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7 # EDIT THIS FILE WITH CAUTION (invoke-ntp.conf.texi)
9 # It has been AutoGen-ed May 25, 2024 at 12:03:56 AM by AutoGen 5.18.16
11 # and the template file agtexi-file.tpl
27 @code{-c}
42 host addresses written in numeric, dotted-quad form,
55 @ref{Configuration Options},
60 @ref{Authentication Support}
62 @ref{Monitoring Support}
64 @ref{Access Control Support}
66 @ref{Automatic NTP Configuration Options}
68 @ref{Reference Clock Support}
70 @ref{Miscellaneous Options}
74 @ref{Miscellaneous Options}.
108 If the Basic Socket Interface Extensions for IPv6 (RFC-2553)
128 @code{-4}
132 @code{-6}
149 either a DNS name or an IP address in dotted-quad notation.
176 persistent symmetric-active mode association with the specified
252 @ref{Authentication Options}.
269 @code{-q}
277 default is to include no encryption field.
285 option to an upper limit of 17 (36.4 h).
290 option to a lower limit of 4 (16 s).
317 It specifies the time-to-live
330 Versions 1-4 are the choices, with version 4 the
358 server and client should operate using symmetric-key or public-key
360 @ref{Authentication Options}.
367 taken to limit the span of the reply and avoid a possibly massive
371 and client should operate using symmetric-key or public-key
373 @ref{Authentication Options}.
384 both the server and client should operate using symmetric-key or
385 public-key authentication as described in
386 @ref{Authentication Options}.
408 specification RFC-1305 defines a scheme which provides
413 DES-CBC.
415 5 (MD5) algorithm using a private key, commonly called keyed-MD5.
416 Either algorithm computes a message digest, or one-way hash, which
454 @ref{Configuration Options}
509 important to note that this flag has no purpose
514 the flag has no effect on
520 @ref{Automatic NTP Configuration Options}
537 @subsubsection Symmetric-Key Cryptography
538 The original RFC-1305 specification allows any one of possibly
539 65,535 keys, each distinguished by a 32-bit key identifier, to
587 described in RFC-1305 and in addition the Autokey protocol,
605 All modes use in addition a variant of the S-KEY scheme,
606 in which a pseudo-random key list is generated and used
609 current status, briefing slides and reading list on the
610 @ref{Autonomous Authentication}
616 @code{ntp-keygen(1ntpkeygenmdoc)}
630 The current NTP distribution supports
662 model, there are no provisions to allow alternate names or aliases.
698 configuration command and no
735 Client Alice has no specific cryptotype selected.
746 Bob sends Cathy a thing called a crypto-NAK, which tells her
766 with one server and no authentication with another might not be wise.
770 @code{ntp-keygen(1ntpkeygenmdoc)}
808 list for each association depends on this interval and the current
818 protocol defined in RFC-1305.
891 @code{-k}
910 Specifies the interval between re-randomization of certain
914 deflect brute-force attacks on the algorithms of the scheme;
934 arguments are 32-bit unsigned
963 The signature length does not match the current public key.
1031 clock address in dotted-quad notation.
1053 address in dotted-quad notation, The final message field includes the
1056 @ref{Authentication Options}
1071 show time offset (seconds), frequency offset (parts per million -
1080 line of the following form to the current element of a file
1084 48773 10847.650 127.127.4.1 9714 -0.001605376 0.000000000 0.001424877 0.000958674
1090 show the peer address in dotted-quad notation and status,
1097 Enables recording of raw-timestamp statistics information.
1113 in dotted-quad notation.
1141 @item Current version @code{9546}
1142 Number of packets matching the current NTP version.
1206 server, usually specified as a compile-time constant.
1219 above (no intervening
1225 No
1272 is a 4-digit year number (e.g., 1992).
1284 The term week is defined by computing day-of-year
1288 filename base: A dot, a 4-digit year number, the letter
1290 and a 2-digit week number.
1293 .No . Ns Ar 1992W1 .
1297 file name suffix consists of a dot, a 4-digit year number, and
1298 a 2-digit month.
1309 and an 8-digit number.
1311 running at the start of the corresponding 24-hour period.
1318 It is convenient to be able to access the current element of a file
1326 hard link from the current file set element to a file without
1338 allows the current file to be accessed by a constant name.
1381 or implicitly as the result of cryptographic or rate limit
1384 or identity verification failure; rate limit violations generally
1394 @subsubsection The Kiss-of-Death Packet
1395 Ordinarily, packets denied service are simply dropped with no
1402 for this purpose called the "kiss-of-death" (KoD) packet.
