ntptrace(1)							  ntptrace(1)



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 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	 measured  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 synchronization distance is the estimated error rel-
       ative 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.

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


SEE ALSO
       Primary source of documentation: /usr/share/doc/ntp-*/ntptrace.html


AUTHOR
       David L. Mills 



ntp 4.1.1b-r5							  ntptrace(1)

UNIX/Linux commands referenced on this page:

1. time
2. host
3. clock
4. addresses