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xntpd(8)							     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 trust-
  edkey] [-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	authentica-
      tion 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 synchron-
      izing 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 Inter-
  net 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 atten-
  tion to the details that might introduce systematic bias into	the computa-
  tions, 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 moni-
  tored	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 exter-
  nal reference	clocks.	See ntp.conf(4)	for information	on the use and confi-
  guration 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.