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46 Next: <a href="#ntp_002econf-Description" accesskey="n" rel="next">ntp.conf Description</a>, Previous: <a href="dir.html#Top" accesskey="p" rel="prev">(dir)</a>, Up: <a href="dir.html#Top" accesskey="u" rel="up">(dir)</a> </p>
48 <span id="NTP_0027s-Configuration-File-User-Manual"></span><h1 class="top">NTP’s Configuration File User Manual</h1>
56 <h2 class="shortcontents-heading">Short Table of Contents</h2>
59 <ul class="no-bullet">
60 <li><a id="stoc-Description" href="#toc-Description">1 Description</a></li>
66 <tr><td align="left" valign="top">• <a href="#ntp_002econf-Description" accesskey="1">ntp.conf Description</a></td><td> </td><td align="left" valign="top">
68 <tr><td align="left" valign="top">• <a href="#ntp_002econf-Notes" accesskey="2">ntp.conf Notes</a></td><td> </td><td align="left" valign="top">
73 <span id="ntp_002econf-Description"></span><div class="header">
83 <tr><td align="left" valign="top">• <a href="#ntp_002econf-Notes" accesskey="1">Notes about ntp.conf</a></td><td> </td><td align="left" valign="top">
88 <span id="ntp_002econf-Notes"></span><div class="header">
90 Previous: <a href="#ntp_002econf-Bugs" accesskey="p" rel="prev">ntp.conf Bugs</a>, Up: <a href="#ntp_002econf-Description" accesskey="u" rel="up">ntp.conf Description</a> </p>
92 <span id="Notes-about-ntp_002econf"></span><h3 class="section">1.1 Notes about ntp.conf</h3>
93 <span id="index-ntp_002econf"></span>
94 <span id="index-Network-Time-Protocol-_0028NTP_0029-daemon-configuration-file-format"></span>
109 <code>-c</code>
124 host addresses written in numeric, dotted-quad form,
141 <li> <a href="#Authentication-Support">Authentication Support</a>
142 </li><li> <a href="#Monitoring-Support">Monitoring Support</a>
143 </li><li> <a href="#Access-Control-Support">Access Control Support</a>
144 </li><li> <a href="#Automatic-NTP-Configuration-Options">Automatic NTP Configuration Options</a>
145 </li><li> <a href="#Reference-Clock-Support">Reference Clock Support</a>
146 </li><li> <a href="#Miscellaneous-Options">Miscellaneous Options</a>
150 <a href="#Miscellaneous-Options">Miscellaneous Options</a>.
161 <tr><td align="left" valign="top">• <a href="#Configuration-Support" accesskey="1">Configuration Support</a></td><td> </td><td align="left" valign="top">
163 <tr><td align="left" valign="top">• <a href="#Authentication-Support" accesskey="2">Authentication Support</a></td><td> </td><td align="left" valign="top">
165 <tr><td align="left" valign="top">• <a href="#Monitoring-Support" accesskey="3">Monitoring Support</a></td><td> </td><td align="left" valign="top">
167 <tr><td align="left" valign="top">• <a href="#Access-Control-Support" accesskey="4">Access Control Support</a></td><td> </td><td align="left" valign="top">
169 <tr><td align="left" valign="top">• <a href="#Automatic-NTP-Configuration-Options" accesskey="5">Automatic NTP Configuration Options</a></td><td> </td><td align="left" valign="top">
171 <tr><td align="left" valign="top">• <a href="#Reference-Clock-Support" accesskey="6">Reference Clock Support</a></td><td> </td><td align="left" valign="top">
173 <tr><td align="left" valign="top">• <a href="#Miscellaneous-Options" accesskey="7">Miscellaneous Options</a></td><td> </td><td align="left" valign="top">
175 <tr><td align="left" valign="top">• <a href="#ntp_002econf-Files" accesskey="8">ntp.conf Files</a></td><td> </td><td align="left" valign="top">
177 <tr><td align="left" valign="top">• <a href="#ntp_002econf-See-Also" accesskey="9">ntp.conf See Also</a></td><td> </td><td align="left" valign="top">
179 <tr><td align="left" valign="top">• <a href="#ntp_002econf-Bugs">ntp.conf Bugs</a></td><td> </td><td align="left" valign="top">
186 <span id="Configuration-Support"></span><div class="header">
188 Next: <a href="#Authentication-Support" accesskey="n" rel="next">Authentication Support</a>, Up: <a href="#ntp_002econf-Notes" accesskey="u" rel="up">ntp.conf Notes</a> </p>
190 <span id="Configuration-Support-1"></span><h4 class="subsection">1.1.1 Configuration Support</h4>
200 </p><span id="Configuration-Commands"></span><h4 class="subsubsection">1.1.1.1 Configuration Commands</h4>
213 <p>If the Basic Socket Interface Extensions for IPv6 (RFC-2553)
233 <code>-4</code>
237 <code>-6</code>
254 either a DNS name or an IP address in dotted-quad notation.
