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span.sc { font-variant:small-caps } 1891706Sobrien span.roman { font-family: serif; font-weight: normal; } 1938653Sgpalmer--></style> 2038653Sgpalmer</head> 21202892Santoine<body> 22183242Ssam<h1 class="settitle">ntpd: Network Time Protocol (NTP) Daemon User's Manual</h1> 23124587Sru<div class="node"> 2457013Sobrien<p><hr> 25148771Scperciva<a name="Top"></a>Next: <a rel="next" accesskey="n" href="#ntpd-Description">ntpd Description</a>, 2678562SobrienPrevious: <a rel="previous" accesskey="p" href="#dir">(dir)</a>, 27108667SobrienUp: <a rel="up" accesskey="u" href="#dir">(dir)</a> 28119553Sphk<br> 29119553Sphk</div> 30148677Sphk 3138653Sgpalmer<h2 class="unnumbered">ntpd: Network Time Protocol (NTP) Daemon User Manual</h2> 32148741Sphk 3338653Sgpalmer<p>The <code>ntpd</code> program is an operating system daemon that synchronizes the 34183242Ssamsystem clock to remote NTP time servers or local reference clocks. 35124587SruIt is a complete implementation of NTP version 4 defined by RFC-5905, but 3638653Sgpalmeralso retains compatible with version 3 defined by RFC-1305 and versions 3738653Sgpalmer1 and 2, defined by RFC-1059 and RFC-1119, respectively. 3838653SgpalmerThe program can operate in any of several modes, including client/server, 3938653Sgpalmersymmetric and broadcast modes, and with both symmetric-key and public-key 40183242Ssamcryptography. 4138653Sgpalmer 4238653Sgpalmer <p>This document applies to version 4.2.8p8 of <code>ntpd</code>. 4338653Sgpalmer 4438653Sgpalmer<ul class="menu"> 45183242Ssam<li><a accesskey="1" href="#ntpd-Description">ntpd Description</a>: Description 4638653Sgpalmer<li><a accesskey="2" href="#ntpd-Invocation">ntpd Invocation</a>: Invoking ntpd 47179813Sdougb<li><a accesskey="3" href="#Usage">Usage</a>: Usage 48176733Sjeff</ul> 4995926Stjr 50156256Smux<div class="node"> 51183242Ssam<p><hr> 5238653Sgpalmer<a name="ntpd-Description"></a> 53202892Santoine<br> 54124587Sru</div> 5538653Sgpalmer 5638653Sgpalmer<!-- node-name, next, previous, up --> 5738653Sgpalmer<h3 class="section">Description</h3> 58108439Sobrien 59109314Sobrien<p>The <code>ntpd</code> program ordinarily requires 6040826Sjoerga configuration file described at <a href="#ntp_002econf">ntp.conf</a>. 6138653SgpalmerThis configuration file contains configuration commands described on 6238653Sgpalmerthe pages listed above. 6338653SgpalmerHowever a client can discover remote servers and configure them 6438653Sgpalmerautomatically. 6538653SgpalmerThis makes it possible to deploy a fleet of workstations without 66183242Ssamspecifying configuration details specific to the local environment. 6738653Sgpalmer 6838653Sgpalmer <p>The <code>ntpd</code> program normally operates continuously while adjusting the 69203711Sdelphijsystem time and frequency, but in some cases this might not be 7038653Sgpalmerpractical. 71183242SsamWith the <code>-q</code> option <code>ntpd</code> operates as in continuous mode, but 7241036Sdimaexits just after setting the clock for the first time. 7363499SpsMost applications will probably want to specify the <code>iburst</code> 7438653Sgpalmeroption with the <code>server</code> command. 75103303SpeterWith this option an initial volley of messages is exchanged to 7638653Sgpalmergroom the data and set the clock in about ten seconds' time. 77101629SjakeIf nothing is heard after a few minutes' time, 78158287Smaximthe daemon times out and exits without setting the clock. 7938653Sgpalmer 80111204Sobrien<div class="node"> 81166255Sdelphij<p><hr> 8238653Sgpalmer<a name="ntpd-Invocation"></a> 83148780Sphk<br> 8438653Sgpalmer</div> 85124587Sru 8638653Sgpalmer<h3 class="section">Invoking ntpd</h3> 87183242Ssam 8838653Sgpalmer<p><a name="index-ntpd-1"></a><a name="index-NTP-daemon-program-2"></a> 8938653Sgpalmer 9038653Sgpalmer <p>The 9138653Sgpalmer<code>ntpd</code> 9238653Sgpalmerutility is an operating system daemon which sets 9338653Sgpalmerand maintains the system time of day in synchronism with Internet 9438653Sgpalmerstandard time servers. 9538653SgpalmerIt is a complete implementation of the 9638653SgpalmerNetwork Time Protocol (NTP) version 4, as defined by RFC-5905, 9793619Sjakebut also retains compatibility with 9838653Sgpalmerversion 3, as defined by RFC-1305, and versions 1 9938653Sgpalmerand 2, as defined by RFC-1059 and RFC-1119, respectively. 10038653Sgpalmer 10139614Sbde <p>The 10238653Sgpalmer<code>ntpd</code> 10360789Spsutility does most computations in 64-bit floating point 10460789Spsarithmetic and does relatively clumsy 64-bit fixed point operations 10560789Spsonly when necessary to preserve the ultimate precision, about 232 106119553Sphkpicoseconds. 10738653SgpalmerWhile the ultimate precision is not achievable with 108116677Sphantomordinary workstations and networks of today, it may be required 109183242Ssamwith future gigahertz CPU clocks and gigabit LANs. 11038653Sgpalmer 11138653Sgpalmer <p>Ordinarily, 11238653Sgpalmer<code>ntpd</code> 11338653Sgpalmerreads the 114126701Sdes<code>ntp.conf(5)</code> 11538653Sgpalmerconfiguration file at startup time in order to determine the 11638653Sgpalmersynchronization sources and operating modes. 11738653SgpalmerIt is also possible to 11838653Sgpalmerspecify a working, although limited, configuration entirely on the 11938653Sgpalmercommand line, obviating the need for a configuration file. 120183242SsamThis may 121183242Ssambe particularly useful when the local host is to be configured as a 12296845Smarkmbroadcast/multicast client, with all peers being determined by 12338653Sgpalmerlistening to broadcasts at run time. 124174814Sru 125174810Sphk <p>If NetInfo support is built into 12638653Sgpalmer<code>ntpd</code> 12738653Sgpalmerthen 12838653Sgpalmer<code>ntpd</code> 129183242Ssamwill attempt to read its configuration from the 13038653SgpalmerNetInfo if the default 131146107Sfjoe<code>ntp.conf(5)</code> 132183242Ssamfile cannot be read and no file is 13339914Sdfrspecified by the 134141800Sdelphij<code>-c</code> 13538653Sgpalmeroption. 