ntpdc.8 revision 309007
1.Dd November 21 2016 2.Dt NTPDC 8 User Commands 3.Os 4.\" EDIT THIS FILE WITH CAUTION (ntpdc-opts.mdoc) 5.\" 6.\" $FreeBSD: stable/11/usr.sbin/ntp/doc/ntpdc.8 309007 2016-11-22 16:22:51Z delphij $ 7.\" 8.\" It has been AutoGen-ed November 21, 2016 at 08:02:35 AM by AutoGen 5.18.5 9.\" From the definitions ntpdc-opts.def 10.\" and the template file agmdoc-cmd.tpl 11.Sh NAME 12.Nm ntpdc 13.Nd vendor-specific NTPD control program 14.Sh SYNOPSIS 15.Nm 16.\" Mixture of short (flag) options and long options 17.Op Fl flags 18.Op Fl flag Op Ar value 19.Op Fl \-option\-name Ns Oo Oo Ns "=| " Oc Ns Ar value Oc 20[ host ...] 21.Pp 22.Sh DESCRIPTION 23.Nm 24is deprecated. 25Please use 26.Xr ntpq 8 instead \- it can do everything 27.Nm 28used to do, and it does so using a much more sane interface. 29.Pp 30.Nm 31is a utility program used to query 32.Xr ntpd 8 33about its 34current state and to request changes in that state. 35It uses NTP mode 7 control message formats described in the source code. 36The program may 37be run either in interactive mode or controlled using command line 38arguments. 39Extensive state and statistics information is available 40through the 41.Nm 42interface. 43In addition, nearly all the 44configuration options which can be specified at startup using 45ntpd's configuration file may also be specified at run time using 46.Nm . 47.Sh "OPTIONS" 48.Bl -tag 49.It Fl 4 , Fl \-ipv4 50Force IPv4 DNS name resolution. 51This option must not appear in combination with any of the following options: 52ipv6. 53.sp 54Force DNS resolution of following host names on the command line 55to the IPv4 namespace. 56.It Fl 6 , Fl \-ipv6 57Force IPv6 DNS name resolution. 58This option must not appear in combination with any of the following options: 59ipv4. 60.sp 61Force DNS resolution of following host names on the command line 62to the IPv6 namespace. 63.It Fl c Ar cmd , Fl \-command Ns = Ns Ar cmd 64run a command and exit. 65This option may appear an unlimited number of times. 66.sp 67The following argument is interpreted as an interactive format command 68and is added to the list of commands to be executed on the specified 69host(s). 70.It Fl d , Fl \-debug\-level 71Increase debug verbosity level. 72This option may appear an unlimited number of times. 73.sp 74.It Fl D Ar number , Fl \-set\-debug\-level Ns = Ns Ar number 75Set the debug verbosity level. 76This option may appear an unlimited number of times. 77This option takes an integer number as its argument. 78.sp 79.It Fl i , Fl \-interactive 80Force ntpq to operate in interactive mode. 81This option must not appear in combination with any of the following options: 82command, listpeers, peers, showpeers. 83.sp 84Force ntpq to operate in interactive mode. Prompts will be written 85to the standard output and commands read from the standard input. 86.It Fl l , Fl \-listpeers 87Print a list of the peers. 88This option must not appear in combination with any of the following options: 89command. 90.sp 91Print a list of the peers known to the server as well as a summary of 92their state. This is equivalent to the 'listpeers' interactive command. 93.It Fl n , Fl \-numeric 94numeric host addresses. 95.sp 96Output all host addresses in dotted\-quad numeric format rather than 97converting to the canonical host names. 98.It Fl p , Fl \-peers 99Print a list of the peers. 100This option must not appear in combination with any of the following options: 101command. 102.sp 103Print a list of the peers known to the server as well as a summary 104of their state. This is equivalent to the 'peers' interactive command. 105.It Fl s , Fl \-showpeers 106Show a list of the peers. 107This option must not appear in combination with any of the following options: 108command. 109.sp 110Print a list of the peers known to the server as well as a summary 111of their state. This is equivalent to the 'dmpeers' interactive command. 112.It Fl \&? , Fl \-help 113Display usage information and exit. 114.It Fl \&! , Fl \-more\-help 115Pass the extended usage information through a pager. 116.It Fl > Oo Ar cfgfile Oc , Fl \-save\-opts Oo Ns = Ns Ar cfgfile Oc 117Save the option state to \fIcfgfile\fP. The default is the \fIlast\fP 118configuration file listed in the \fBOPTION PRESETS\fP section, below. 119The command will exit after updating the config file. 120.It Fl < Ar cfgfile , Fl \-load\-opts Ns = Ns Ar cfgfile , Fl \-no\-load\-opts 121Load options from \fIcfgfile\fP. 122The \fIno\-load\-opts\fP form will disable the loading 123of earlier config/rc/ini files. \fI\-\-no\-load\-opts\fP is handled early, 124out of order. 