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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] FLAGS Runs in authenticate mode. Listens for broadcast NTP and synchronizes to this if available. Specify debugging mode. This flag may occur mul- tiple 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 synchro- nizes 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 com- pute 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 log- ging 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 In- ternet standard time servers. The xntpd daemon is a complete implemen- tation 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. Xntpd 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 computa- tions, to try to maintain an accuracy suitable for synchronizing with even the most precise external time source. Xntpd reads its configuration from a file at startup time. The default configuration file is /etc/ntp.conf. The ntpsetup script automatically configures your system to run xntpd, and should be used by all systems that receive time from other NTP servers. The xntpd daemon can be mon- itored and configuration options altered while the daemon is running by using either the ntpq(8) or the xntpdc(8) program. Xntpd includes support for several commercially available external ref- erence clocks. See ntp.conf(4) for information on the use and configu- ration of reference clocks. The DIGITAL UNIX operating system also provides the NTP_TIME and MI- CRO_TIME kernel options to allow greater accuracy and time resolution. See ntp_intro(7) and System Administration for more information. FILES Default name of the configuration file Conventional name of the drift file Conventional name of the key file RELATED INFORMATION Commands: ntp(1), xntpdc(8), ntpq(8), ntpdate(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. delim off xntpd(8)