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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 briefly documents the ntpd command.


OPTIONS
       -4, --ipv4
              Force  IPv4  DNS  name resolution.  This option must not appear in combination with any of the
              following options: ipv6.

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

       -6, --ipv6
              Force IPv6 DNS name resolution.  This option must not appear in combination with  any  of  the
              following options: ipv4.

              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, multicast client and symmetric pas-sive passive
              sive 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 symmet-ric symmetric
              ric 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 previ-ous previous
              ous 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  opera-tion operation
              tion as the driftfile driftfile configuration specification in the /etc/ntp.conf file.

       -g, --panicgate
              Allow the first adjustment to be Big.  This option may appear an unlimited number of times.

              Normally,  ntpd exits with a message to the system log if the offset exceeds the panic thresh-old, threshold,
              old, 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, 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.  You may need to also specify a -u option.  This option is
              only  available  if  the  OS  supports adjusting the clock without full root privileges.  This
              option is supported under NetBSD (configure with --enable-clockctl ) and Linux (configure with
              --enable-linuxcaps ).

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

              Open the network address given, or all the addresses associated with the given interface name.
              This  option may appear multiple times.  This option also implies not opening other addresses,
              except wildcard and localhost.  This option is deprecated. Please consider using the  configu-ration configuration
              ration file interface command, which is more versatile.

       -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 logfile configuration file directive.

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

              Do  not  listen  to  virtual interfaces, defined as those with names containing a colon.  This
              option is deprecated.  Please consider using the configuration file interface  command,  which
              is more versatile.

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

              Set  the Windows Multimedia Timer to highest resolution.  This ensures the resolution does not
              change while ntpd is running, avoiding timekeeping glitches associated with changes.

       -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_setsched-uler(SCHED_FIFO) sched_setscheduler(SCHED_FIFO)
              uler(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/multicast server to this client. This
              is necessary only if the delay cannot be computed automatically by the protocol.

       --saveconfigquit=string
              Save parsed configuration and quit.

              Cause  ntpd  to parse its startup configuration file and save an equivalent to the given file-name filename
              name and exit.  This option was designed for automated testing.

       -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 adjusting the clock without full root privileges.  This  option  is  supported  under
              NetBSD (configure with --enable-clockctl ) and Linux (configure with --enable-linuxcaps ).

       -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. 60 seconds is  the  minimum  time  between
              scans.

       --var=nvar
              make ARG an ntp variable (RW).  This option may appear an unlimited number of times.



       --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  amortiza-tion amortization
              tion  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  directive  for  other  options.   Note: The kernel time discipline is disabled with this
              option.

       --usepcc
              Use CPU cycle counter (Windows only).

              Attempt to substitute the CPU  counter  for  QueryPerformanceCounter.   The  CPU  counter  and
              QueryPerformanceCounter  are  compared,  and  if they have the same frequency, the CPU counter
              (RDTSC on x86) is used directly, saving the overhead of a system call.

       --pccfreq=string
              Force CPU cycle counter use (Windows only).

              Force substitution the CPU counter for QueryPerformanceCounter.  The  CPU  counter  (RDTSC  on
              x86) is used unconditionally with the given frequency (in Hz).

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

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

       - [{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  loading  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.



( 4.2.6)                                         2009-12-10                                          NTPD(1)