283 persistent symmetric-active mode association with the specified
381 <code>-q</code>
401 minimum poll interval defaults to 6 (64 s), but can be decreased by
436 It specifies the time-to-live
450 Versions 1-4 are the choices, with version 4 the
469 <span id="Auxiliary-Commands"></span><h4 class="subsubsection">1.1.1.2 Auxiliary Commands</h4>
481 server and client should operate using symmetric-key or public-key
495 and client should operate using symmetric-key or public-key
509 both the server and client should operate using symmetric-key or
510 public-key authentication as described in
530 <span id="Authentication-Support"></span><div class="header">
532 Next: <a href="#Monitoring-Support" accesskey="n" rel="next">Monitoring Support</a>, Previous: <a href="#Configuration-Support" accesskey="p" rel="prev">Configuration Support</a>, Up: <a href="#ntp_002econf-Notes" accesskey="u" rel="up">ntp.conf Notes</a> </p>
534 <span id="Authentication-Support-1"></span><h4 class="subsection">1.1.2 Authentication Support</h4>
539 specification RFC-1305 defines a scheme which provides
544 DES-CBC.
546 5 (MD5) algorithm using a private key, commonly called keyed-MD5.
547 Either algorithm computes a message digest, or one-way hash, which
616 <code>enable</code>
651 <a href="#Automatic-NTP-Configuration-Options">Automatic NTP Configuration Options</a>
668 </p><span id="Symmetric_002dKey-Cryptography"></span><h4 class="subsubsection">1.1.2.1 Symmetric-Key Cryptography</h4>
669 <p>The original RFC-1305 specification allows any one of possibly
670 65,535 keys, each distinguished by a 32-bit key identifier, to
716 </p><span id="Public-Key-Cryptography"></span><h4 class="subsubsection">1.1.2.2 Public Key Cryptography</h4>
718 described in RFC-1305 and in addition the Autokey protocol,
736 All modes use in addition a variant of the S-KEY scheme,
737 in which a pseudo-random key list is generated and used
747 <code>ntp-keygen(1ntpkeygenmdoc)</code>
777 </p><span id="Naming-and-Addressing"></span><h4 class="subsubsection">1.1.2.3 Naming and Addressing</h4>
877 Bob sends Cathy a thing called a crypto-NAK, which tells her
898 </p><span id="Key-Management"></span><h4 class="subsubsection">1.1.2.5 Key Management</h4>
901 <code>ntp-keygen(1ntpkeygenmdoc)</code>
933 </p><span id="Authentication-Commands"></span><h4 class="subsubsection">1.1.2.6 Authentication Commands</h4>
950 protocol defined in RFC-1305.
