Mac os x dhcp ntp

Enable the Firebox as an NTP Server

It is not uncommon for a machine's internal clock to gain or lose multiple minutes in a day. Click System Preferences from the bar at the top of the screen.

Select the drop-down menu and type the name of one of the NTP servers listed above. Referenced from: Apple.

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Browse Expand Navbar. Paths to this article. Favorite Article Print Article. General Information Some services such as SSH refuse to establish connections if the time difference between the two systems exceeds some threshold for instance, if the computer and server's times differ by more than five minutes.

Perhaps it does? If so this seems rather clunky that it must be ran twice to get it to poll the server and sync the time. Assuming the Mac has already been configured to use a ntp server and its enabled but for some reason the Mac's time has drifted, the Apple commands do not appear to have a single command to tell the Mac to "sync now". At least its not clearly defined in the man page to me.

DHCP Option Manager - Zebra Technologies TechDocs

I would think that Apple would have a clearly defined command such as "systemsetup -setnetworktime" or even "systemsetup -syncnetworktime". Don't know if this helps LINK How often does this happen? At work I point the Macs to the domain controller and they update from there so I know the time is closely matched with that of the domain.

Enable NTP

What's the difference between these two options? These options can be combined, so if your clock is way off and you need to do a one-off synchronization, you should probably actually do ntpd -g -q to allow it to make a large change to the clock, then quit. If network time is enabled in System Preferences or with systemsetup , however, you should never have to do this by hand. OSX starts ntpd with -g by default, so time should be synchronized at boot even if the clock's skewed by some huge amount and should stay synchronized after that ntpd is a background service and periodically checks to see if it's still in sync.

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I see it maybe 1 or 2 times a year. I have some users who never reboot too we have no policy to force users to do it. Quote: I've used ntpdate but will have to look into ntpq. You can forego the awk bit, but ntpdate will complain not fatally about not being able to contact "Network", "Time", and "Server:".


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The -u for ntpdate just tells it to use an unpriveleged port so you don't have to stop your current ntp service. Ars Scholae Palatinae et Subscriptor. The Mighty Zoltan. Ars Legatus Legionis et Subscriptor.