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NTP - polling frequency on an SBS box RRS feed

  • Question

  • Hi --

    I have an SBS box set to sync its domain time via NTP with the server pool at ntp.org:

    C:\Windows\system32>w32tm /query /status /verbose
    Leap Indicator: 0(no warning)
    Stratum: 3 (secondary reference - syncd by (S)NTP)
    Precision: -6 (15.625ms per tick)
    Root Delay: 0.0321960s
    Root Dispersion: 0.3381336s
    ReferenceId: 0x6C3D49F3 (source IP:  108.61.73.243)
    Last Successful Sync Time: 7/20/2019 2:40:38 PM
    Source: 3.pool.ntp.org
    Poll Interval: 6 (64s)

    Phase Offset: -0.0000652s
    ClockRate: 0.0155860s
    State Machine: 3 (Spike)
    Time Source Flags: 0 (None)
    Server Role: 576 (Reliable Time Service)
    Last Sync Error: 0 (The command completed successfully.)
    Time since Last Good Sync Time: 47.3590225s


    I've been analyzing traffic on this network to make sure that the firewalls are doing their job. The firewall logs show that rules concerning NTP time sync to the SBS box trigger eight (8) times, four inbound and four outbound, roughly every minute.

    Is this really necessary? What information I've been able to find about w32tm settings seems to indicate that the polling interval shown above is normal, and also that I can't really seem to do much about that. Is this true? Why would a small SBS box in a five-person office need to validate its clock against an outside source 1,440 times a day? Can I do anything to increase this poll interval?

    Thanks,
    CL

    Saturday, July 20, 2019 6:59 PM

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