136124587Sru 137124587Sru <p>Various internal 13838653Sgpalmer<code>ntpd</code> 13997365Stjrvariables can be displayed and 140124587Sruconfiguration options altered while the 14138653Sgpalmer<code>ntpd</code> 14238653Sgpalmeris running 14376273Sbrianusing the 14438653Sgpalmer<code>ntpq(1ntpqmdoc)</code> 145135549Sdesand 146135549Sdes<code>ntpdc(1ntpdcmdoc)</code> 14738653Sgpalmerutility programs. 14838653Sgpalmer 14938653Sgpalmer <p>When 15038653Sgpalmer<code>ntpd</code> 15138653Sgpalmerstarts it looks at the value of 15238653Sgpalmer<code>umask(2)</code>, 15397096Stjrand if zero 154192398Sgnn<code>ntpd</code> 15538653Sgpalmerwill set the 15638653Sgpalmer<code>umask(2)</code> 15738653Sgpalmerto 022. 158174200Srwatson 159183242Ssam <p>This section was generated by <strong>AutoGen</strong>, 16038653Sgpalmerusing the <code>agtexi-cmd</code> template and the option descriptions for the <code>ntpd</code> program. 16138653SgpalmerThis software is released under the NTP license, <http://ntp.org/license>;. 162194267Sed 163143026Strhodes<ul class="menu"> 164183242Ssam<li><a accesskey="1" href="#ntpd-usage">ntpd usage</a>: ntpd help/usage (<span class="option">--help</span>) 16538653Sgpalmer<li><a accesskey="2" href="#ntpd-ipv4">ntpd ipv4</a>: ipv4 option (-4) 16638653Sgpalmer<li><a accesskey="3" href="#ntpd-ipv6">ntpd ipv6</a>: ipv6 option (-6) 167143026Strhodes<li><a accesskey="4" href="#ntpd-authreq">ntpd authreq</a>: authreq option (-a) 16838653Sgpalmer<li><a accesskey="5" href="#ntpd-authnoreq">ntpd authnoreq</a>: authnoreq option (-A) 169183242Ssam<li><a accesskey="6" href="#ntpd-configfile">ntpd configfile</a>: configfile option (-c) 17038653Sgpalmer<li><a accesskey="7" href="#ntpd-driftfile">ntpd driftfile</a>: driftfile option (-f) 17138653Sgpalmer<li><a accesskey="8" href="#ntpd-panicgate">ntpd panicgate</a>: panicgate option (-g) 172183242Ssam<li><a accesskey="9" href="#ntpd-force_002dstep_002donce">ntpd force-step-once</a>: force-step-once option (-G) 17338653Sgpalmer<li><a href="#ntpd-jaildir">ntpd jaildir</a>: jaildir option (-i) 17438653Sgpalmer<li><a href="#ntpd-interface">ntpd interface</a>: interface option (-I) 17538653Sgpalmer<li><a href="#ntpd-keyfile">ntpd keyfile</a>: keyfile option (-k) 17638653Sgpalmer<li><a href="#ntpd-logfile">ntpd logfile</a>: logfile option (-l) 177124587Sru<li><a href="#ntpd-novirtualips">ntpd novirtualips</a>: novirtualips option (-L) 17845701Sdes<li><a href="#ntpd-modifymmtimer">ntpd modifymmtimer</a>: modifymmtimer option (-M) 17938653Sgpalmer<li><a href="#ntpd-nice">ntpd nice</a>: nice option (-N) 18097955Sdougb<li><a href="#ntpd-pidfile">ntpd pidfile</a>: pidfile option (-p) 18138653Sgpalmer<li><a href="#ntpd-priority">ntpd priority</a>: priority option (-P) 18241035Sdima<li><a href="#ntpd-quit">ntpd quit</a>: quit option (-q) 18397034Stjr<li><a href="#ntpd-propagationdelay">ntpd propagationdelay</a>: propagationdelay option (-r) 18438653Sgpalmer<li><a href="#ntpd-saveconfigquit">ntpd saveconfigquit</a>: saveconfigquit option 18538653Sgpalmer<li><a href="#ntpd-statsdir">ntpd statsdir</a>: statsdir option (-s) 186127947Skientzle<li><a href="#ntpd-trustedkey">ntpd trustedkey</a>: trustedkey option (-t) 18738653Sgpalmer<li><a href="#ntpd-user">ntpd user</a>: user option (-u) 18838653Sgpalmer<li><a href="#ntpd-updateinterval">ntpd updateinterval</a>: updateinterval option (-U) 189183242Ssam<li><a href="#ntpd-wait_002dsync">ntpd wait-sync</a>: wait-sync option (-w) 19038653Sgpalmer<li><a href="#ntpd-slew">ntpd slew</a>: slew option (-x) 19138653Sgpalmer<li><a href="#ntpd-usepcc">ntpd usepcc</a>: usepcc option 19288277Smarkm<li><a href="#ntpd-pccfreq">ntpd pccfreq</a>: pccfreq option 19338653Sgpalmer<li><a href="#ntpd-mdns">ntpd mdns</a>: mdns option (-m) 19438653Sgpalmer<li><a href="#ntpd-config">ntpd config</a>: presetting/configuring ntpd 19538653Sgpalmer<li><a href="#ntpd-exit-status">ntpd exit status</a>: exit status 19638653Sgpalmer<li><a href="#ntpd-Usage">ntpd Usage</a>: Usage 19738653Sgpalmer<li><a href="#ntpd-Files">ntpd Files</a>: Files 19863437Ssheldonh<li><a href="#ntpd-See-Also">ntpd See Also</a>: See Also 199111204Sobrien<li><a href="#ntpd-Bugs">ntpd Bugs</a>: Bugs 20038653Sgpalmer<li><a href="#ntpd-Notes">ntpd Notes</a>: Notes 20138653Sgpalmer</ul> 20238653Sgpalmer 203183242Ssam<div class="node"> 20438653Sgpalmer<p><hr> 20538653Sgpalmer<a name="ntpd-usage"></a>Next: <a rel="next" accesskey="n" href="#ntpd-ipv4">ntpd ipv4</a>, 206183242SsamUp: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 20738653Sgpalmer<br> 208200068Srdivacky</div> 20938653Sgpalmer 21038653Sgpalmer<h4 class="subsection">ntpd help/usage (<span class="option">--help</span>)</h4> 211124587Sru 212124587Sru<p><a name="index-ntpd-help-3"></a> 21338653SgpalmerThis is the automatically generated usage text for ntpd. 21438653Sgpalmer 21538653Sgpalmer <p>The text printed is the same whether selected with the <code>help</code> option 216124587Sru(<span class="option">--help</span>) or the <code>more-help</code> option (<span class="option">--more-help</span>). <code>more-help</code> will print 217183242Ssamthe usage text by passing it through a pager program. 