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How Does Time Syncing Work?
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Mac Enthusiast
Join Date: Mar 2000
Location: Georgetown, TX USA
Status:
Offline
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In System Preferences/Date & Time, and using the “Set Date & Time automatically” feature, how often is the time sync’d with the server and how far out of sync one must get before the clock is automatically reset?
If the clock is not in sync, how does the server know, does the machine call Steve or is the server "pulseing" my machine?
While not hardly a problem in the scheme of things, I would like to know/learn.
Your thoughts or even a link to where the answers lie will be most appreciated.
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Harv
27" i7 iMac, 10.7.4
Those who can make you believe absurdities can make you commit atrocities. ~Voltaire
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Professional Poster
Join Date: May 2000
Location: Urbandale, IA
Status:
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"Yields a falsehood when preceded by its quotation" yields a falsehood when preceded by its quotation.
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Mac Enthusiast
Join Date: Mar 2000
Location: Georgetown, TX USA
Status:
Offline
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Thanks Oneota! Great link.
Not that I understand it all (in fact much of it is over my head), but some of it made sense. I sorta get it when one is connected to a server, but where I lose it is when one is not always connected to a server. I seldom log in to Apple, so how does Apple's server make the time handshake? Is a cookie making the call?
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Harv
27" i7 iMac, 10.7.4
Those who can make you believe absurdities can make you commit atrocities. ~Voltaire
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Senior User
Join Date: Jan 2001
Location: Mahwah, NJ USA
Status:
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Originally posted by pendragon:
Thanks Oneota! Great link.
Not that I understand it all (in fact much of it is over my head), but some of it made sense. I sorta get it when one is connected to a server, but where I lose it is when one is not always connected to a server. I seldom log in to Apple, so how does Apple's server make the time handshake? Is a cookie making the call?
Also see: man ntpdate
If not deliberately set to a local ntp server a Mac OS X system defaults to the Apple time servers. Look in /etc/ntp.conf. Mine has:
server time.apple.com minpoll 12 maxpoll 17
On setup I think the system calls home at least once to get the correct time. Usually... if one uses a file server all the servers and clients are setup to use a local time server. This is often one of the the file servers. Otherwise it can play havoc with timestamps on files.
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-DU-...etc...
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Mac Elite
Join Date: Apr 2003
Location: The City Of Diamonds
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black magic 
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Professional Poster
Join Date: May 2000
Location: Urbandale, IA
Status:
Offline
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Originally posted by pendragon:
Thanks Oneota! Great link.
Not that I understand it all (in fact much of it is over my head), but some of it made sense. I sorta get it when one is connected to a server, but where I lose it is when one is not always connected to a server. I seldom log in to Apple, so how does Apple's server make the time handshake? Is a cookie making the call?
The client just occasionally checks in with the time server and grabs the current time - the time server doesn't keep a list of machines that it's in charge of keeping in sync or anything. If your Mac isn't online all the time, then it only syncs its clock when it can.
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"Yields a falsehood when preceded by its quotation" yields a falsehood when preceded by its quotation.
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Mac Enthusiast
Join Date: Mar 2000
Location: Georgetown, TX USA
Status:
Offline
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Ah, now he gets it (maybe)!
As before Oneota, your patience and explanation is appreciated.
Re your tag line: 
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Harv
27" i7 iMac, 10.7.4
Those who can make you believe absurdities can make you commit atrocities. ~Voltaire
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