[ntp:questions] Clarification on the org, rec, xmt header fields

Noah Campbell noahcampbell at gmail.com
Sat May 16 06:20:21 UTC 2009


I have the following client/server NTP request.

Network Time Protocol
    Flags: 0x23
        00.. .... = Leap Indicator: no warning (0)
        ..10 0... = Version number: NTP Version 4 (4)
        .... .011 = Mode: client (3)
    Peer Clock Stratum: secondary reference (4)
    Peer Polling Interval: 9 (512 sec)
    Peer Clock Precision: 0.000001 sec
    Root Delay:    0.3337 sec
    Root Dispersion:    0.2679 sec
    Reference Clock ID: xxx.xxx.xxx.xxx
    Reference Clock Update Time: May 16, 2009 05:20:49.8112 UTC
    Originate Time Stamp: May 16, 2009 05:42:12.8421 UTC
    Receive Time Stamp: May 16, 2009 05:42:12.8313 UTC
    Transmit Time Stamp: May 16, 2009 05:50:45.7361 UTC


Network Time Protocol
    Flags: 0x24
        00.. .... = Leap Indicator: no warning (0)
        ..10 0... = Version number: NTP Version 4 (4)
        .... .100 = Mode: server (4)
    Peer Clock Stratum: secondary reference (3)
    Peer Polling Interval: 9 (512 sec)
    Peer Clock Precision: 0.000001 sec
    Root Delay:    0.0129 sec
    Root Dispersion:    0.0425 sec
    Reference Clock ID: xxx.xxx.xxx.xxx
    Reference Clock Update Time: May 16, 2009 05:44:30.0779 UTC
    Originate Time Stamp: May 16, 2009 05:50:45.7361 UTC
    Receive Time Stamp: May 16, 2009 05:50:45.8788 UTC
    Transmit Time Stamp: May 16, 2009 05:50:45.8789 UTC

...and I'm curious about the timestamps.  I don't quite understand the
values presented.  I've been pouring through the NTPv4 specification,
but it doesn't provide a great deal of explanation.

Thank you,
-Noah




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