osx man page for ntptrace

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 stratum is the server hop count to the primary source, while the syn-
     chronization 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 samples.

BSD
								  January 6, 2000							       BSD