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

     ntptrace 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.

OPTIONS

     -d      Turns on some debugging output.

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

     -r retries
	     Sets the number of retransmission attempts for each host (default = 5).

     -t timeout
	     Sets the retransmission timeout (in seconds) (default = 2).

     -v      Prints verbose information about the NTP servers.

AUTHORS

     David L. Mills (mills@udel.edu)

BUGS

     This program makes no attempt to improve accuracy by doing multiple samples.

BSD
								  March 29, 2000							       BSD