ntptrace man page on FreeBSD

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

NAME
     ntptrace — trace a chain of NTP servers back to the primary source

SYNOPSIS
     ntptrace [-vdn] [-r retries] [-t timeout] [server]

DESCRIPTION
     The ntptrace utility determines where a given Network Time Protocol (NTP)
     server gets its time from, and follows the chain of NTP servers back to
     their master time source.	If given no arguments, it starts with
     “localhost”.

     Here is an example of the output from ntptrace:

     % ntptrace
     localhost: stratum 4, offset 0.0019529, synch distance 0.144135
     server2ozo.com: stratum 2, offset 0.0124263, synch distance 0.115784
     usndh.edu: stratum 1, offset 0.0019298, synch distance 0.011993, refid 'WWVB'

     On each line, the fields are (left to right): the host name, the host
     stratum, the time offset between that host and the local host (as mea‐
     sured by ntptrace; this is why it is not always zero for “localhost”),
     the host synchronization distance, and (only for stratum-1 servers) the
     reference clock ID.  All times are given in seconds.  Note that the stra‐
     tum is the server hop count to the primary source, while the synchroniza‐
     tion distance is the estimated error relative to the primary source.
     These terms are precisely defined in RFC 1305.

     The following options are available:

     -d	     Turn on some debugging output.

     -n	     Turn off the printing of host names; instead, host IP addresses
	     are given.	 This may be necessary if a nameserver is down.

     -r retries
	     Set the number of retransmission attempts for each host; the
	     default is 5.

     -t timeout
	     Set the retransmission timeout (in seconds); the default is 2.

     -v	     Print verbose information about the NTP servers.

SEE ALSO
     ntpd(8), ntpdc(8)

     D L Mills, Network Time Protocol (Version 3), RFC1305.

BUGS
     This program makes no attempt to improve accuracy by doing multiple sam‐
     ples.

BSD				January 6, 2000				   BSD
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