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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,
108 If the Basic Socket Interface Extensions for IPv6 (RFC-2553)
128 @code{-4}
132 @code{-6}
145 be used and the mode in which to operate.
149 either a DNS name or an IP address in dotted-quad notation.
159 client mode association with a number of remote servers.
160 In this mode the local clock can synchronized to the
165 client mode association with the specified remote server or local
167 In this mode the local clock can synchronized to the
176 persistent symmetric-active mode association with the specified
178 In this mode the local clock can be synchronized to
188 command mobilizes a persistent broadcast mode association.
195 In broadcast mode the local server sends periodic broadcast
215 manycast client mode association for the multicast address
230 is to operate in client mode with the remote servers that are
269 @code{-q}
317 It specifies the time-to-live
330 Versions 1-4 are the choices, with version 4 the
337 modes only, this flag enables interleave mode.
354 server, then enters the broadcast client mode, in which it
357 to avoid accidental or malicious disruption in this mode, both the
358 server and client should operate using symmetric-key or public-key
370 accidental or malicious disruption in this mode, both the server
371 and client should operate using symmetric-key or public-key
380 exchange with the server, then enters the broadcast client mode, in
383 in order to avoid accidental or malicious disruption in this mode,
384 both the server and client should operate using symmetric-key or
385 public-key authentication as described in
408 specification RFC-1305 defines a scheme which provides
412 operating in Cipher Block Chaining (CBC) mode, commonly called
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
518 is manycast mode, in which clients periodically troll
523 cryptographic authentication can be used in this mode.
525 of manycast mode is that potential servers need not be
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,
591 and verifies the source with digital signatures and any of several
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
616 @code{ntp-keygen(1ntpkeygenmdoc)}
632 those based on RSA and DSA digital signatures.
746 Bob sends Cathy a thing called a crypto-NAK, which tells her
770 @code{ntp-keygen(1ntpkeygenmdoc)}
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
1031 clock address in dotted-quad notation.
1053 address in dotted-quad notation, The final message field includes the
1071 show time offset (seconds), frequency offset (parts per million -
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.
1206 server, usually specified as a compile-time constant.
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.
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.
1319 generation set by a fixed name.
1394 @subsubsection The Kiss-of-Death Packet
1402 for this purpose called the "kiss-of-death" (KoD) packet.
1404 to zero and the reference identifier field set to a four-byte
1444 and a kiss-o'-death packet returned if enabled.
1489 where a value of -1 means "unlimited", the current default.
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
1555 to become the default in ntp-4.4.
1597 Decline to provide mode 6 control message trap service to matching
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
1727 in burst mode in order to reliably set the host clock
1730 in a volley of eight client/server at 2-s intervals
1739 in ordinary client/server mode.
1743 and the effects of implosion due to near-simultaneous
1911 re-associate accordingly.
1919 @code{-q}
1927 @code{-q}.
1935 Each time a manycast client sends a client mode packet
1950 This is in general transparent in client/server mode.
1976 broadcast mode, attempts to perform a replay attack are possible.
1987 and is most useful in manycast mode.
2040 In manycast mode these values are used in turn
2041 in an expanding-ring search.
2048 satellite and modem reference clocks plus a special pseudo-clock
2068 "Pulse-per-second (PPS) Signal Interfacing"
2116 number in the range 0-3.
2135 @code{mode}
2176 device-dependent time offsets and four flags that can be included
2193 involving both a reference clock and a pulse-per-second (PPS)
2203 @item @code{server} @code{127.127.}@kbd{t}.@kbd{u} @code{[@code{prefer}]} @code{[@code{mode} @kbd{int}]} @code{[@code{minpoll} @kbd{int}]} @code{[@code{maxpoll} @kbd{int}]}
2220 @item @code{mode} @kbd{int}
2221 Specifies a mode number which is interpreted in a
2222 device-specific fashion.
2244 @item @code{fudge} @code{127.127.}@kbd{t}.@kbd{u} @code{[@code{time1} @kbd{sec}]} @code{[@code{time2} @kbd{sec}]} @code{[@code{stratum} @kbd{int}]} @code{[@code{refid} @kbd{string}]} @code{[@code{mode} @kbd{int}]} @code{[@code{flag1} @code{0} @code{|} @code{1}]} @code{[@code{flag2} @code{0} @code{|} @code{1}]} @code{[@code{flag3} @code{0} @code{|} @code{1}]} @code{[@code{flag4} @code{0} @code{|} @code{1}]}
2259 the driver, a fixed-point decimal number in seconds.
2287 Specifies a fixed-point decimal number in seconds, which is
2288 interpreted in a driver-dependent way.
2307 @item @code{mode} @kbd{int}
2308 Specifies a mode number which is interpreted in a
2309 device-specific fashion.
2360 @code{-f}
2373 in parts-per-million (PPM).
2384 a 6-bit code.
2422 Enables processing of NTP mode 7 implementation-specific requests
2433 using standard mode 6 requests.
2456 receives a crypto-NAK packet that
2461 a properly forged and appropriately delivered crypto-NAK packet
2504 receives a crypto-NAK packet that
2509 a properly forged and appropriately delivered crypto-NAK packet
2557 opens, and whether input is dropped without processing.
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}
2754 @item @code{nonvolatile} @kbd{threshold}
2756 @kbd{threshold}
2759 (frequency file) will be written, with a default value of 1e-7 (0.1 PPM).
2762 exceeds the threshold, the file is written and the
2763 @code{threshold}
2764 becomes the new threshold value.
2765 If the threshold is not exceeeded, it is reduced by half.
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,
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".
2841 @code{config-from-file}
2858 @code{saveconfig\ ntp-%Y%m%d-%H%M%S.conf}.
2929 parts-per-million.
2934 huff-n'-puff filter span, which determines the most recent interval
2942 The argument is the panic threshold, normally 1000 s.
2947 The argument is the step threshold, which by default is 0.128 s.
2953 disabled if the step threshold is set to zero or greater than the
2956 The argument is the step threshold for the backward direction,
2964 each direction of step threshold are either
3003 mode these values are used in-turn in an expanding-ring search.
3015 In manycast mode these values are used in turn in
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
3070 files are really digital