NTP Server Configuration

Do i need internet to configure NTP Server in my private network?
Ajeet KumarIT ManagerAsked:
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helpfinderIT ConsultantCommented:
if you want to have time in your network synced you have to have connect to some NTP server - so basically yes, you need internet connection.
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rastoiWindows DTS expertCommented:
if your goal is not to have accurate time but just have source for aligning time in your environment, any server can claim self as "master of the time".
If you want to have your time accurate and align with external world, you need either internet connectivity to reliable time source or some time source HW device connected to server/network. there is a lot of GPS based clocks on the market available for this purpose.
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Ajeet KumarIT ManagerAuthor Commented:
i am going to configure my own ntp server than also i need internet? if yes why?
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Wilder_AdminCommented:
If its really important to have a correct time without internet there are devices existing like private clocks.
For example: http://www.amazon.com/TM1000A-GPS-Network-Time-Server/dp/B002RC3Q4Q/ref=sr_1_1?ie=UTF8&qid=1406100978&sr=8-1&keywords=ntp+server

But i do not think in a private enviroment is this used because you will not have any time based service in your lan.
So its cheaper to reset every 3 months manually by hand. Maybe by a calender entry.
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Wilder_AdminCommented:
you need the information what time it is. So you need internet to get this information. or by these gps devices.
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helpfinderIT ConsultantCommented:
as rastoi wrote, it depends if you want to have your time server synchronized with global NTP server(s) or not.
If your goal is to have just synced time in your network without need to be accurate you do not need internet connectivity. clients will communicate with your local NTP ask for a time and receive it. But in this scenario it could be time on your NTP server won´t be accurate, so all your clients will have the same (synced) time but not the same as world time.
On other hand if your local NTP server has internet connectivity it can sync accurate time with global NTP server so your clients syncing with local NTP are accurate as well
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