1404 to zero and the reference identifier field set to a four-byte
1413 flag is set and the rate limit
1423 the client will send no further packets to the server.
1444 and a kiss-o'-death packet returned if enabled.
1483 with no mask option, may
1489 where a value of -1 means "unlimited", the current default.
1494 In the current implementation,
1497 restricts access, i.e., an entry with no flags indicates that free
1504 restrict informational queries and attempts to do run-time
1516 If this flag is set when a rate violation occurs, a kiss-o'-death
1518 KoD packets are rate limited to no more than one per minimum
1521 defaulting to 8s. Otherwise, no response is sent.
1537 number of traps a server can maintain is limited (the current limit
1555 to become the default in ntp-4.4.
1624 Deny packets that do not match the current NTP version.
1636 otherwise unconfigured; no flags are associated
1640 Remove a previously-set restriction. This is useful for
1668 with the anycast paradigm described in RFC-1546,
1700 and minimum feasible time-to-live (TTL) hops, depending
1714 in scope of the current TTL and is itself synchronized
1730 in a volley of eight client/server at 2-s intervals
1743 and the effects of implosion due to near-simultaneous
1911 re-associate accordingly.
1919 @code{-q}
1927 @code{-q}.
2017 associations until no more than
2041 in an expanding-ring search.
2048 satellite and modem reference clocks plus a special pseudo-clock
2049 used for backup or when no other clock source is available.
2068 "Pulse-per-second (PPS) Signal Interfacing"
2116 number in the range 0-3.
2176 device-dependent time offsets and four flags that can be included
2193 involving both a reference clock and a pulse-per-second (PPS)
2222 device-specific fashion.
2259 the driver, a fixed-point decimal number in seconds.
2279 @ref{Miscellaneous Options}
2287 Specifies a fixed-point decimal number in seconds, which is
2288 interpreted in a driver-dependent way.
2309 device-specific fashion.
2334 @ref{Monitoring Options}.
2360 @code{-f}
2364 hour with the current frequency computed by the daemon.
2373 in parts-per-million (PPM).
2375 the current drift value into a temporary file and then renaming
2384 a 6-bit code.
2422 Enables processing of NTP mode 7 implementation-specific requests
2456 receives a crypto-NAK packet that
2461 a properly forged and appropriately delivered crypto-NAK packet
2475 @ref{Monitoring Options}
2486 but if, in spite of the current recommendation of not using autokey,
2504 receives a crypto-NAK packet that
2509 a properly forged and appropriately delivered crypto-NAK packet
2578 @code{-I},
2579 @code{--interface},
2580 @code{-L},
2582 @code{--novirtualips}
2583 command-line options are specified in the configuration file,
2594 @code{https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list}
2596 @code{ftp://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list}.
2611 @code{update-leap(1update_leapmdoc)}
2619 @code{--enable-leap-smear}
2626 .Sy DO NOT USE THIS OPTION ON PUBLIC-ACCESS SERVERS!
2642 @quoteleft{}-@quoteright{},
2650 @quoteleft{}-@quoteright{}
2703 @code{-l}
2714 The acutal limit will be up to
2727 Lower limit on the MRU list size.
2759 (frequency file) will be written, with a default value of 1e-7 (0.1 PPM).
2761 If the difference between the current frequency and the last value written
2771 or the JJY driver (type 40, mode 100 - 180).
2775 For the JJY driver (type 40 mode 100 - 180), the argument is
2788 The next two numbers must be between 0 and one-half of the poll interval,
2795 With no arguments, internally specified default values are chosen.
2810 @code{-i}
2812 The default is 32 megabytes on non-Linux machines, and -1 under Linux.
2813 -1 means "do not lock the process into memory".
2837 Write the current configuration, including any runtime
2841 @code{config-from-file}
2856 format directives to substitute the current date and time,
2858 @code{saveconfig\ ntp-%Y%m%d-%H%M%S.conf}.
2914 no help from the support group.
2923 limit.
2929 parts-per-million.
2934 huff-n'-puff filter span, which determines the most recent interval
2936 The lower limit is
2939 is no default, since the filter is not enabled unless this command
3003 mode these values are used in-turn in an expanding-ring search.
3010 trap receiver will ensure that no messages are lost when the server
3016 an expanding-ring search.
3022 using the @code{agtexi-cmd} template and the option descriptions for the @code{ntp.conf} program.
3044 Diffie-Hellman agreement parameters