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xntpd(8)


NAME

  xntpd - Network Time Protocol (NTP) daemon


SYNOPSIS

  /usr/sbin/xntpd [-abdgmx] [-c conffile] [-e auth_delay] [-f driftfile] [-k
  keyfile] [-l logfile] [-p pidfile] [-r broaddelay] [-s statdir] [-t
  trustedkey] [-v sysvar] [-V def_sysvar]


OPTIONS

  -a  Runs in authenticate mode.

  -b  Listens for broadcast NTP and synchronizes to this if available.

  -d  Specify debugging mode. This option may occur multiple times, with each
      occurence indicating greater detail of display.

  -g  Allows xntpd to correct any time difference, including differences
      greater than 1000 seconds.

  -m  Listens for multicast messages and synchronizes to them if available
      (requires multicast kernel).

  -x  Prevents xntpd from setting the system time backward.  In NTP version
      3, the default allows xntpd to set the system time backward.

  -c conffile
      Specifies an alternate configuration file.

  -e authdelay
      Specifies the time (in seconds) it takes to compute the NTP encryption
      field on this computer.

  -f driftfile
      Specifies the location of the drift file.

  -k keyfile
      Specifies the location of the file which contains the NTP
      authentication keys.  See ntp.keys(4) for information on the
      authentication key file format.

  -l logfile
      Specifies a log file instead of logging to syslog.

  -p pidfile
      Specifies the name of the file to record the daemon's process id.

  -r broaddelay
      Specifies the default round trip delay (in seconds) to be used if the
      daemon cannot automatically compensate for network delay when
      synchronizing to broadcasts.

  -s statdir
      Specifies the directory in which to create statistics files.

  -t trustedkey
      Adds a key number to the trusted key list.

  -v sysvar
      Adds a system variable.

  -V def_sysvar
      Adds a system variable listed by default.


DESCRIPTION

  The xntpd daemon maintains a system's time-of-day in agreement with
  Internet standard time servers.  The xntpd daemon is a complete
  implementation of the Network Time Protocol (NTP) version 3 standard as
  defined by RFC 1305, but also retains compatibility with version 1 and
  version 2 servers as defined by RFC 1059 and RFC 1119, respectively.

  The xntpd daemon does all computations in fixed point arithmetic and
  requires no floating point code.  The computations done in the protocol and
  clock adjustment code are carried out with high precision and with
  attention to the details that might introduce systematic bias into the
  computations, to try to maintain an accuracy suitable for synchronizing
  with even the most precise external time source.

  The xntpd daemon reads its configuration from a file at startup time.	 The
  default configuration file is /etc/ntp.conf. The xntpd daemon can be
  monitored and configuration options altered while the daemon is running by
  using either the ntpq(8) or the xntpdc(8) program.

  The xntpd daemon includes support for several commercially available
  external reference clocks. See ntp.conf(4) for information on the use and
  configuration of reference clocks.

  The Tru64 UNIX operating system also provides the NTP_TIME and MICRO_TIME
  kernel options to allow greater accuracy and time resolution. See
  ntp_intro(7) and Network Administration: Services for more information.


FILES

  /etc/ntp.conf
      Default name of the configuration file

  /etc/ntp.drift
      Conventional name of the drift file

  /etc/ntp.keys
      Conventional name of the key file


SEE ALSO

  Commands: ntp(1), ntpdate(8), ntpq(8), xntpdc(8)

  Files: ntp.conf(4), ntp.keys(4)

  Network Administration: Services


HISTORY

  Written by Dennis Ferguson at the University of Toronto.  Text amended by
  David Mills at the University of Delaware.

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