Lines Matching +full:digital +full:- +full:input +full:- +full:threshold +full:- +full:mode +full:- +full:fixed

1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
3 <!-- Created by GNU Texinfo 6.6, http://www.gnu.org/software/texinfo/ -->
5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
10 <meta name="resource-type" content="document">
16 <!--
17 a.summary-letter {text-decoration: none}
18 blockquote.indentedblock {margin-right: 0em}
19 div.display {margin-left: 3.2em}
20 div.example {margin-left: 3.2em}
21 div.lisp {margin-left: 3.2em}
22 kbd {font-style: oblique}
23 pre.display {font-family: inherit}
24 pre.format {font-family: inherit}
25 pre.menu-comment {font-family: serif}
26 pre.menu-preformatted {font-family: serif}
27 span.nolinebreak {white-space: nowrap}
28 span.roman {font-family: initial; font-weight: normal}
29 span.sansserif {font-family: sans-serif; font-weight: normal}
30 ul.no-bullet {list-style: none}
31 -->
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> &nbsp; </p>
48 <span id="NTP_0027s-Configuration-File-User-Manual"></span><h1 class="top">NTP&rsquo;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">&bull; <a href="#ntp_002econf-Description" accesskey="1">ntp.conf Description</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
68 <tr><td align="left" valign="top">&bull; <a href="#ntp_002econf-Notes" accesskey="2">ntp.conf Notes</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
73 <span id="ntp_002econf-Description"></span><div class="header">
83 <tr><td align="left" valign="top">&bull; <a href="#ntp_002econf-Notes" accesskey="1">Notes about ntp.conf</a></td><td>&nbsp;&nbsp;</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> &nbsp; </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">&bull; <a href="#Configuration-Support" accesskey="1">Configuration Support</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
163 <tr><td align="left" valign="top">&bull; <a href="#Authentication-Support" accesskey="2">Authentication Support</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
165 <tr><td align="left" valign="top">&bull; <a href="#Monitoring-Support" accesskey="3">Monitoring Support</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
167 <tr><td align="left" valign="top">&bull; <a href="#Access-Control-Support" accesskey="4">Access Control Support</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
169 <tr><td align="left" valign="top">&bull; <a href="#Automatic-NTP-Configuration-Options" accesskey="5">Automatic NTP Configuration Options</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
171 <tr><td align="left" valign="top">&bull; <a href="#Reference-Clock-Support" accesskey="6">Reference Clock Support</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
173 <tr><td align="left" valign="top">&bull; <a href="#Miscellaneous-Options" accesskey="7">Miscellaneous Options</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
175 <tr><td align="left" valign="top">&bull; <a href="#ntp_002econf-Files" accesskey="8">ntp.conf Files</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
177 <tr><td align="left" valign="top">&bull; <a href="#ntp_002econf-See-Also" accesskey="9">ntp.conf See Also</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
179 <tr><td align="left" valign="top">&bull; <a href="#ntp_002econf-Bugs">ntp.conf Bugs</a></td><td>&nbsp;&nbsp;</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> &nbsp; </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>
250 be used and the mode in which to operate.
254 either a DNS name or an IP address in dotted-quad notation.
264 client mode association with a number of remote servers.
265 In this mode the local clock can synchronized to the
271 client mode association with the specified remote server or local
273 In this mode the local clock can synchronized to the
283 persistent symmetric-active mode association with the specified
285 In this mode the local clock can be synchronized to
296 command mobilizes a persistent broadcast mode association.
303 In broadcast mode the local server sends periodic broadcast
324 manycast client mode association for the multicast address
339 is to operate in client mode with the remote servers that are
381 <code>-q</code>
436 It specifies the time-to-live
450 Versions 1-4 are the choices, with version 4 the
458 modes only, this flag enables interleave mode.
469 <span id="Auxiliary-Commands"></span><h4 class="subsubsection">1.1.1.2 Auxiliary Commands</h4>
477 server, then enters the broadcast client mode, in which it
480 to avoid accidental or malicious disruption in this mode, both the
481 server and client should operate using symmetric-key or public-key
494 accidental or malicious disruption in this mode, both the server
495 and client should operate using symmetric-key or public-key
505 exchange with the server, then enters the broadcast client mode, in
508 in order to avoid accidental or malicious disruption in this mode,
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> &nbsp; </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
543 operating in Cipher Block Chaining (CBC) mode, commonly called
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
649 is manycast mode, in which clients periodically troll
651 <a href="#Automatic-NTP-Configuration-Options">Automatic NTP Configuration Options</a>
654 cryptographic authentication can be used in this mode.
656 of manycast mode is that potential servers need not be
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,
722 and verifies the source with digital signatures and any of several
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>
763 those based on RSA and DSA digital signatures.
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> &nbsp; </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.
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.
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.
1502 generation set by a fixed name.
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> &nbsp; </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 &quot;kiss-of-death&quot; (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&rsquo;-death packet returned if enabled.
