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NAME    [Toc]    [Back]

       xntpd - Network Time Protocol (NTP) daemon

SYNOPSIS    [Toc]    [Back]

       /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

OPTIONS    [Toc]    [Back]

       Runs in authenticate mode.  Listens for broadcast NTP  and
       synchronizes  to  this  if  available.   Specify debugging
       mode. This option may  occur  multiple  times,  with  each
       occurence  indicating  greater  detail of display.  Allows
       xntpd to correct any time  difference,  including  differences
  greater  than  1000 seconds.  Listens for multicast
       messages and synchronizes to them if  available  (requires
       multicast kernel).  Prevents xntpd from setting the system
       time backward.  In NTP version 3, the default allows xntpd
       to  set  the system time backward.  Specifies an alternate
       configuration file.  Specifies the time  (in  seconds)  it
       takes  to  compute  the  NTP encryption field on this computer.
  Specifies the location of the drift file.   Specifies
  the  location  of  the  file  which contains the NTP
       authentication keys.  See ntp.keys(4) for  information  on
       the  authentication key file format.  Specifies a log file
       instead of logging to syslog.  Specifies the name  of  the
       file  to  record  the  daemon's process id.  Specifies the
       default round trip delay (in seconds) to be  used  if  the
       daemon  cannot  automatically compensate for network delay
       when synchronizing to broadcasts.  Specifies the directory
       in which to create statistics files.  Adds a key number to
       the trusted key list.  Adds a  system  variable.   Adds  a
       system variable listed by default.

DESCRIPTION    [Toc]    [Back]

       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

       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

       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    [Toc]    [Back]

       Default name of the configuration file  Conventional  name
       of the drift file Conventional name of the key file

SEE ALSO    [Toc]    [Back]

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

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

       Network Administration: Services

HISTORY    [Toc]    [Back]

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

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