21838653Sgpalmer<code>more-help</code> is disabled on platforms without a working 21938653Sgpalmer<code>fork(2)</code> function. The <code>PAGER</code> environment variable is 22041062Sbdeused to select the program, defaulting to <span class="file">more</span>. Both will exit 22138653Sgpalmerwith a status code of 0. 22238653Sgpalmer 22338653Sgpalmer<pre class="example">ntpd - NTP daemon program - Ver. 4.2.8p7 22438653SgpalmerUsage: ntpd [ -<flag> [<val>] | --<name>[{=| }<val>] ]... \ 22599379Sjohan [ <server1> ... <serverN> ] 22638653Sgpalmer Flg Arg Option-Name Description 22738653Sgpalmer -4 no ipv4 Force IPv4 DNS name resolution 22838653Sgpalmer - prohibits the option 'ipv6' 22938653Sgpalmer -6 no ipv6 Force IPv6 DNS name resolution 230202301Sed - prohibits the option 'ipv4' 23138653Sgpalmer -a no authreq Require crypto authentication 23238653Sgpalmer - prohibits the option 'authnoreq' 233106717Smarcel -A no authnoreq Do not require crypto authentication 234183242Ssam - prohibits the option 'authreq' 235119553Sphk -b no bcastsync Allow us to sync to broadcast servers 23638653Sgpalmer -c Str configfile configuration file name 237137675Sbz -d no debug-level Increase debug verbosity level 238137675Sbz - may appear multiple times 239137675Sbz -D Num set-debug-level Set the debug verbosity level 2401590Srgrimes - may appear multiple times 241188629Simp -f Str driftfile frequency drift file name 242124587Sru -g no panicgate Allow the first adjustment to be Big 243124587Sru - may appear multiple times 244124587Sru -G no force-step-once Step any initial offset correction. 245183242Ssam -i Str jaildir Jail directory 246183242Ssam -I Str interface Listen on an interface name or address 247183242Ssam - may appear multiple times 248183242Ssam -k Str keyfile path to symmetric keys 249183242Ssam -l Str logfile path to the log file 250183242Ssam -L no novirtualips Do not listen to virtual interfaces 251156813Sru -n no nofork Do not fork 252136140Sru - prohibits the option 'wait-sync' 253124587Sru -N no nice Run at high priority 254124587Sru -p Str pidfile path to the PID file 255156813Sru -P Num priority Process priority 256148741Sphk -q no quit Set the time and quit 257148741Sphk - prohibits these options: 258148741Sphk saveconfigquit 259156813Sru wait-sync 260124587Sru -r Str propagationdelay Broadcast/propagation delay 261124587Sru Str saveconfigquit Save parsed configuration and quit 262135549Sdes - prohibits these options: 263135549Sdes quit 26453909Speter wait-sync 26553909Speter -s Str statsdir Statistics file location 266156813Sru -t Str trustedkey Trusted key number 267131768Semax - may appear multiple times 268131768Semax -u Str user Run as userid (or userid:groupid) 269131768Semax -U Num updateinterval interval in seconds between scans for new or dropped interfaces 270179813Sdougb Str var make ARG an ntp variable (RW) 271179813Sdougb - may appear multiple times 272179813Sdougb Str dvar make ARG an ntp variable (RW|DEF) 273179813Sdougb - may appear multiple times 274156813Sru -w Num wait-sync Seconds to wait for first clock sync 275148677Sphk - prohibits these options: 276148677Sphk nofork 277148677Sphk quit 278183242Ssam saveconfigquit 279183242Ssam -x no slew Slew up to 600 seconds 280183242Ssam opt version output version information and exit 281183242Ssam -? no help display extended usage information and exit 282156813Sru -! no more-help extended usage information passed thru pager 283202892Santoine 284124587SruOptions are specified by doubled hyphens and their name or by a single 285202892Santoinehyphen and the flag character. 286124587Sru 287177714Sru 288156256SmuxThe following option preset mechanisms are supported: 289124587Sru - examining environment variables named NTPD_* 290156944Sru 291124587SruPlease send bug reports to: <http://bugs.ntp.org, bugs@ntp.org> 292183242Ssam</pre> 293183242Ssam <div class="node"> 294148780Sphk<p><hr> 295148780Sphk<a name="ntpd-ipv4"></a>Next: <a rel="next" accesskey="n" href="#ntpd-ipv6">ntpd ipv6</a>, 296183242SsamPrevious: <a rel="previous" accesskey="p" href="#ntpd-usage">ntpd usage</a>, 297183242SsamUp: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 298183242Ssam<br> 299183242Ssam</div> 300183242Ssam 301183242Ssam<h4 class="subsection">ipv4 option (-4)</h4> 302183242Ssam 303183242Ssam<p><a name="index-ntpd_002dipv4-4"></a> 304183242SsamThis is the “force ipv4 dns name resolution” option. 305183242Ssam 306183242Ssam<p class="noindent">This option has some usage constraints. It: 307183242Ssam <ul> 308156813Sru<li>must not appear in combination with any of the following options: 309141789Sdelphijipv6. 310141785Sdelphij</ul> 311141785Sdelphij 312156813Sru <p>Force DNS resolution of following host names on the command line 313137675Sbzto the IPv4 namespace. 314137675Sbz<div class="node"> 315137675Sbz<p><hr> 316137675Sbz<a name="ntpd-ipv6"></a>Next: <a rel="next" accesskey="n" href="#ntpd-authreq">ntpd authreq</a>, 317137675SbzPrevious: <a rel="previous" accesskey="p" href="#ntpd-ipv4">ntpd ipv4</a>, 318183242SsamUp: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 319183242Ssam<br> 320183242Ssam</div> 321183242Ssam 322156813Sru<h4 class="subsection">ipv6 option (-6)</h4> 323143026Strhodes 324143026Strhodes<p><a name="index-ntpd_002dipv6-5"></a> 325183242SsamThis is the “force ipv6 dns name resolution” option. 326183242Ssam 327143026Strhodes<p class="noindent">This option has some usage constraints. It: 328143026Strhodes <ul> 329156813Sru<li>must not appear in combination with any of the following options: 330124587Sruipv4. 33186252Sgshapiro</ul> 33286252Sgshapiro 333183242Ssam <p>Force DNS resolution of following host names on the command line 334183242Ssamto the IPv6 namespace. 