NTP(8)							      System Manager's Manual							    NTP(8)

NAME

       ntp - query an ntp clock

SYNOPSIS

       ntp [-v] [-s] [-f] hosts...

DESCRIPTION

       ntp  sends  an ntp packet to the ntp daemon running on each of the given hosts.	A daemon fills in fields of the ntp packet as per RFC-????
       and sends the packet back.  ntp then formats and prints the result on the standard output.

       The default output shows the delay, offset, and date in ctime() format.

       Options can reset the time of the local system clock.

OPTIONS

       -v     Verbose output, showing the full contents of received ntp packets, plus caluclated offset, displacement, etc.

       -s     Set system time-of-day clock.  Will only happen if time offset is less than compiled-in constant WAYTOBIG (currently 1000  seconds).
	      Will not happen if remote host is unsynchronized.

       -f     Force  setting  system  clock  regardless  of  offset.  Must be used with -s option.  Still will not reset clock if remote system is
	      unsynchronized.

NTP RESULTS

       The default output for each host looks like this:
	   128.8.10.1: delay:1.845207 offset:-0.358460	Mon Mar 20 08:05:44 1989

       The verbose output for each host looks like this:
	   Packet from: [128.8.10.1]
	   Leap 0, version 1, mode Server, poll 6, precision -10 stratum 1 (WWVB)
	   Synch Distance is 0000.1999	0.099991
	   Synch Dispersion is 0000.0000  0.000000
	   Reference Timestamp is a7bea6c3.88b40000 Tue Mar  7 14:06:43 1989
	   Originate Timestamp is a7bea6d7.d7e6e652 Tue Mar  7 14:07:03 1989
	   Receive Timestamp is   a7bea6d7.cf1a0000 Tue Mar  7 14:07:03 1989
	   Transmit Timestamp is  a7bea6d8.0ccc0000 Tue Mar  7 14:07:04 1989
	   Input Timestamp is	  a7bea6d8.1a77e5ea Tue Mar  7 14:07:04 1989
	   umd1: delay:0.019028 offset:-0.043890  Tue Mar  7 14:07:04 1989
	     The various fields are interpreted as follows:

       Packet from: [address]
	      The address that this ntp packet was received from.

       Leap indicator: n
	      The leap second indicator.  Non-zero if there is to be a leap second added or subtracted at the new year.

       Status: n

       Stratum: n (source)
	      The stratum of the clock in the NTP hierarchy, along with the source of the clock, either the name of a reference standard (such	as
	      WWVB or GOES) or the Internet address of the clock that this clock is derived from.

       Poll = n
	      The desired poll rate of the peer.

       Precision = exponent (dec)
	      The claimed precision of the clock, in seconds.

       Synchronizing Dist is ???

       Synchronizing Dispersion is ???

       The  next five timestamps are given as NTP fixed-point values, in both hexadecimal and ctime(3).  These are set either by this ntp process,
       or by the server we are quering.

       Reference Timestamp is hex-timestamp  ctime string
	      The last time the server clock was adjusted. (remote time)

       Originate Timestamp is hex-timestamp  ctime string
	      When the ntp request was transmitted by us to the server.  (local time)

       Receive Timestamp is   hex-timestamp  ctime string
	      When the ntp request was received at the server.	(remote time)

       Transmit Timestamp is  hex-timestamp  ctime string
	      When the ntp response was transmitted by the server.  (remote time)

       Input Timestamp is     hex-timestamp  ctime string
	      When the ntp response was received by us.  (local time)

       hostname: delay:time offset:time
	      The summary of the results of the query, giving the hostname of the responding clock (from the command line), the round-trip  delay,
	      and the offset between the two clocks (assuming symmetric round-trip times).

BUGS

       Using ntp with the current host will show inaccurate results.

       Probably a few others.  Report bugs to Louis A. Mamokos (louie@trantor.umd.edu).

SEE ALSO

       RFC-???? Network Time Protocol(1), Dave Mills and ...
       ntpd(8), ntpdc(8)

								   30 July 1988 							    NTP(8)