: http://www.satsignal.eu

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