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NTPD(1)			      Programmer's Manual		       NTPD(1)

NAME
       ntpd - NTP daemon program

SYNOPSIS
       ntpd [-flag [value]]... [--opt-name [[=| ]value]]...

       All arguments must be options.

DESCRIPTION
       This manual page documents, briefly, the ntpd command.

OPTIONS
       -4, --ipv4
	      Force  IPv4 DNS name resolution.	This option is a member of the
	      ipv4 class of options.

	      Force DNS resolution of following host names on the command line
	      to the IPv4 namespace.

       -6, --ipv6
	      Force  IPv6 DNS name resolution.	This option is a member of the
	      ipv4 class of options.

	      Force DNS resolution of following host names on the command line
	      to the IPv6 namespace.

       -a, --authreq
	      Require  crypto  authentication.	This option must not appear in
	      combination with any of the following options: authnoreq.

	      Require cryptographic authentication for broadcast client,  mul‐
	      ticast  client  and symmetric passive associations.  This is the
	      default.

       -A, --authnoreq
	      Do not require crypto  authentication.   This  option  must  not
	      appear  in  combination  with  any  of  the  following  options:
	      authreq.

	      Do  not  require	cryptographic  authentication  for   broadcast
	      client,  multicast  client  and  symmetric passive associations.
	      This is almost never a good idea.

       -b, --bcastsync
	      Allow us to sync to broadcast servers.

       -c string, --configfile=string
	      configuration file name.

	      The name and path of the configuration  file,  /etc/ntp.conf  by
	      default.

       -d, --debug-level
	      Increase	output debug message level.  This option may appear an
	      unlimited number of times.

	      Increase the debugging message output level.

       -D string, --set-debug-level=string
	      Set the output debug message level.  This option may  appear  an
	      unlimited number of times.

	      Set the output debugging level.  Can be supplied multiple times,
	      but each overrides the previous value(s).

       -f string, --driftfile=string
	      frequency drift file name.

	      The name and path	 of  the  frequency  file,  /etc/ntp.drift  by
	      default.	 This is the same operation as the driftfile driftfile
	      configuration specification in the /etc/ntp.conf file.

       -g, --panicgate
	      Allow the first adjustment to be Big.

	      Normally, ntpd exits 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 thresh‐
	      old is exceeded after that, ntpd will exit with a message to the
	      system  log. This option can be used with the -q and -x options.
	      See the tinker configuration file directive for other options.

       -i string, --jaildir=string
	      Jail directory.

	      Chroot the server to the	directory  jaildir  This  option  also
	      implies  that  the  server  attempts  to drop root privileges at
	      startup (otherwise, chroot gives very  little  additional	 secu‐
	      rity),  and  it  is only available if the OS supports to run the
	      server without full root privileges.  You may need to also spec‐
	      ify a -u option.

       -I iface, --interface=iface
	      Listen on interface.  This option may appear an unlimited number
	      of times.

       -k string, --keyfile=string
	      path to symmetric keys.

	      Specify  the  name  and  path  of	 the   symmetric   key	 file.
	      /etc/ntp.keys is the default.  This is the same operation as the
	      keys keyfile configuration file directive.

       -l string, --logfile=string
	      path to the log file.

	      Specify the name and path of the log file.  The default  is  the
	      system log file.	This is the same operation as the logfile log‐
	      file configuration file directive.

       -L, --novirtualips
	      Do not listen to virtual IPs.

	      Do not listen to virtual IPs. The default is to listen.

       -M, --modifymmtimer
	      Modify Multimedia Timer (Windows only).

	      Set the Windows Multimedia Timer to highest resolution.

       -n, --nofork
	      Do not fork.

       -N, --nice
	      Run at high priority.

	      To the extent permitted by the operating system, run ntpd at the
	      highest priority.

       -p string, --pidfile=string
	      path to the PID file.

	      Specify  the  name  and  path  of the file used to record ntpd's
	      process ID.  This is the same operation as the  pidfile  pidfile
	      configuration file directive.

       -P number, --priority=number
	      Process  priority.   This	 option takes an integer number as its
	      argument.

	      To the extent permitted by the operating system, run ntpd at the
	      specified sched_setscheduler(SCHED_FIFO) priority.

       -q, --quit
	      Set the time and quit.

	      ntpd  will exit just after the first time the clock is set. This
	      behavior mimics that of the ntpdate  program,  which  is	to  be
	      retired.	 The  -g  and -x options can be used with this option.
	      Note: The kernel time discipline is disabled with this option.

       -r string, --propagationdelay=string
	      Broadcast/propagation delay.

	      Specify the default propagation delay from the  broadcast/multi‐
	      cast  server to this client. This is necessary only if the delay
	      cannot be computed automatically by the protocol.

       -U number, --updateinterval=number
	      interval in seconds between scans for new or dropped interfaces.
	      This option takes an integer number as its argument.

	      Give  the	 time  in seconds between two scans for new or dropped
	      interfaces.  For systems with routing socket support  the	 scans
	      will  be	performed  shortly after the interface change has been
	      detected by the system.  Use 0 to disable scanning.

       -s string, --statsdir=string
	      Statistics file location.

	      Specify the directory path for files created by  the  statistics
	      facility.	  This	is the same operation as the statsdir statsdir
	      configuration file directive.

       -t tkey, --trustedkey=tkey
	      Trusted key number.  This option may appear an unlimited	number
	      of times.

	      Add a key number to the trusted key list.

       -u string, --user=string
	      Run as userid (or userid:groupid).

	      Specify  a  user,	 and  optionally  a group, to switch to.  This
	      option is only available if the OS supports to  run  the	server
	      without  full  root  privileges.	Currently, this option is sup‐
	      ported under NetBSD  (configure  with  --enable-clockctl	)  and
	      Linux (configure with --enable-linuxcaps ).

       -v nvar, --var=nvar
	      make ARG an ntp variable (RW).  This option may appear an unlim‐
	      ited number of times.

       -V ndvar, --dvar=ndvar
	      make ARG an ntp variable (RW|DEF).  This option  may  appear  an
	      unlimited number of times.

       -x, --slew
	      Slew up to 600 seconds.

	      Normally, 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.   This	 option	 sets the threshold to 600 s, which is
	      well within the accuracy	window	to  set	 the  clock  manually.
	      Note:  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.  Thus, an adjustment as much as 600 s will
	      take almost 14 days to complete.	This option can be  used  with
	      the -g and -q options.  See the tinker configuration file direc‐
	      tive for other options.  Note: The  kernel  time	discipline  is
	      disabled with this option.

       -?, --help
	      Display usage information and exit.

       -!, --more-help
	      Extended usage information passed thru pager.

       -v [{v|c|n}], --version[={v|c|n}]
	      Output  version of program and exit.  The default mode is `v', a
	      simple version.  The `c' mode will print	copyright  information
	      and `n' will print the full copyright notice.

OPTION PRESETS
       Any option that is not marked as not presettable may be preset by load‐
       ing values from environment variables named:
	 NTPD_<option-name> or NTPD

AUTHOR
       David L. Mills and/or others
       Please send bug reports to:  http://bugs.ntp.org, bugs@ntp.org

       see html/copyright.html

       This manual page was AutoGen-erated from the ntpd option definitions.

( 4.2.4p8)			  2009-12-08			       NTPD(1)
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