[ntp:questions] NTP vs chrony comparison (Was: oscillations in ntp clock synchronization)
David L. Mills
mills at udel.edu
Thu Jan 24 21:47:13 UTC 2008
Guys,
Reprinted without permission from the draft spec:
14. Simple Network Time Protocol (SNTP)
Primary servers and clients complying with a subset of NTP, called
the Simple Network Time Protocol (SNTPv4) [2], do not need to
implement the mitigation algorithms described in Section 9 and
following sections. SNTP is intended for primary servers equipped
with a single reference clock, as well as for clients with a single
upstream server and no dependent clients. The fully developed NTPv4
implementation is intended for secondary servers with multiple
upstream servers and multiple downstream servers or clients. Other
than these considerations, NTP and SNTP servers and clients are
completely interoperable and can be intermixed in NTP subnets.
An SNTP primary server implementing the on-wire protocol described in
Section 8 has no upstream servers except a single reference clock.
In principle, it is indistinguishable from an NTP primary server that
has the mitigation algorithms and therefore capable of mitigating
between multiple reference clocks.
Upon receiving a client request, an SNTP primary server constructs
and sends the reply packet as described in Figure 34. Note that the
dispersion field in the packet header must be updated as described in
Section 5.
Dave
Danny Mayer wrote:
>snip
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