335183242Ssam<div class="node"> 336183242Ssam<p><hr> 337183242Ssam<a name="ntpd-authreq"></a>Next: <a rel="next" accesskey="n" href="#ntpd-authnoreq">ntpd authnoreq</a>, 338183242SsamPrevious: <a rel="previous" accesskey="p" href="#ntpd-ipv6">ntpd ipv6</a>, 339183242SsamUp: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 340183242Ssam<br> 341183242Ssam</div> 342183242Ssam 343156813Sru<h4 class="subsection">authreq option (-a)</h4> 344183333Smarius 345124587Sru<p><a name="index-ntpd_002dauthreq-6"></a> 346124587SruThis is the “require crypto authentication” option. 347183242Ssam 348183242Ssam<p class="noindent">This option has some usage constraints. It: 349183242Ssam <ul> 350124587Sru<li>must not appear in combination with any of the following options: 351183242Ssamauthnoreq. 352124587Sru</ul> 353183242Ssam 354183242Ssam <p>Require cryptographic authentication for broadcast client, 355183242Ssammulticast client and symmetric passive associations. 356124587SruThis is the default. 357183242Ssam<div class="node"> 358183242Ssam<p><hr> 359183242Ssam<a name="ntpd-authnoreq"></a>Next: <a rel="next" accesskey="n" href="#ntpd-configfile">ntpd configfile</a>, 360124587SruPrevious: <a rel="previous" accesskey="p" href="#ntpd-authreq">ntpd authreq</a>, 361124587SruUp: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 362124587Sru<br> 363156813Sru</div> 364124587Sru 365124587Sru<h4 class="subsection">authnoreq option (-A)</h4> 366119553Sphk 367119553Sphk<p><a name="index-ntpd_002dauthnoreq-7"></a> 36834554SjbThis is the “do not require crypto authentication” option. 369156905Sru 370124587Sru<p class="noindent">This option has some usage constraints. It: 371124587Sru <ul> 372156905Sru<li>must not appear in combination with any of the following options: 373124587Sruauthreq. 37436064Sjb</ul> 37534554Sjb 376161524Smarcel <p>Do not require cryptographic authentication for broadcast client, 377161524Smarcelmulticast client and symmetric passive associations. 378161524SmarcelThis is almost never a good idea. 379161524Smarcel<div class="node"> 380117952Speter<p><hr> 381156905Sru<a name="ntpd-configfile"></a>Next: <a rel="next" accesskey="n" href="#ntpd-driftfile">ntpd driftfile</a>, 382124587SruPrevious: <a rel="previous" accesskey="p" href="#ntpd-authnoreq">ntpd authnoreq</a>, 383124587SruUp: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 384156905Sru<br> 385124587Sru</div> 386117952Speter 387117952Speter<h4 class="subsection">configfile option (-c)</h4> 388150314Simura 389150314Simura<p><a name="index-ntpd_002dconfigfile-8"></a> 390150314SimuraThis is the “configuration file name” option. 391150314SimuraThis option takes a string argument. 392202982SyongariThe name and path of the configuration file, 393202982Syongari<span class="file">/etc/ntp.conf</span> 394202982Syongariby default. 395202982Syongari<div class="node"> 3961590Srgrimes<p><hr> 397<a name="ntpd-driftfile"></a>Next: <a rel="next" accesskey="n" href="#ntpd-panicgate">ntpd panicgate</a>, 398Previous: <a rel="previous" accesskey="p" href="#ntpd-configfile">ntpd configfile</a>, 399Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 400<br> 401</div> 402 403<h4 class="subsection">driftfile option (-f)</h4> 404 405<p><a name="index-ntpd_002ddriftfile-9"></a> 406This is the “frequency drift file name” option. 407This option takes a string argument. 408The name and path of the frequency file, 409<span class="file">/etc/ntp.drift</span> 410by default. 411This is the same operation as the 412<code>driftfile</code> <kbd>driftfile</kbd> 413configuration specification in the 414<span class="file">/etc/ntp.conf</span> 415file. 416<div class="node"> 417<p><hr> 418<a name="ntpd-panicgate"></a>Next: <a rel="next" accesskey="n" href="#ntpd-force_002dstep_002donce">ntpd force-step-once</a>, 419Previous: <a rel="previous" accesskey="p" href="#ntpd-driftfile">ntpd driftfile</a>, 420Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 421<br> 422</div> 423 424<h4 class="subsection">panicgate option (-g)</h4> 425 426<p><a name="index-ntpd_002dpanicgate-10"></a> 427This is the “allow the first adjustment to be big” option. 428 429<p class="noindent">This option has some usage constraints. It: 430 <ul> 431<li>may appear an unlimited number of times. 432</ul> 433 434 <p>Normally, 435<code>ntpd</code> 436exits with a message to the system log if the offset exceeds the panic threshold, which is 1000 s by default. This option allows the time to be set to any value without restriction; however, this can happen only once. If the threshold is exceeded after that, 437<code>ntpd</code> 438will exit with a message to the system log. This option can be used with the 439<code>-q</code> 440and 441<code>-x</code> 442options. 443See the 444<code>tinker</code> 445configuration file directive for other options. 446<div class="node"> 447<p><hr> 448<a name="ntpd-force_002dstep_002donce"></a>Next: <a rel="next" accesskey="n" href="#ntpd-jaildir">ntpd jaildir</a>, 449Previous: <a rel="previous" accesskey="p" href="#ntpd-panicgate">ntpd panicgate</a>, 450Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 451<br> 452</div> 453 454<h4 class="subsection">force-step-once option (-G)</h4> 455 456<p><a name="index-ntpd_002dforce_002dstep_002donce-11"></a> 457This is the “step any initial offset correction.” option. 458Normally, 459<code>ntpd</code> 460steps the time if the time offset exceeds the step threshold, 461which is 128 ms by default, and otherwise slews the time. 462This option forces the initial offset correction to be stepped, 463so the highest time accuracy can be achieved quickly. 