ntpd man page on BSDi

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ntp(8)			  BSD System Manager's Manual			ntp(8)

NAME
     ntpd, ntpdate, ntpdc, ntpq, ntptimeset, ntptrace, tickadj - Network Time
     Protocol

DESCRIPTION
     The complete documentation for the ntpd, ntpdate, ntpdc, ntpq,
     ntptimeset, ntptrace, and tickadj commands from the NTP distribution is
     only available in HTML form:

	   ntpd:	file:///usr/share/doc/ntp/ntpd.htm
	   ntpdate:	file:///usr/share/doc/ntp/ntpdate.htm
	   ntpdc:	file:///usr/share/doc/ntp/ntpdc.htm
	   ntpq:	file:///usr/share/doc/ntp/ntpq.htm
	   ntptimeset:	file:///usr/share/doc/ntp/ntptime.htm
	   ntptrace:	file:///usr/share/doc/ntp/ntptrace.htm
	   tickadj:	file:///usr/share/doc/ntp/tickadj.htm
	   general:	file:///usr/share/doc/ntp/index.htm

     Use lynx(1) or netscape(1) to view these documents.

SEE ALSO
     date(1),  adjtime(2),  getttimeofday(2).

BUGS
     For security reasons, the system will not permit ntpdate to step the time
     to an earlier time than the current time if the security level is greater
     than zero.	 If the -b flag to ntpdate is not specified, it will always
     use adjtime(2) to correct the time gradually.  When the security level is
     zero (for example, when in single user mode) the -b flag may be used to
     force ntpdate to step the time backwards if necessary.  Ntpd is aware of
     this limitation and will only slew the time (see adjtime(2)).

     When booting, if the file /etc/ntp.conf exists, rc(8) scans it for
     ``broadcastclient'', ``multicastclient'', ``peer'', and ``server'' key-
     words.  If any are found, it runs ntpdate with the -b flag to sync time
     with the listed time servers.  This will step the clock close to the cur-
     rent time in single-user mode, which will allow ntpd to tune it more
     finely when the system is in multi-user mode.

     Ntpd is only able to compensate for a system clock that has an error of
     less than 100PPM (about .01%).  For clocks with an error greater than
     this, the kernel tick variable will need to be adjusted from /etc/rc us-
     ing the tickadj command.  The procedure for doing this is documented in
     the ``Dealing with Frequency Tolerance Violations'' section of ``"Notes
     on Configuring NTP and Setting up a NTP Subnet"'' in the HTML documenta-
     tion referred to above.  Note that the tickadj command should not be used
     to set the tickadj kernel variable.

BSDI BSD/OS		       October 20, 1999				     1
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