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How to Sync computer Time in a network? [message #55896]

Mon, 28 December 2020 10:05

sinpeople
Messages: 29
Registered: October 2020
Location: Singapore

Promising Member

Hi folks,

In a network where multiple clients reporting timing-sensitive information to a server, how can the synchronization of computer time be done in this situation? Time accuracy needs to be <10ms difference in all computers.

Thank you!

Best Regards
David

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Re: How to Sync computer Time in a network? [message #55897 is a reply to message #55896]

Mon, 28 December 2020 13:21

dolik.rce
Messages: 1791
Registered: August 2008
Location: Czech Republic

Ultimate Contributor

Hi,

This should be the job of the system administrator(s) of those computers Smile

Network time protocol is usually used to take care of this. There are many implementations of NTP servers and clients for all platforms, so it should be an easy task.

Best regards,
Honza

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Re: How to Sync computer Time in a network? [message #55899 is a reply to message #55896]

Mon, 28 December 2020 14:22

mr_ped
Messages: 826
Registered: November 2005
Location: Czech Republic - Praha

Experienced Contributor

sinpeople wrote on Mon, 28 December 2020 10:05

Time accuracy needs to be <10ms difference in all computers.

With modern 100Mbit networks you have some chance to achieve this, but it's far from "guaranteed", and also I'm struggling to see how you will verify it.

Plus the PC itself will drift over time from the accurate time, not sure what modern PC numbers are, but back in 90's the PC RTC did drift couple of seconds per day, so you should resync often.

Overall if you *must* have all computers synced all the time, and you have no fallback/recovery plan, I have very bad feel about this, you probably shouldn't use PC and Internet for such task.

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Re: How to Sync computer Time in a network? [message #55900 is a reply to message #55896]

Mon, 28 December 2020 16:42

deep
Messages: 272
Registered: July 2011
Location: Bangalore

Experienced Member

Check these links for NTP

https://stackoverflow.com/questions/97853/whats-the-best-way -to-synchronize-times-to-millisecond-accuracy-and-precision- b

https://www.meinbergglobal.com/english/sw/ntp.htm

Warm Regards

Deepak

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Re: How to Sync computer Time in a network? [message #56201 is a reply to message #55896]

Mon, 08 February 2021 06:34

jjacksonRIAB
Messages: 227
Registered: June 2011

Experienced Member

Without further details I feel compelled to ask: are you sure you need it? I remember one case where a client wanted synchronized times for some software and he ran into tons of trust-related issues, even with NTP. The solution to this problem was simple - just let the server track all the times based on when it receives an event. Then you don't need any complex synchronization across the network.
Everyone else gave you the common answer so I just wanted to make sure you weren't overthinking it and trusting client machines too much (especially when there is money involved - imagine if someone realized they could manipulate value by simply changing their system clock).

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