125.It Fl \-version Op Brq Ar v|c|n 126Output version of program and exit. The default mode is `v', a simple 127version. The `c' mode will print copyright information and `n' will 128print the full copyright notice. 129.El 130.Sh "OPTION PRESETS" 131Any option that is not marked as \fInot presettable\fP may be preset 132by loading values from configuration ("RC" or ".INI") file(s) and values from 133environment variables named: 134.nf 135 \fBNTPDC_<option\-name>\fP or \fBNTPDC\fP 136.fi 137.ad 138The environmental presets take precedence (are processed later than) 139the configuration files. 140The \fIhomerc\fP files are "\fI$HOME\fP", and "\fI.\fP". 141If any of these are directories, then the file \fI.ntprc\fP 142is searched for within those directories. 143.Sh USAGE 144If one or more request options are included on the command line 145when 146.Nm 147is executed, each of the requests will be sent 148to the NTP servers running on each of the hosts given as command 149line arguments, or on localhost by default. 150If no request options 151are given, 152.Nm 153will attempt to read commands from the 154standard input and execute these on the NTP server running on the 155first host given on the command line, again defaulting to localhost 156when no other host is specified. 157The 158.Nm 159utility will prompt for 160commands if the standard input is a terminal device. 161.Pp 162The 163.Nm 164utility uses NTP mode 7 packets to communicate with the 165NTP server, and hence can be used to query any compatible server on 166the network which permits it. 167Note that since NTP is a UDP protocol 168this communication will be somewhat unreliable, especially over 169large distances in terms of network topology. 170The 171.Nm 172utility makes 173no attempt to retransmit requests, and will time requests out if 174the remote host is not heard from within a suitable timeout 175time. 176.Pp 177The operation of 178.Nm 179are specific to the particular 180implementation of the 181.Xr ntpd 8 182daemon and can be expected to 183work only with this and maybe some previous versions of the daemon. 184Requests from a remote 185.Nm 186utility which affect the 187state of the local server must be authenticated, which requires 188both the remote program and local server share a common key and key 189identifier. 190.Pp 191Note that in contexts where a host name is expected, a 192.Fl 4 193qualifier preceding the host name forces DNS resolution to the IPv4 namespace, 194while a 195.Fl 6 196qualifier forces DNS resolution to the IPv6 namespace. 197Specifying a command line option other than 198.Fl i 199or 200.Fl n 201will cause the specified query (queries) to be sent to 202the indicated host(s) immediately. 203Otherwise, 204.Nm 205will 206attempt to read interactive format commands from the standard 207input. 208.Ss "Interactive Commands" 209Interactive format commands consist of a keyword followed by zero 210to four arguments. 211Only enough characters of the full keyword to 212uniquely identify the command need be typed. 213The output of a 214command is normally sent to the standard output, but optionally the 215output of individual commands may be sent to a file by appending a 216.Ql \&> , 217followed by a file name, to the command line. 218.Pp 219A number of interactive format commands are executed entirely 220within the 221.Nm 222utility itself and do not result in NTP 223mode 7 requests being sent to a server. 224These are described 225following. 226.Bl -tag -width indent 227.It Ic \&? Ar command_keyword 228.It Ic help Ar command_keyword 229A 230.Sq Ic \&? 231will print a list of all the command 232keywords known to this incarnation of 233.Nm . 234A 235.Sq Ic \&? 236followed by a command keyword will print function and usage 237information about the command. 238This command is probably a better 239source of information about 240.Xr ntpq 8 241than this manual 242page. 243.It Ic delay Ar milliseconds 244Specify a time interval to be added to timestamps included in 245requests which require authentication. 246This is used to enable 247(unreliable) server reconfiguration over long delay network paths 248or between machines whose clocks are unsynchronized. 249Actually the 250server does not now require timestamps in authenticated requests, 251so this command may be obsolete. 