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ntptrace(8)


NAME

  ntptrace - Traces a chain of NTP hosts back to their master time source


SYNOPSIS

  /usr/sbin/ntptrace [-dnv] [-r retries] [-t timeout] [server]


OPTIONS

  -d  Turns on some debugging output.

  -n  Turns off the printing of host names; instead, host IP addresses are
      given.  This may be necessary 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.


DESCRIPTION

  The ntptrace command 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.

  The following is an example of the output from ntptrace:

       % ntptrace
       localhost: stratum 4, offset 0.0019529, synch distance 0.144135
       server2.bozo.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's
  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's
  synchronization distance, and (only for stratum-1 servers) the reference
  clock ID.  All times are given in seconds. (Synchronization distance is a
  measure of the goodness of the clock's time.)


SEE ALSO

  Commands: xntpd(8), xntpdc(8)

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