1033 <code>-k</code>
1055 <dd><p>Specifies the interval between re-randomization of certain
1059 deflect brute-force attacks on the algorithms of the scheme;
1080 arguments are 32-bit unsigned
1084 <span id="Error-Codes"></span><h4 class="subsubsection">1.1.2.7 Error Codes</h4>
1151 <span id="Monitoring-Support"></span><div class="header">
1153 Next: <a href="#Access-Control-Support" accesskey="n" rel="next">Access Control Support</a>, Previous: <a href="#Authentication-Support" accesskey="p" rel="prev">Authentication Support</a>, Up: <a href="#ntp_002econf-Notes" accesskey="u" rel="up">ntp.conf Notes</a> </p>
1155 <span id="Monitoring-Support-1"></span><h4 class="subsection">1.1.3 Monitoring Support</h4>
1175 </p><span id="Monitoring-Commands"></span><h4 class="subsubsection">1.1.3.1 Monitoring Commands</h4>
1194 clock address in dotted-quad notation.
1215 address in dotted-quad notation, The final message field includes the
1232 show time offset (seconds), frequency offset (parts per million -
1245 </p><pre class="verbatim">48773 10847.650 127.127.4.1 9714 -0.001605376 0.000000000 0.001424877 0.000958674
1250 show the peer address in dotted-quad notation and status,
1258 <dd><p>Enables recording of raw-timestamp statistics information.
1272 in dotted-quad notation.
1334 <dt><code>filegen</code> <kbd>name</kbd> <code>[<code>file</code> <kbd>filename</kbd>]</code> <code>[<code>type</code> <kbd>typename</kbd>]</code> <code>[<code>link</code> | <code>nolink</code>]</code> <code>[<code>enable</code> | <code>disable</code>]</code></dt>
1377 server, usually specified as a compile-time constant.
1449 is a 4-digit year number (e.g., 1992).
1462 The term week is defined by computing day-of-year
1466 filename base: A dot, a 4-digit year number, the letter
1468 and a 2-digit week number.
1471 .No . Ns Ar 1992W1 .
1476 file name suffix consists of a dot, a 4-digit year number, and
1477 a 2-digit month.
1490 and an 8-digit number.
1492 running at the start of the corresponding 24-hour period.
1494 <code>enable</code>;
1523 <dt><code>enable</code> <code>|</code> <code>disable</code></dt>
1532 <span id="Access-Control-Support"></span><div class="header">
1534 Next: <a href="#Automatic-NTP-Configuration-Options" accesskey="n" rel="next">Automatic NTP Configuration Options</a>, Previous: <a href="#Monitoring-Support" accesskey="p" rel="prev">Monitoring Support</a>, Up: <a href="#ntp_002econf-Notes" accesskey="u" rel="up">ntp.conf Notes</a> </p>
1536 <span id="Access-Control-Support-1"></span><h4 class="subsection">1.1.4 Access Control Support</h4>
1585 </p><span id="The-Kiss_002dof_002dDeath-Packet"></span><h4 class="subsubsection">1.1.4.1 The Kiss-of-Death Packet</h4>
1593 for this purpose called the "kiss-of-death" (KoD) packet.
1595 to zero and the reference identifier field set to a four-byte
1620 </p><span id="Access-Control-Commands"></span><h4 class="subsubsection">1.1.4.2 Access Control Commands</h4>
1635 and a kiss-o’-death packet returned if enabled.
1681 where a value of -1 means "unlimited", the current default.
1696 restrict informational queries and attempts to do run-time
1709 <dd><p>If this flag is set when a rate violation occurs, a kiss-o’-death
1751 to become the default in ntp-4.4.
1798 <dd><p>Decline to provide mode 6 control message trap service to matching
1847 <dd><p>Remove a previously-set restriction. This is useful for
1861 <span id="Automatic-NTP-Configuration-Options"></span><div class="header">
1863 Next: <a href="#Reference-Clock-Support" accesskey="n" rel="next">Reference Clock Support</a>, Previous: <a href="#Access-Control-Support" accesskey="p" rel="prev">Access Control Support</a>, Up: <a href="#ntp_002econf-Notes" accesskey="u" rel="up">ntp.conf Notes</a> </p>
1865 <span id="Automatic-NTP-Configuration-Options-1"></span><h4 class="subsection">1.1.5 Automatic NTP Configuration Options</h4>
1880 with the anycast paradigm described in RFC-1546,
1912 and minimum feasible time-to-live (TTL) hops, depending
1942 in a volley of eight client/server at 2-s intervals
1955 and the effects of implosion due to near-simultaneous
2123 re-associate accordingly.