252.It Ic host Ar hostname 253Set the host to which future queries will be sent. 254Hostname may 255be either a host name or a numeric address. 256.It Ic hostnames Op Cm yes | Cm no 257If 258.Cm yes 259is specified, host names are printed in 260information displays. 261If 262.Cm no 263is specified, numeric 264addresses are printed instead. 265The default is 266.Cm yes , 267unless 268modified using the command line 269.Fl n 270switch. 271.It Ic keyid Ar keyid 272This command allows the specification of a key number to be 273used to authenticate configuration requests. 274This must correspond 275to a key number the server has been configured to use for this 276purpose. 277.It Ic quit 278Exit 279.Nm . 280.It Ic passwd 281This command prompts you to type in a password (which will not 282be echoed) which will be used to authenticate configuration 283requests. 284The password must correspond to the key configured for 285use by the NTP server for this purpose if such requests are to be 286successful. 287.It Ic timeout Ar milliseconds 288Specify a timeout period for responses to server queries. 289The 290default is about 8000 milliseconds. 291Note that since 292.Nm 293retries each query once after a timeout, the total waiting time for 294a timeout will be twice the timeout value set. 295.El 296.Ss "Control Message Commands" 297Query commands result in NTP mode 7 packets containing requests for 298information being sent to the server. 299These are read\-only commands 300in that they make no modification of the server configuration 301state. 302.Bl -tag -width indent 303.It Ic listpeers 304Obtains and prints a brief list of the peers for which the 305server is maintaining state. 306These should include all configured 307peer associations as well as those peers whose stratum is such that 308they are considered by the server to be possible future 309synchronization candidates. 310.It Ic peers 311Obtains a list of peers for which the server is maintaining 312state, along with a summary of that state. 313Summary information 314includes the address of the remote peer, the local interface 315address (0.0.0.0 if a local address has yet to be determined), the 316stratum of the remote peer (a stratum of 16 indicates the remote 317peer is unsynchronized), the polling interval, in seconds, the 318reachability register, in octal, and the current estimated delay, 319offset and dispersion of the peer, all in seconds. 320.Pp 321The character in the left margin indicates the mode this peer 322entry is operating in. 323A 324.Ql \&+ 325denotes symmetric active, a 326.Ql \&\- 327indicates symmetric passive, a 328.Ql \&= 329means the 330remote server is being polled in client mode, a 331.Ql \&^ 332indicates that the server is broadcasting to this address, a 333.Ql \&~ 334denotes that the remote peer is sending broadcasts and a 335.Ql \&~ 336denotes that the remote peer is sending broadcasts and a 337.Ql \&* 338marks the peer the server is currently synchronizing 339to. 340.Pp 341The contents of the host field may be one of four forms. 342It may 343be a host name, an IP address, a reference clock implementation 344name with its parameter or 345.Fn REFCLK "implementation_number" "parameter" . 346On 347.Ic hostnames 348.Cm no 349only IP\-addresses 350will be displayed. 351.It Ic dmpeers 352A slightly different peer summary list. 353Identical to the output 354of the 355.Ic peers 356command, except for the character in the 357leftmost column. 358Characters only appear beside peers which were 359included in the final stage of the clock selection algorithm. 360A 361.Ql \&. 362indicates that this peer was cast off in the falseticker 363detection, while a 364.Ql \&+ 365indicates that the peer made it 366through. 367A 368.Ql \&* 369denotes the peer the server is currently 370synchronizing with. 371.It Ic showpeer Ar peer_address Oo Ar ... Oc 372Shows a detailed display of the current peer variables for one 373or more peers. 374Most of these values are described in the NTP 375Version 2 specification. 376.It Ic pstats Ar peer_address Oo Ar ... Oc 377Show per\-peer statistic counters associated with the specified 378peer(s). 379.It Ic clockstat Ar clock_peer_address Oo Ar ... Oc 380Obtain and print information concerning a peer clock. 381The 382values obtained provide information on the setting of fudge factors 383and other clock performance information. 384.It Ic kerninfo 385Obtain and print kernel phase\-lock loop operating parameters. 