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-Notes for NTP Version 3
-
-This version operates in much the same manner as Version 2 with the
-following changes and additions:
-
-1. The protocol machinery operates in conformance with the RFC1305 NTP
- Version 3 specification. The most visible characteristic of this
- version is that the poll intervals for all polls, even selected
- ones, is significantly increased. This is especially desirable when
- serving a large client population. This implementation supports
- previous versions as non-configured peers; for version-2 configured
- peers a "version 2" keyword should be included on the "peer" line.
-
-2. The configuration file has a new keyword: statfile <file>, where
- <file> is the name of a statistics file." When present, each clock
- update generates an entry of the form:
-
- <day> <sec>.<frac> <addr> <status> <offset> <delay> <disp>
-
- where <day> is the modified Julian day, <sec>.<frac> is the time of
- day, <addr> is the peer address and <status> is the peer status.
- The <offset>, <delay> and <disp> are the measured offset, delay and
- dispersion, respectively, of the peer clock relative to the local
- clock. About once per day the current file is closed and a new one
- created with names <file>.<gen>, where <gen> starts at one and
- increments for each new generation.
-
-3. A number of additional platforms are supported. See ./Config file
- for details.
-
-4. A driver for the TrueTime 468DC GOES Synchronized Clock is
- included. This driver (refclock_goes.c) should also work for other
- TrueTime radio clocks, since all use the same format.
-
-5. A replacement driver for the Spectracom 8170 WWVB Synchronized
- Clock is included. This driver (refclock_wwvb.c) (a) does not
- require a 1-pulse-per-second signal, (b) supports both format 0
- (original 8170) and format 2 (Netclock/2 and upgraded 8170), (c)
- can be connected to more than one computer and (d) automatically
- compensates for all serial baud rates.
-
-6. A driver for the German time/frequency station DCF77 is included.
- This requires a special STREAMS module.
-
-7. In Version 2 special line-discipline modules were required for the
- CHU and WWVB drivers. This code continues to work in Version 3,
- although it is no longer needed for the WWVB driver. However, this
- code does not work under STREAMS, as used in SunOS 4.1.1.
- Equivalent STREAMS modules are supplied with Version 3.
-
-8. Support for an external 1-pulse-per-second (pps) signal is
- provided. The signal is connected to a serial port (see
- xntpd/ntp_loopfilter.c for details). When present the leading edge
- of the pulse establishes the on-time epoch within an interval
- established by the selected radio clock or other NTP time server.
- Use of the pps is indicated when the tattletale displayed by ntpq
- changes from "*" to "o".
-
-9. The clock-selection and poll-update procedures have been modified
- slightly in order to achieve better performance on high speed LANs
- with compromise in performance on typical WANs.
-
-10. In order to comply with U.S. Commerce Department regulations, the DES
- encryption routine lib/authdes.c cannot be exported. For exportable
- versions of this distribution a DES-encrypted version of this routine
- lib/authdes.c.des is included along with an unencrypted version
- lib/authdes.c.export, which allows normal operation, but without the
- NTP authentication feature. Further information is available in the
- lib/authdes.c.export file.
-
-11. As an alternative to the DES-based authentication mechanism, an
- implementation of the RSA Message Digest 5 algorithm is provided.
- (see applicable copyright information in the library files).
-
-12. A driver for the Magnavox MX4200 GPS clock.
-
-13. A STREAMS module which captures carrier-detect data-lead transitions to
- connect a precision source of 1-pps, yet avoid the ugly overhead in the
- usual STREAMS processing. See the ppsclock subdirectory.
-
-14. Support for the Apple A/UX operating system and enhanced support for the
- Hewlet-Packard HP/UX operating system. See the various README and Config
- files for further information.
-
-See the COPYRIGHT file for authors and copyright information. Note that some
-modules in this distribution contain copyright information that supersedes
-the copyright information in that file.
-
-If I missed something or neglected to give due credit, please advise.
-
-David L. Mills
-University of Delaware
-31 May 1992, amended 23 July 1992, 25 October 1992
-
-Bugs and notes
-
-A bug in the original tty_clk_STREAMS.c module has been fixed.
-
-The poll-interval randomization feature of poll_update (in
-xntpd/ntp_proto.c) has been extended to apply when the poll interval is
-increased, as well as reduced. This spreads the update messages in time
-and helps avoid unpleasant bursts of messages.
-
-In the clock_select algorithm the peers selected for combining are
-limited to those survivors at the lowest stratum, not the entire list.
-This helps avoid whiplash when large numbers of peers are at the same
-stratum.
-
-The number formerly displayed by ntpq as "compliance" is now the time
-constant of integration.
-
-The DNS resolver xntpd/ntp_intres.c is now integrated into xntpd, making
-configuration of multiple hosts easier.
-
-System and peer event are now written to the system log at priority
-LOG_INFO.
-
-The leap-second code was fixed to avoid broadcasting leap warnings on
-all except the last day of June and December.
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