[ntp:questions] determining time difference between two not-directly-connected computers

Bill Myers whmyers at gmail.com
Mon Jan 8 00:04:46 UTC 2007


The short answer is loopstats.  Peer the two machines, turn on
logging, and you'll have an instant, continuous log of time
differences beween the servers.

On 1/7/07, matthew.garman at gmail.com <matthew.garman at gmail.com> wrote:
> On Sun, Jan 07, 2007 at 12:30:59AM -0500, Danny Mayer wrote:
> > matthew.garman at gmail.com wrote:
> > > I've got two (x86_64 Linux) machines between which I need to
> > > determine the relative time difference.  The problem is, the
> > > machines are not directly connected and only one is connected to
> > > the Internet.
> > > ...
> >
> > What do you think that NTP does? and why don't you think that after 20+
> > years of engineering that it doesn't do a much better job?
>
> I think NTP syncrhonizes one computer's time to another.
>
> However, the two computers in question don't have a direct
> connection.  And syncing the one machine to the common server via
> NTP through VPN is not what I want to do.
>
> In our application, we need to know if there's even a few
> milliseconds of time difference between the two machines... and I'm
> just looking for some feedback on how I can accurately measure that
> difference.
>
> And I'm even curious about what kind of time difference we should
> expect when both machines are NTP time sync'ed, albeit to different
> NTP servers.
>
> Thanks,
> Matt
>
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