xntpd(8)						      System Manager's Manual							  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

       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 differ-
       ences greater than 1000 seconds.  Listens for multicast messages and synchronizes to them if available (requires multicast  kernel).   Pre-
       vents  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 infor-
       mation 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

       The  xntpd daemon maintains a system's time-of-day in agreement with Internet standard time servers.  The xntpd daemon is a complete imple-
       mentation 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 proto-
       col 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 for more information.

FILES

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

HISTORY

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

																	  xntpd(8)