386This information is available only if the kernel has been specially 387modified for a precision timekeeping function. 388.It Ic loopinfo Op Cm oneline | Cm multiline 389Print the values of selected loop filter variables. 390The loop 391filter is the part of NTP which deals with adjusting the local 392system clock. 393The 394.Sq offset 395is the last offset given to the 396loop filter by the packet processing code. 397The 398.Sq frequency 399is the frequency error of the local clock in parts\-per\-million 400(ppm). 401The 402.Sq time_const 403controls the stiffness of the 404phase\-lock loop and thus the speed at which it can adapt to 405oscillator drift. 406The 407.Sq watchdog timer 408value is the number 409of seconds which have elapsed since the last sample offset was 410given to the loop filter. 411The 412.Cm oneline 413and 414.Cm multiline 415options specify the format in which this 416information is to be printed, with 417.Cm multiline 418as the 419default. 420.It Ic sysinfo 421Print a variety of system state variables, i.e., state related 422to the local server. 423All except the last four lines are described 424in the NTP Version 3 specification, RFC\-1305. 425.Pp 426The 427.Sq system flags 428show various system flags, some of 429which can be set and cleared by the 430.Ic enable 431and 432.Ic disable 433configuration commands, respectively. 434These are 435the 436.Cm auth , 437.Cm bclient , 438.Cm monitor , 439.Cm pll , 440.Cm pps 441and 442.Cm stats 443flags. 444See the 445.Xr ntpd 8 446documentation for the meaning of these flags. 447There 448are two additional flags which are read only, the 449.Cm kernel_pll 450and 451.Cm kernel_pps . 452These flags indicate 453the synchronization status when the precision time kernel 454modifications are in use. 455The 456.Sq kernel_pll 457indicates that 458the local clock is being disciplined by the kernel, while the 459.Sq kernel_pps 460indicates the kernel discipline is provided by the PPS 461signal. 462.Pp 463The 464.Sq stability 465is the residual frequency error remaining 466after the system frequency correction is applied and is intended for 467maintenance and debugging. 468In most architectures, this value will 469initially decrease from as high as 500 ppm to a nominal value in 470the range .01 to 0.1 ppm. 471If it remains high for some time after 472starting the daemon, something may be wrong with the local clock, 473or the value of the kernel variable 474.Va kern.clockrate.tick 475may be 476incorrect. 477.Pp 478The 479.Sq broadcastdelay 480shows the default broadcast delay, 481as set by the 482.Ic broadcastdelay 483configuration command. 484.Pp 485The 486.Sq authdelay 487shows the default authentication delay, 488as set by the 489.Ic authdelay 490configuration command. 491.It Ic sysstats 492Print statistics counters maintained in the protocol 493module. 494.It Ic memstats 495Print statistics counters related to memory allocation 496code. 497.It Ic iostats 498Print statistics counters maintained in the input\-output 499module. 500.It Ic timerstats 501Print statistics counters maintained in the timer/event queue 502support code. 503.It Ic reslist 504Obtain and print the server's restriction list. 505This list is 506(usually) printed in sorted order and may help to understand how 507the restrictions are applied. 508.It Ic monlist Op Ar version 509Obtain and print traffic counts collected and maintained by the 510monitor facility. 511The version number should not normally need to be 512specified. 513.It Ic clkbug Ar clock_peer_address Oo Ar ... Oc 514Obtain debugging information for a reference clock driver. 515This 516information is provided only by some clock drivers and is mostly 517undecodable without a copy of the driver source in hand. 518.El 519.Ss "Runtime Configuration Requests" 520All requests which cause state changes in the server are 521authenticated by the server using a configured NTP key (the 522facility can also be disabled by the server by not configuring a 523key). 524The key number and the corresponding key must also be made 525known to 526.Nm . 527This can be done using the 528.Ic keyid 529and 530.Ic passwd 531commands, the latter of which will prompt at the terminal for a 532password to use as the encryption key. 533You will also be prompted 534automatically for both the key number and password the first time a 535command which would result in an authenticated request to the 536server is given. 