464However, this may also cause the time to be stepped back 465so this option must not be used if 466applications requiring monotonic time are running. 467See the <code>tinker</code> configuration file directive for other options. 468<div class="node"> 469<p><hr> 470<a name="ntpd-jaildir"></a>Next: <a rel="next" accesskey="n" href="#ntpd-interface">ntpd interface</a>, 471Previous: <a rel="previous" accesskey="p" href="#ntpd-force_002dstep_002donce">ntpd force-step-once</a>, 472Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 473<br> 474</div> 475 476<h4 class="subsection">jaildir option (-i)</h4> 477 478<p><a name="index-ntpd_002djaildir-12"></a> 479This is the “jail directory” option. 480This option takes a string argument. 481 482<p class="noindent">This option has some usage constraints. It: 483 <ul> 484<li>must be compiled in by defining <code>HAVE_DROPROOT</code> during the compilation. 485</ul> 486 487 <p>Chroot the server to the directory 488<kbd>jaildir</kbd> 489. 490This option also implies that the server attempts to drop root privileges at startup. 491You may need to also specify a 492<code>-u</code> 493option. 494This option is only available if the OS supports adjusting the clock 495without full root privileges. 496This option is supported under NetBSD (configure with 497<code>--enable-clockctl</code>) or Linux (configure with 498<code>--enable-linuxcaps</code>) or Solaris (configure with <code>--enable-solarisprivs</code>). 499<div class="node"> 500<p><hr> 501<a name="ntpd-interface"></a>Next: <a rel="next" accesskey="n" href="#ntpd-keyfile">ntpd keyfile</a>, 502Previous: <a rel="previous" accesskey="p" href="#ntpd-jaildir">ntpd jaildir</a>, 503Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 504<br> 505</div> 506 507<h4 class="subsection">interface option (-I)</h4> 508 509<p><a name="index-ntpd_002dinterface-13"></a> 510This is the “listen on an interface name or address” option. 511This option takes a string argument <span class="file">iface</span>. 512 513<p class="noindent">This option has some usage constraints. It: 514 <ul> 515<li>may appear an unlimited number of times. 516</ul> 517 518 <p>Open the network address given, or all the addresses associated with the 519given interface name. This option may appear multiple times. This option 520also implies not opening other addresses, except wildcard and localhost. 521This option is deprecated. Please consider using the configuration file 522<code>interface</code> command, which is more versatile. 523<div class="node"> 524<p><hr> 525<a name="ntpd-keyfile"></a>Next: <a rel="next" accesskey="n" href="#ntpd-logfile">ntpd logfile</a>, 526Previous: <a rel="previous" accesskey="p" href="#ntpd-interface">ntpd interface</a>, 527Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 528<br> 529</div> 530 531<h4 class="subsection">keyfile option (-k)</h4> 532 533<p><a name="index-ntpd_002dkeyfile-14"></a> 534This is the “path to symmetric keys” option. 535This option takes a string argument. 536Specify the name and path of the symmetric key file. 537<span class="file">/etc/ntp.keys</span> 538is the default. 539This is the same operation as the 540<code>keys</code> <kbd>keyfile</kbd> 541configuration file directive. 542<div class="node"> 543<p><hr> 544<a name="ntpd-logfile"></a>Next: <a rel="next" accesskey="n" href="#ntpd-novirtualips">ntpd novirtualips</a>, 545Previous: <a rel="previous" accesskey="p" href="#ntpd-keyfile">ntpd keyfile</a>, 546Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 547<br> 548</div> 549 550<h4 class="subsection">logfile option (-l)</h4> 551 552<p><a name="index-ntpd_002dlogfile-15"></a> 553This is the “path to the log file” option. 554This option takes a string argument. 555Specify the name and path of the log file. 556The default is the system log file. 557This is the same operation as the 558<code>logfile</code> <kbd>logfile</kbd> 559configuration file directive. 560<div class="node"> 561<p><hr> 562<a name="ntpd-novirtualips"></a>Next: <a rel="next" accesskey="n" href="#ntpd-modifymmtimer">ntpd modifymmtimer</a>, 563Previous: <a rel="previous" accesskey="p" href="#ntpd-logfile">ntpd logfile</a>, 564Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 565<br> 566</div> 567 568<h4 class="subsection">novirtualips option (-L)</h4> 569 570<p><a name="index-ntpd_002dnovirtualips-16"></a> 571This is the “do not listen to virtual interfaces” option. 572Do not listen to virtual interfaces, defined as those with 573names containing a colon. This option is deprecated. Please 574consider using the configuration file <code>interface</code> command, which 575is more versatile. 576<div class="node"> 577<p><hr> 578<a name="ntpd-modifymmtimer"></a>Next: <a rel="next" accesskey="n" href="#ntpd-nice">ntpd nice</a>, 579Previous: <a rel="previous" accesskey="p" href="#ntpd-novirtualips">ntpd novirtualips</a>, 580Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 581<br> 582</div> 583 584<h4 class="subsection">modifymmtimer option (-M)</h4> 585 586<p><a name="index-ntpd_002dmodifymmtimer-17"></a> 587This is the “modify multimedia timer (windows only)” option. 588 589<p class="noindent">This option has some usage constraints. It: 590 <ul> 591<li>must be compiled in by defining <code>SYS_WINNT</code> during the compilation. 592</ul> 593 594 <p>Set the Windows Multimedia Timer to highest resolution. This 595ensures the resolution does not change while ntpd is running, 596avoiding timekeeping glitches associated with changes. 