Digital

NAME

xntpd − Network Time Protocol (NTP) daemon

SYNOPSIS

xntpd [ -bglsx ] [ -c conffile ] [ -f driftfile ] [ -r broaddelay ]

FLAGS

-bListens for broadcast NTP and synchronizes to this if available. 

-gAllows xntpd to correct any time difference, including differences greater than 1000 seconds. 

-lLimits log messages in syslog. 

-sProhibits xntpd from changing the system time. This option is used for compatibility with DECdts. 

-xAllows xntpd to set the system time backward using settimeofday(2) instead of adjtime(2). This is not recommended and might cause system failures. 

-c conffileSpecifies an alternate configuration file. 

-f driftfileSpecifies the location of the drift file. 

-r broaddelaySpecifies the default round trip delay (in seconds) to be used when synchronizing to broadcasts. 

DESCRIPTION

Xntpd is a daemon that maintains a system’s time−of−day in agreement with Internet standard time servers.  Xntpd is an implementation of the Network Time Protocol (NTP) version 2 standard as defined by RFC 1119, but without authentication. It also retains compatability with version 1 servers as defined by RFC 1059. (This includes servers running the University of Maryland ntpd . Xntpd does all computations in fixed point arithmetic and is entirely free of 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 which might introduce systematic bias into the integrations, 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 . Ntpsetup automatically configures your system to run xntpd , and should be used by all systems that receive time from other NTP servers.  xntpd can be monitored while the daemon is running by using either the ntpq(8) or the xntpdc(8) program. 

Xntpd includes support for local reference clocks and the Traconex 1010/1020 WWV/H receiver (formerly Precision Time Standard Inc.)  The 1010/1020 is a radio timecode receiver that is synchronized to a source of standard time, such as the services offered by the NRC in Canada and NIST in the U.S. The interface between the computer and the timecode receiver is device dependent and will vary, but is often a serial port. 

FILES

/etc/ntp.confDefault name of the configuration file

/etc/ntp.driftConventional name of the drift file

RELATED INFORMATION

ntp(1), ntp.conf(4), xntpdc(8), ntpq(8), ntpdate(8)

Guide to System and Network Setup and Configuration