537Authentication not only provides verification that 538the requester has permission to make such changes, but also gives 539an extra degree of protection again transmission errors. 540.Pp 541Authenticated requests always include a timestamp in the packet 542data, which is included in the computation of the authentication 543code. 544This timestamp is compared by the server to its receive time 545stamp. 546If they differ by more than a small amount the request is 547rejected. 548This is done for two reasons. 549First, it makes simple 550replay attacks on the server, by someone who might be able to 551overhear traffic on your LAN, much more difficult. 552Second, it makes 553it more difficult to request configuration changes to your server 554from topologically remote hosts. 555While the reconfiguration facility 556will work well with a server on the local host, and may work 557adequately between time\-synchronized hosts on the same LAN, it will 558work very poorly for more distant hosts. 559As such, if reasonable 560passwords are chosen, care is taken in the distribution and 561protection of keys and appropriate source address restrictions are 562applied, the run time reconfiguration facility should provide an 563adequate level of security. 564.Pp 565The following commands all make authenticated requests. 566.Bl -tag -width indent 567.It Xo Ic addpeer Ar peer_address 568.Op Ar keyid 569.Op Ar version 570.Op Cm prefer 571.Xc 572Add a configured peer association at the given address and 573operating in symmetric active mode. 574Note that an existing 575association with the same peer may be deleted when this command is 576executed, or may simply be converted to conform to the new 577configuration, as appropriate. 578If the optional 579.Ar keyid 580is a 581nonzero integer, all outgoing packets to the remote server will 582have an authentication field attached encrypted with this key. 583If 584the value is 0 (or not given) no authentication will be done. 585The 586.Ar version 587can be 1, 2 or 3 and defaults to 3. 588The 589.Cm prefer 590keyword indicates a preferred peer (and thus will 591be used primarily for clock synchronisation if possible). 592The 593preferred peer also determines the validity of the PPS signal \- if 594the preferred peer is suitable for synchronisation so is the PPS 595signal. 596.It Xo Ic addserver Ar peer_address 597.Op Ar keyid 598.Op Ar version 599.Op Cm prefer 600.Xc 601Identical to the addpeer command, except that the operating 602mode is client. 603.It Xo Ic broadcast Ar peer_address 604.Op Ar keyid 605.Op Ar version 606.Op Cm prefer 607.Xc 608Identical to the addpeer command, except that the operating 609mode is broadcast. 610In this case a valid key identifier and key are 611required. 612The 613.Ar peer_address 614parameter can be the broadcast 615address of the local network or a multicast group address assigned 616to NTP. 617If a multicast address, a multicast\-capable kernel is 618required. 619.It Ic unconfig Ar peer_address Oo Ar ... Oc 620This command causes the configured bit to be removed from the 621specified peer(s). 622In many cases this will cause the peer 623association to be deleted. 624When appropriate, however, the 625association may persist in an unconfigured mode if the remote peer 626is willing to continue on in this fashion. 627.It Xo Ic fudge Ar peer_address 628.Op Cm time1 629.Op Cm time2 630.Op Ar stratum 631.Op Ar refid 632.Xc 633This command provides a way to set certain data for a reference 634clock. 635See the source listing for further information. 636.It Xo Ic enable 637.Oo 638.Cm auth | Cm bclient | 639.Cm calibrate | Cm kernel | 640.Cm monitor | Cm ntp | 641.Cm pps | Cm stats 642.Oc 643.Xc 644.It Xo Ic disable 645.Oo 646.Cm auth | Cm bclient | 647.Cm calibrate | Cm kernel | 648.Cm monitor | Cm ntp | 649.Cm pps | Cm stats 650.Oc 651.Xc 652These commands operate in the same way as the 653.Ic enable 654and 655.Ic disable 656configuration file commands of 657.Xr ntpd 8 . 658.Bl -tag -width indent 659.It Cm auth 660Enables the server to synchronize with unconfigured peers only 661if the peer has been correctly authenticated using either public key 662or private key cryptography. 663The default for this flag is enable. 664.It Cm bclient 665Enables the server to listen for a message from a broadcast or 666multicast server, as in the multicastclient command with 667default address. 668The default for this flag is disable. 669.It Cm calibrate 670Enables the calibrate feature for reference clocks. 671The default for this flag is disable. 