ntptrace



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  stra-
       tum-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 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.


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 <mills@udel.edu>



ntp 4.1.1b-r5                                                      ntptrace(1)

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