597<div class="node"> 598<p><hr> 599<a name="ntpd-nice"></a>Next: <a rel="next" accesskey="n" href="#ntpd-pidfile">ntpd pidfile</a>, 600Previous: <a rel="previous" accesskey="p" href="#ntpd-modifymmtimer">ntpd modifymmtimer</a>, 601Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 602<br> 603</div> 604 605<h4 class="subsection">nice option (-N)</h4> 606 607<p><a name="index-ntpd_002dnice-18"></a> 608This is the “run at high priority” option. 609To the extent permitted by the operating system, run 610<code>ntpd</code> 611at the highest priority. 612<div class="node"> 613<p><hr> 614<a name="ntpd-pidfile"></a>Next: <a rel="next" accesskey="n" href="#ntpd-priority">ntpd priority</a>, 615Previous: <a rel="previous" accesskey="p" href="#ntpd-nice">ntpd nice</a>, 616Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 617<br> 618</div> 619 620<h4 class="subsection">pidfile option (-p)</h4> 621 622<p><a name="index-ntpd_002dpidfile-19"></a> 623This is the “path to the pid file” option. 624This option takes a string argument. 625Specify the name and path of the file used to record 626<code>ntpd</code>'s 627process ID. 628This is the same operation as the 629<code>pidfile</code> <kbd>pidfile</kbd> 630configuration file directive. 631<div class="node"> 632<p><hr> 633<a name="ntpd-priority"></a>Next: <a rel="next" accesskey="n" href="#ntpd-quit">ntpd quit</a>, 634Previous: <a rel="previous" accesskey="p" href="#ntpd-pidfile">ntpd pidfile</a>, 635Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 636<br> 637</div> 638 639<h4 class="subsection">priority option (-P)</h4> 640 641<p><a name="index-ntpd_002dpriority-20"></a> 642This is the “process priority” option. 643This option takes a number argument. 644To the extent permitted by the operating system, run 645<code>ntpd</code> 646at the specified 647<code>sched_setscheduler(SCHED_FIFO)</code> 648priority. 649<div class="node"> 650<p><hr> 651<a name="ntpd-quit"></a>Next: <a rel="next" accesskey="n" href="#ntpd-propagationdelay">ntpd propagationdelay</a>, 652Previous: <a rel="previous" accesskey="p" href="#ntpd-priority">ntpd priority</a>, 653Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 654<br> 655</div> 656 657<h4 class="subsection">quit option (-q)</h4> 658 659<p><a name="index-ntpd_002dquit-21"></a> 660This is the “set the time and quit” option. 661 662<p class="noindent">This option has some usage constraints. It: 663 <ul> 664<li>must not appear in combination with any of the following options: 665saveconfigquit, wait-sync. 666</ul> 667 668 <p><code>ntpd</code> 669will not daemonize and will exit after the clock is first 670synchronized. This behavior mimics that of the 671<code>ntpdate</code> 672program, which will soon be replaced with a shell script. 673The 674<code>-g</code> 675and 676<code>-x</code> 677options can be used with this option. 678Note: The kernel time discipline is disabled with this option. 679<div class="node"> 680<p><hr> 681<a name="ntpd-propagationdelay"></a>Next: <a rel="next" accesskey="n" href="#ntpd-saveconfigquit">ntpd saveconfigquit</a>, 682Previous: <a rel="previous" accesskey="p" href="#ntpd-quit">ntpd quit</a>, 683Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 684<br> 685</div> 686 687<h4 class="subsection">propagationdelay option (-r)</h4> 688 689<p><a name="index-ntpd_002dpropagationdelay-22"></a> 690This is the “broadcast/propagation delay” option. 691This option takes a string argument. 692Specify the default propagation delay from the broadcast/multicast server to this client. This is necessary only if the delay cannot be computed automatically by the protocol. 693<div class="node"> 694<p><hr> 695<a name="ntpd-saveconfigquit"></a>Next: <a rel="next" accesskey="n" href="#ntpd-statsdir">ntpd statsdir</a>, 696Previous: <a rel="previous" accesskey="p" href="#ntpd-propagationdelay">ntpd propagationdelay</a>, 697Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 698<br> 699</div> 700 701<h4 class="subsection">saveconfigquit option</h4> 702 703<p><a name="index-ntpd_002dsaveconfigquit-23"></a> 704This is the “save parsed configuration and quit” option. 705This option takes a string argument. 706 707<p class="noindent">This option has some usage constraints. It: 708 <ul> 709<li>must be compiled in by defining <code>SAVECONFIG</code> during the compilation. 710<li>must not appear in combination with any of the following options: 711quit, wait-sync. 712</ul> 713 714 <p>Cause <code>ntpd</code> to parse its startup configuration file and save an 715equivalent to the given filename and exit. This option was 716designed for automated testing. 717<div class="node"> 718<p><hr> 719<a name="ntpd-statsdir"></a>Next: <a rel="next" accesskey="n" href="#ntpd-trustedkey">ntpd trustedkey</a>, 720Previous: <a rel="previous" accesskey="p" href="#ntpd-saveconfigquit">ntpd saveconfigquit</a>, 721Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 722<br> 723</div> 724 725<h4 class="subsection">statsdir option (-s)</h4> 726 727<p><a name="index-ntpd_002dstatsdir-24"></a> 728This is the “statistics file location” option. 729This option takes a string argument. 730Specify the directory path for files created by the statistics facility. 731This is the same operation as the 732<code>statsdir</code> <kbd>statsdir</kbd> 733configuration file directive. 734<div class="node"> 735<p><hr> 736<a name="ntpd-trustedkey"></a>Next: <a rel="next" accesskey="n" href="#ntpd-user">ntpd user</a>, 737Previous: <a rel="previous" accesskey="p" href="#ntpd-statsdir">ntpd statsdir</a>, 738Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 739<br> 740</div> 741 742<h4 class="subsection">trustedkey option (-t)</h4> 743 744<p><a name="index-ntpd_002dtrustedkey-25"></a> 745This is the “trusted key number” option. 746This option takes a string argument <span class="file">tkey</span>. 