672.It Cm kernel 673Enables the kernel time discipline, if available. 674The default for this flag is enable if support is available, otherwise disable. 675.It Cm monitor 676Enables the monitoring facility. 677See the documentation here about the 678.Cm monlist 679command or further information. 680The default for this flag is enable. 681.It Cm ntp 682Enables time and frequency discipline. 683In effect, this switch opens and closes the feedback loop, 684which is useful for testing. 685The default for this flag is enable. 686.It Cm pps 687Enables the pulse\-per\-second (PPS) signal when frequency 688and time is disciplined by the precision time kernel modifications. 689See the 690.Qq A Kernel Model for Precision Timekeeping 691(available as part of the HTML documentation 692provided in 693.Pa /usr/share/doc/ntp ) 694page for further information. 695The default for this flag is disable. 696.It Cm stats 697Enables the statistics facility. 698See the 699.Sx Monitoring Options 700section of 701.Xr ntp.conf 5 702for further information. 703The default for this flag is disable. 704.El 705.It Xo Ic restrict Ar address Ar mask 706.Ar flag Oo Ar ... Oc 707.Xc 708This command operates in the same way as the 709.Ic restrict 710configuration file commands of 711.Xr ntpd 8 . 712.It Xo Ic unrestrict Ar address Ar mask 713.Ar flag Oo Ar ... Oc 714.Xc 715Unrestrict the matching entry from the restrict list. 716.It Xo Ic delrestrict Ar address Ar mask 717.Op Cm ntpport 718.Xc 719Delete the matching entry from the restrict list. 720.It Ic readkeys 721Causes the current set of authentication keys to be purged and 722a new set to be obtained by rereading the keys file (which must 723have been specified in the 724.Xr ntpd 8 725configuration file). 726This 727allows encryption keys to be changed without restarting the 728server. 729.It Ic trustedkey Ar keyid Oo Ar ... Oc 730.It Ic untrustedkey Ar keyid Oo Ar ... Oc 731These commands operate in the same way as the 732.Ic trustedkey 733and 734.Ic untrustedkey 735configuration file 736commands of 737.Xr ntpd 8 . 738.It Ic authinfo 739Returns information concerning the authentication module, 740including known keys and counts of encryptions and decryptions 741which have been done. 742.It Ic traps 743Display the traps set in the server. 744See the source listing for 745further information. 746.It Xo Ic addtrap Ar address 747.Op Ar port 748.Op Ar interface 749.Xc 750Set a trap for asynchronous messages. 751See the source listing 752for further information. 753.It Xo Ic clrtrap Ar address 754.Op Ar port 755.Op Ar interface 756.Xc 757Clear a trap for asynchronous messages. 758See the source listing 759for further information. 760.It Ic reset 761Clear the statistics counters in various modules of the server. 762See the source listing for further information. 763.El 764.Sh "ENVIRONMENT" 765See \fBOPTION PRESETS\fP for configuration environment variables. 766.Sh "FILES" 767See \fBOPTION PRESETS\fP for configuration files. 768.Sh "EXIT STATUS" 769One of the following exit values will be returned: 770.Bl -tag 771.It 0 " (EXIT_SUCCESS)" 772Successful program execution. 773.It 1 " (EXIT_FAILURE)" 774The operation failed or the command syntax was not valid. 775.It 66 " (EX_NOINPUT)" 776A specified configuration file could not be loaded. 777.It 70 " (EX_SOFTWARE)" 778libopts had an internal operational error. Please report 779it to autogen\-users@lists.sourceforge.net. Thank you. 780.El 781.Sh "SEE ALSO" 782.Xr ntp.conf 5 , 783.Xr ntpd 8 784.Rs 785.%A David L. Mills 786.%T Network Time Protocol (Version 3) 787.%O RFC1305 788.Re 789.Sh AUTHORS 790The formatting directives in this document came from FreeBSD. 791.Sh "COPYRIGHT" 792Copyright (C) 1992\-2016 The University of Delaware and Network Time Foundation all rights reserved. 793This program is released under the terms of the NTP license, <http://ntp.org/license>. 794.Sh BUGS 795The 796.Nm 797utility is a crude hack. 798Much of the information it shows is 799deadly boring and could only be loved by its implementer. 800The 801program was designed so that new (and temporary) features were easy 802to hack in, at great expense to the program's ease of use. 803Despite 804this, the program is occasionally useful. 805.Pp 806Please report bugs to http://bugs.ntp.org . 807.Pp 808Please send bug reports to: http://bugs.ntp.org, bugs@ntp.org 809.Sh "NOTES" 810This manual page was \fIAutoGen\fP\-erated from the \fBntpdc\fP 811option definitions. 812