xntpd - Network Time Protocol (NTP) daemon
/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]
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.
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.
Default name of the configuration file Conventional name
of the drift file Conventional name of the key file
Commands: ntp(1), ntpdate(8), ntpq(8), xntpdc(8)
Files: ntp.conf(4), ntp.keys(4)
Network Administration: Services
Written by Dennis Ferguson at the University of Toronto.
Text amended by David Mills at the University of Delaware.
xntpd(8)
[ Back ] | 