747 748<p class="noindent">This option has some usage constraints. It: 749 <ul> 750<li>may appear an unlimited number of times. 751</ul> 752 753 <p>Add the specified key number to the trusted key list. 754<div class="node"> 755<p><hr> 756<a name="ntpd-user"></a>Next: <a rel="next" accesskey="n" href="#ntpd-updateinterval">ntpd updateinterval</a>, 757Previous: <a rel="previous" accesskey="p" href="#ntpd-trustedkey">ntpd trustedkey</a>, 758Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 759<br> 760</div> 761 762<h4 class="subsection">user option (-u)</h4> 763 764<p><a name="index-ntpd_002duser-26"></a> 765This is the “run as userid (or userid:groupid)” option. 766This option takes a string argument. 767 768<p class="noindent">This option has some usage constraints. It: 769 <ul> 770<li>must be compiled in by defining <code>HAVE_DROPROOT</code> during the compilation. 771</ul> 772 773 <p>Specify a user, and optionally a group, to switch to. 774This option is only available if the OS supports adjusting the clock 775without full root privileges. 776This option is supported under NetBSD (configure with 777<code>--enable-clockctl</code>) or Linux (configure with 778<code>--enable-linuxcaps</code>) or Solaris (configure with <code>--enable-solarisprivs</code>). 779<div class="node"> 780<p><hr> 781<a name="ntpd-updateinterval"></a>Next: <a rel="next" accesskey="n" href="#ntpd-wait_002dsync">ntpd wait-sync</a>, 782Previous: <a rel="previous" accesskey="p" href="#ntpd-user">ntpd user</a>, 783Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 784<br> 785</div> 786 787<h4 class="subsection">updateinterval option (-U)</h4> 788 789<p><a name="index-ntpd_002dupdateinterval-27"></a> 790This is the “interval in seconds between scans for new or dropped interfaces” option. 791This option takes a number argument. 792Give the time in seconds between two scans for new or dropped interfaces. 793For systems with routing socket support the scans will be performed shortly after the interface change 794has been detected by the system. 795Use 0 to disable scanning. 60 seconds is the minimum time between scans. 796<div class="node"> 797<p><hr> 798<a name="ntpd-wait_002dsync"></a>Next: <a rel="next" accesskey="n" href="#ntpd-slew">ntpd slew</a>, 799Previous: <a rel="previous" accesskey="p" href="#ntpd-updateinterval">ntpd updateinterval</a>, 800Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 801<br> 802</div> 803 804<h4 class="subsection">wait-sync option (-w)</h4> 805 806<p><a name="index-ntpd_002dwait_002dsync-28"></a> 807This is the “seconds to wait for first clock sync” option. 808This option takes a number argument. 809 810<p class="noindent">This option has some usage constraints. It: 811 <ul> 812<li>must be compiled in by defining <code>HAVE_WORKING_FORK</code> during the compilation. 813<li>must not appear in combination with any of the following options: 814nofork, quit, saveconfigquit. 815</ul> 816 817 <p>If greater than zero, alters <code>ntpd</code>'s behavior when forking to 818daemonize. Instead of exiting with status 0 immediately after 819the fork, the parent waits up to the specified number of 820seconds for the child to first synchronize the clock. The exit 821status is zero (success) if the clock was synchronized, 822otherwise it is <code>ETIMEDOUT</code>. 823This provides the option for a script starting <code>ntpd</code> to easily 824wait for the first set of the clock before proceeding. 825<div class="node"> 826<p><hr> 827<a name="ntpd-slew"></a>Next: <a rel="next" accesskey="n" href="#ntpd-usepcc">ntpd usepcc</a>, 828Previous: <a rel="previous" accesskey="p" href="#ntpd-wait_002dsync">ntpd wait-sync</a>, 829Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 830<br> 831</div> 832 833<h4 class="subsection">slew option (-x)</h4> 834 835<p><a name="index-ntpd_002dslew-29"></a> 836This is the “slew up to 600 seconds” option. 837Normally, the time is slewed if the offset is less than the step threshold, which is 128 ms by default, and stepped if above the threshold. 838This option sets the threshold to 600 s, which is well within the accuracy window to set the clock manually. 839Note: Since the slew rate of typical Unix kernels is limited to 0.5 ms/s, each second of adjustment requires an amortization interval of 2000 s. 840Thus, an adjustment as much as 600 s will take almost 14 days to complete. 841This option can be used with the 842<code>-g</code> 843and 844<code>-q</code> 845options. 846See the 847<code>tinker</code> 848configuration file directive for other options. 849Note: The kernel time discipline is disabled with this option. 850<div class="node"> 851<p><hr> 852<a name="ntpd-usepcc"></a>Next: <a rel="next" accesskey="n" href="#ntpd-pccfreq">ntpd pccfreq</a>, 853Previous: <a rel="previous" accesskey="p" href="#ntpd-slew">ntpd slew</a>, 854Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 855<br> 856</div> 857 858<h4 class="subsection">usepcc option</h4> 859 860<p><a name="index-ntpd_002dusepcc-30"></a> 861This is the “use cpu cycle counter (windows only)” option. 862 863<p class="noindent">This option has some usage constraints. It: 864 <ul> 865<li>must be compiled in by defining <code>SYS_WINNT</code> during the compilation. 866</ul> 867 868 <p>Attempt to substitute the CPU counter for <code>QueryPerformanceCounter</code>. 