2131 <code>-q</code>
2139 <code>-q</code>.
2146 </p><span id="Manycast-Interactions-with-Autokey"></span><h4 class="subsubsection">1.1.5.2 Manycast Interactions with Autokey</h4>
2176 </p><span id="Broadcast-Options"></span><h4 class="subsubsection">1.1.5.3 Broadcast Options</h4>
2193 <span id="Manycast-Options"></span><h4 class="subsubsection">1.1.5.4 Manycast Options</h4>
2220 The default is to enable these replies.
2251 should be at least 4 in order to detect and discard
2260 in an expanding-ring search.
2266 <span id="Reference-Clock-Support"></span><div class="header">
2268 Next: <a href="#Miscellaneous-Options" accesskey="n" rel="next">Miscellaneous Options</a>, Previous: <a href="#Automatic-NTP-Configuration-Options" accesskey="p" rel="prev">Automatic NTP Configuration Options</a>, Up: <a href="#ntp_002econf-Notes" accesskey="u" rel="up">ntp.conf Notes</a> </p>
2270 <span id="Reference-Clock-Support-1"></span><h4 class="subsection">1.1.6 Reference Clock Support</h4>
2272 satellite and modem reference clocks plus a special pseudo-clock
2292 "Pulse-per-second (PPS) Signal Interfacing"
2340 number in the range 0-3.
2400 device-dependent time offsets and four flags that can be included
2417 involving both a reference clock and a pulse-per-second (PPS)
2425 </p><span id="Reference-Clock-Commands"></span><h4 class="subsubsection">1.1.6.1 Reference Clock Commands</h4>
2447 device-specific fashion.
2462 default to 6 (64 s).
2487 the driver, a fixed-point decimal number in seconds.
2491 precision PPS signal.
2505 <code>enable</code>
2507 <a href="#Miscellaneous-Options">Miscellaneous Options</a>
2516 <dd><p>Specifies a fixed-point decimal number in seconds, which is
2517 interpreted in a driver-dependent way.
2541 device-specific fashion.
2558 is used to enable recording monitoring
2573 <span id="Miscellaneous-Options"></span><div class="header">
2575 Next: <a href="#ntp_002econf-Files" accesskey="n" rel="next">ntp.conf Files</a>, Previous: <a href="#Reference-Clock-Support" accesskey="p" rel="prev">Reference Clock Support</a>, Up: <a href="#ntp_002econf-Notes" accesskey="u" rel="up">ntp.conf Notes</a> </p>
2577 <span id="Miscellaneous-Options-1"></span><h4 class="subsection">1.1.7 Miscellaneous Options</h4>
2600 <code>-f</code>
2613 in parts-per-million (PPM).
2625 a 6-bit code.
2628 <dt><code>enable</code> <code>[<code>auth</code> | <code>bclient</code> | <code>calibrate</code> | <code>kernel</code> | <code>mode7</code> | <code>monitor</code> | <code>ntp</code> | <code>stats</code> | <code>peer_clear_digest_early</code> | <code>unpeer_crypto_early</code> | <code>unpeer_crypto_nak_early</code> | <code>unpeer_digest_early</code>]</code></dt>
2630 <dd><p>Provides a way to enable or disable various server options.
2642 <code>enable</code>.
2663 <code>enable</code>
2668 <dd><p>Enables processing of NTP mode 7 implementation-specific requests
2679 using standard mode 6 requests.
2691 <code>enable</code>.
2699 <code>enable</code>.
2705 receives a crypto-NAK packet that
2710 a properly forged and appropriately delivered crypto-NAK packet
2720 <code>enable</code>.
2751 <code>enable</code>.
2756 receives a crypto-NAK packet that
2761 a properly forged and appropriately delivered crypto-NAK packet
2771 <code>enable</code>.
2792 <code>enable</code>.
