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Version 3
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... This document constitutes a formal specification of the Network Time
Protocol (NTP) Version 3, which is used to synchronize timekeeping among
a set of distributed time servers and clients ...
... authentication mechanism which can
be used to control access and prevent unauthorized data modification,
while Appendix D contains a listing of differences between Version 3 of
NTP and previous versions. Appendix E expands on issues involved with
...
... versions these two objectives were combined in one document.
While the architecture assumed in Version 3 is identical to Version 2,
the protocols and algorithms ...
...
Version 3 neither changes the protocol in any significant way nor
obsoletes previous versions or existing implementations. The main
...
... rigorously examined and error bounds established in order to improve
performance, provide a model for correctness assertions and indicate
timekeeping quality to the user. Version 3 also incorporates two new
optional features, (1) an algorithm to combine the offsets of a number
of peer ...
... overhead. Following is a summary of previous versions of the
protocol together with details of the Version 3 changes.
...
... cryptographic keys and procedures described in Appendix C are new to
Version 2 and continued in Version 3, along with the corresponding
variables, procedures and authenticator fields. In the NTP ...
...
Version 2 and Version 3 incorporate several sanity checks designed to
avoid disruptions due to unsynchronized, duplicate or bogus timestamp ...
... avoid disruptions due to unsynchronized, duplicate or bogus timestamp
information. The checks in Version 3 are specifically designed to detect
lost or duplicate packets and resist invalid timestamps. The leap-
...
... measured data over typical Internet paths and with typical local-clock
hardware. In version 3 the phase-lock loop model was further refined to
provide an adaptive-bandwidth feature that automatically adjusts for the
...
...
In Version 3 The local-clock algorithm has been overhauled to improve
stability and accuracy. Appendix G presents a detailed mathematical
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... Several inconsistencies and minor errors in previous versions have been
corrected in Version 3. The description of the procedures has been
rewritten in pseudo-code augmented by English commentary for clarity and
...
...
In Version 3 changes were made to the way delay, offset and dispersion
are defined, calculated and processed in order to reliably bound the
errors inherent in the time-transfer procedures. In particular, the
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