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NTPTRACE(8)                 System Manager's Manual                NTPTRACE(8)

     ntptrace -- trace a chain of NTP servers back to the primary source

     ntptrace [-vdn] [-r retries] [-t timeout] [server]

     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
     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 relative to the primary source. These
     terms are precisely defined in RFC-1305.

     -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.

     David L. Mills (millsATudel.edu)

     This program makes no attempt to improve accuracy by doing multiple

NetBSD 6.1.5                    March 29, 2000                    NetBSD 6.1.5