1681 where a value of -1 means &quot;unlimited&quot;, 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&rsquo;-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> &nbsp; </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
1939 in burst mode in order to reliably set the host clock
1942 in a volley of eight client/server at 2-s intervals
1951 in ordinary client/server mode.
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>
2147 <p>Each time a manycast client sends a client mode packet
2162 This is in general transparent in client/server mode.
2176 </p><span id="Broadcast-Options"></span><h4 class="subsubsection">1.1.5.3 Broadcast Options</h4>
2188 broadcast mode, attempts to perform a replay attack are possible.
2193 <span id="Manycast-Options"></span><h4 class="subsubsection">1.1.5.4 Manycast Options</h4>
2200 and is most useful in manycast mode.
2259 In manycast mode these values are used in turn
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> &nbsp; </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 &quot;Pulse-per-second (PPS) Signal Interfacing&quot;
2340 number in the range 0-3.
2359 <code>mode</code>
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>
2427 <dt><code>server</code> <code>127.127.</code><kbd>t</kbd>.<kbd>u</kbd> <code>[<code>prefer</code>]</code> <code>[<code>mode</code> <kbd>int</kbd>]</code> <code>[<code>minpoll</code> <kbd>int</kbd>]</code> <code>[<code>maxpoll</code> <kbd>int</kbd>]</code></dt>
2445 <dt><code>mode</code> <kbd>int</kbd></dt>
2446 <dd><p>Specifies a mode number which is interpreted in a
2447 device-specific fashion.
2472 <dt><code>fudge</code> <code>127.127.</code><kbd>t</kbd>.<kbd>u</kbd> <code>[<code>time1</code> <kbd>sec</kbd>]</code> <code>[<code>time2</code> <kbd>sec</kbd>]</code> <code>[<code>stratum</code> <kbd>int</kbd>]</code> <code>[<code>refid</code> <kbd>string</kbd>]</code> <code>[<code>mode</code> <kbd>int</kbd>]</code> <code>[<code>flag1</code> <code>0</code> <code>|</code> <code>1</code>]</code> <code>[<code>flag2</code> <code>0</code> <code>|</code> <code>1</code>]</code> <code>[<code>flag3</code> <code>0</code> <code>|</code> <code>1</code>]</code> <code>[<code>flag4</code> <code>0</code> <code>|</code> <code>1</code>]</code></dt>
2487 the driver, a fixed-point decimal number in seconds.
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.
2539 <dt><code>mode</code> <kbd>int</kbd></dt>
2540 <dd><p>Specifies a mode number which is interpreted in a
2541 device-specific fashion.
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> &nbsp; </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.
2668 <dd><p>Enables processing of NTP mode 7 implementation-specific requests
2679 using standard mode 6 requests.
2705 receives a crypto-NAK packet that
2710 a properly forged and appropriately delivered crypto-NAK packet
2756 receives a crypto-NAK packet that
2761 a properly forged and appropriately delivered crypto-NAK packet
2813 opens, and whether input is dropped without processing.
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 &lsquo;-&rsquo;,
2909 &lsquo;-&rsquo;
2959 <code>-l</code>
3017 <dt><code>nonvolatile</code> <kbd>threshold</kbd></dt>
3019 <kbd>threshold</kbd>
3022 (frequency file) will be written, with a default value of 1e-7 (0.1 PPM).
3025 exceeds the threshold, the file is written and the
3026 <code>threshold</code>
3027 becomes the new threshold value.
3028 If the threshold is not exceeeded, it is reduced by half.
3035 or the JJY driver (type 40, mode 100 - 180).
3039 For the JJY driver (type 40 mode 100 - 180), the argument is
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 &quot;do not lock the process into memory&quot;.
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&rsquo;-puff filter span, which determines the most recent interval
3222 <dd><p>The argument is the panic threshold, normally 1000 s.
3228 <dd><p>The argument is the step threshold, which by default is 0.128 s.
3234 disabled if the step threshold is set to zero or greater than the
3238 <dd><p>The argument is the step threshold for the backward direction,
3246 each direction of step threshold are either
3291 mode these values are used in-turn in an expanding-ring search.
3304 In manycast mode these values are used in turn in
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">&bull; <a href="#ntp_002econf-Files" accesskey="1">ntp.conf Files</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Files
3318 <tr><td align="left" valign="top">&bull; <a href="#ntp_002econf-See-Also" accesskey="2">ntp.conf See Also</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">See Also
3320 <tr><td align="left" valign="top">&bull; <a href="#ntp_002econf-Bugs" accesskey="3">ntp.conf Bugs</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Bugs
3322 <tr><td align="left" valign="top">&bull; <a href="#ntp_002econf-Notes" accesskey="4">ntp.conf Notes</a></td><td>&nbsp;&nbsp;</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> &nbsp; </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> &nbsp; </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> &nbsp; </p>
3374 <span id="ntp_002econf-Bugs-1"></span><h4 class="subsection">1.1.10 ntp.conf Bugs</h4>
3381 files are really digital
3390 <span id="ntp_002econf-Notes-1"></span><h4 class="subsection">1.1.11 ntp.conf Notes</h4>