869The CPU counter and <code>QueryPerformanceCounter</code> are compared, and if 870they have the same frequency, the CPU counter (RDTSC on x86) is 871used directly, saving the overhead of a system call. 872<div class="node"> 873<p><hr> 874<a name="ntpd-pccfreq"></a>Next: <a rel="next" accesskey="n" href="#ntpd-mdns">ntpd mdns</a>, 875Previous: <a rel="previous" accesskey="p" href="#ntpd-usepcc">ntpd usepcc</a>, 876Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 877<br> 878</div> 879 880<h4 class="subsection">pccfreq option</h4> 881 882<p><a name="index-ntpd_002dpccfreq-31"></a> 883This is the “force cpu cycle counter use (windows only)” option. 884This option takes a string argument. 885 886<p class="noindent">This option has some usage constraints. It: 887 <ul> 888<li>must be compiled in by defining <code>SYS_WINNT</code> during the compilation. 889</ul> 890 891 <p>Force substitution the CPU counter for <code>QueryPerformanceCounter</code>. 892The CPU counter (RDTSC on x86) is used unconditionally with the 893given frequency (in Hz). 894<div class="node"> 895<p><hr> 896<a name="ntpd-mdns"></a>Next: <a rel="next" accesskey="n" href="#ntpd-config">ntpd config</a>, 897Previous: <a rel="previous" accesskey="p" href="#ntpd-pccfreq">ntpd pccfreq</a>, 898Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 899<br> 900</div> 901 902<h4 class="subsection">mdns option (-m)</h4> 903 904<p><a name="index-ntpd_002dmdns-32"></a> 905This is the “register with mdns as a ntp server” option. 906 907<p class="noindent">This option has some usage constraints. It: 908 <ul> 909<li>must be compiled in by defining <code>HAVE_DNSREGISTRATION</code> during the compilation. 910</ul> 911 912 <p>Registers as an NTP server with the local mDNS server which allows 913the server to be discovered via mDNS client lookup. 914 915<div class="node"> 916<p><hr> 917<a name="ntpd-config"></a>Next: <a rel="next" accesskey="n" href="#ntpd-exit-status">ntpd exit status</a>, 918Previous: <a rel="previous" accesskey="p" href="#ntpd-mdns">ntpd mdns</a>, 919Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 920<br> 921</div> 922 923<h4 class="subsection">presetting/configuring ntpd</h4> 924 925<p>Any option that is not marked as <i>not presettable</i> may be preset by 926loading values from environment variables named <code>NTPD</code> and <code>NTPD_<OPTION_NAME></code>. <code><OPTION_NAME></code> must be one of 927the options listed above in upper case and segmented with underscores. 928The <code>NTPD</code> variable will be tokenized and parsed like 929the command line. The remaining variables are tested for existence and their 930values are treated like option arguments. 931 932 <p>The command line options relating to configuration and/or usage help are: 933 934<h5 class="subsubheading">version (-)</h5> 935 936<p>Print the program version to standard out, optionally with licensing 937information, then exit 0. The optional argument specifies how much licensing 938detail to provide. The default is to print just the version. The licensing infomation may be selected with an option argument. 939Only the first letter of the argument is examined: 940 941 <dl> 942<dt><span class="samp">version</span><dd>Only print the version. This is the default. 943<br><dt><span class="samp">copyright</span><dd>Name the copyright usage licensing terms. 944<br><dt><span class="samp">verbose</span><dd>Print the full copyright usage licensing terms. 945</dl> 946 947<div class="node"> 948<p><hr> 949<a name="ntpd-exit-status"></a>Next: <a rel="next" accesskey="n" href="#ntpd-Usage">ntpd Usage</a>, 950Previous: <a rel="previous" accesskey="p" href="#ntpd-config">ntpd config</a>, 951Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 952<br> 953</div> 954 955<h4 class="subsection">ntpd exit status</h4> 956 957<p>One of the following exit values will be returned: 958 <dl> 959<dt><span class="samp">0 (EXIT_SUCCESS)</span><dd>Successful program execution. 960<br><dt><span class="samp">1 (EXIT_FAILURE)</span><dd>The operation failed or the command syntax was not valid. 961</dl> 962 <div class="node"> 963<p><hr> 964<a name="ntpd-Usage"></a>Next: <a rel="next" accesskey="n" href="#ntpd-Files">ntpd Files</a>, 965Previous: <a rel="previous" accesskey="p" href="#ntpd-exit-status">ntpd exit status</a>, 966Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 967<br> 968</div> 969 970<h4 class="subsection">ntpd Usage</h4> 971 972<div class="node"> 973<p><hr> 974<a name="ntpd-Files"></a>Next: <a rel="next" accesskey="n" href="#ntpd-See-Also">ntpd See Also</a>, 975Previous: <a rel="previous" accesskey="p" href="#ntpd-Usage">ntpd Usage</a>, 976Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 977<br> 978</div> 979 980<h4 class="subsection">ntpd Files</h4> 981 982<div class="node"> 983<p><hr> 984<a name="ntpd-See-Also"></a>Next: <a rel="next" accesskey="n" href="#ntpd-Bugs">ntpd Bugs</a>, 985Previous: <a rel="previous" accesskey="p" href="#ntpd-Files">ntpd Files</a>, 986Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 987<br> 988</div> 989 990<h4 class="subsection">ntpd See Also</h4> 991 992<div class="node"> 993<p><hr> 994<a name="ntpd-Bugs"></a>Next: <a rel="next" accesskey="n" href="#ntpd-Notes">ntpd Notes</a>, 995Previous: <a rel="previous" accesskey="p" href="#ntpd-See-Also">ntpd See Also</a>, 996Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 997<br> 998</div> 999 1000<h4 class="subsection">ntpd Bugs</h4> 1001 1002<div class="node"> 1003<p><hr> 1004<a name="ntpd-Notes"></a>Previous: <a rel="previous" accesskey="p" href="#ntpd-Bugs">ntpd Bugs</a>, 1005Up: <a rel="up" accesskey="u" href="#ntpd-Invocation">ntpd Invocation</a> 1006<br> 1007</div> 1008 1009<h4 class="subsection">ntpd Notes</h4> 1010 1011<div class="node"> 1012<p><hr> 1013<a name="Usage"></a> 1014<br> 1015</div> 1016 1017<!-- node-name, next, previous, up --> 1018<h3 class="section">Usage</h3> 1019 1020