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Diffstat (limited to 'contrib/ntp/html/hints/notes-xntp-v3')
| -rw-r--r-- | contrib/ntp/html/hints/notes-xntp-v3 | 119 |
1 files changed, 0 insertions, 119 deletions
diff --git a/contrib/ntp/html/hints/notes-xntp-v3 b/contrib/ntp/html/hints/notes-xntp-v3 deleted file mode 100644 index ba027f2..0000000 --- a/contrib/ntp/html/hints/notes-xntp-v3 +++ /dev/null @@ -1,119 +0,0 @@ -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. |