2834 <code>-I</code>,
2835 <code>--interface</code>,
2836 <code>-L</code>,
2838 <code>--novirtualips</code>
2839 command-line options are specified in the configuration file,
2851 <code>https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list</code>
2853 <code>ftp://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list</code>.
2868 <code>update-leap(1update_leapmdoc)</code>
2877 <code>--enable-leap-smear</code>
2884 .Sy DO NOT USE THIS OPTION ON PUBLIC-ACCESS SERVERS!
2901 ‘-’,
2909 ‘-’
2935 keyword to enable/disable all
2959 <code>-l</code>
3022 (frequency file) will be written, with a default value of 1e-7 (0.1 PPM).
3035 or the JJY driver (type 40, mode 100 - 180).
3039 For the JJY driver (type 40 mode 100 - 180), the argument is
3045 <dd><p>Enable skewing of our poll requests to our servers.
3053 The next two numbers must be between 0 and one-half of the poll interval,
3077 <code>-i</code>
3079 The default is 32 megabytes on non-Linux machines, and -1 under Linux.
3080 -1 means "do not lock the process into memory".
3081 0 means "lock whatever memory the process wants into memory".
3113 <code>config-from-file</code>
3130 <code>saveconfig\ ntp-%Y%m%d-%H%M%S.conf</code>.
3207 parts-per-million.
3213 huff-n’-puff filter span, which determines the most recent interval
3291 mode these values are used in-turn in an expanding-ring search.
3305 an expanding-ring search.
3312 using the <code>agtexi-cmd</code> template and the option descriptions for the <code>ntp.conf</code> program.
3316 <tr><td align="left" valign="top">• <a href="#ntp_002econf-Files" accesskey="1">ntp.conf Files</a></td><td> </td><td align="left" valign="top">Files
3318 <tr><td align="left" valign="top">• <a href="#ntp_002econf-See-Also" accesskey="2">ntp.conf See Also</a></td><td> </td><td align="left" valign="top">See Also
3320 <tr><td align="left" valign="top">• <a href="#ntp_002econf-Bugs" accesskey="3">ntp.conf Bugs</a></td><td> </td><td align="left" valign="top">Bugs
3322 <tr><td align="left" valign="top">• <a href="#ntp_002econf-Notes" accesskey="4">ntp.conf Notes</a></td><td> </td><td align="left" valign="top">Notes
3327 <span id="ntp_002econf-Files"></span><div class="header">
3329 Next: <a href="#ntp_002econf-See-Also" accesskey="n" rel="next">ntp.conf See Also</a>, Previous: <a href="#Miscellaneous-Options" accesskey="p" rel="prev">Miscellaneous Options</a>, Up: <a href="#ntp_002econf-Notes" accesskey="u" rel="up">ntp.conf Notes</a> </p>
3331 <span id="ntp_002econf-Files-1"></span><h4 class="subsection">1.1.8 ntp.conf Files</h4>
3346 <dd><p>Diffie-Hellman agreement parameters
3350 <span id="ntp_002econf-See-Also"></span><div class="header">
3352 Next: <a href="#ntp_002econf-Bugs" accesskey="n" rel="next">ntp.conf Bugs</a>, Previous: <a href="#ntp_002econf-Files" accesskey="p" rel="prev">ntp.conf Files</a>, Up: <a href="#ntp_002econf-Notes" accesskey="u" rel="up">ntp.conf Notes</a> </p>
3354 <span id="ntp_002econf-See-Also-1"></span><h4 class="subsection">1.1.9 ntp.conf See Also</h4>
3370 <span id="ntp_002econf-Bugs"></span><div class="header">
3372 Previous: <a href="#ntp_002econf-See-Also" accesskey="p" rel="prev">ntp.conf See Also</a>, Up: <a href="#ntp_002econf-Notes" accesskey="u" rel="up">ntp.conf Notes</a> </p>
3374 <span id="ntp_002econf-Bugs-1"></span><h4 class="subsection">1.1.10 ntp.conf Bugs</h4>
3390 <span id="ntp_002econf-Notes-1"></span><h4 class="subsection">1.1.11 ntp.conf Notes</h4>