On Thu, Sep 2, 2010 at 2:10 PM, Worley, Dale R (Dale) <[email protected]> wrote: > ________________________________________ > From: [email protected] > [[email protected]] On Behalf Of Todd Hodgen > [[email protected]] > > I’m wanting to run a sipXecs system without internet access, or access to an > external NTP server for Demonstration purposes. Does anyone know a way to > work around the need for an NTP server, and keep the time from flashing on > end devices. Without an NTP server, the boot process for Polycom phones is > delayed as they look for NTP source, and when they come up, the clock flashes > on them annoyingly. > _________________________________________ > > Set up an NTP server on some computer within the LAN, probably sipX. > Configure it to "synchronize to the local clock" if it cannot access an > authoritative server. This involves something like the following lines in > /etc/ntpd.conf: > > # Undisciplined Local Clock. This is a fake driver intended for backup > # and when no outside source of synchronized time is available. > server 127.127.1.0 # local clock > fudge 127.127.1.0 stratum 10 > > Use this NTP server as you otherwise would -- everything will sync to it. > > One problem with "local clock" use is that the frequency of local clocks is > not very accurate, although their frequency tends to be very consistent. So > your time will drift away from real time by as much as a minute a day. The > way to get around that is to have the NTP server calculate the rate of drift > and compensate for it. Add this to ntpd.conf: > > driftfile /var/lib/ntp/drift > > Then connect the system to the Internet and tell NTP about an authoritative > server. In that configuration, NTP will calcuate and save the difference > between the local clock frequency and real time, and save the value in the > "drift file". Then when you boot the system disconnected from the Internet, > NTP will tweak the local clock to run very close to true frequency. Of > course, you can't set the time from your watch better than a minute from real > time, but at least the computer's clock won't drift off. > > Dale > _______________________________________________ > sipx-users mailing list > [email protected] > List Archive: http://list.sipfoundry.org/archive/sipx-users/ >
Time sync or accurate time I should say, will get even uglier if your running this in VM's Matt P. _______________________________________________ sipx-users mailing list [email protected] List Archive: http://list.sipfoundry.org/archive/sipx-users/
