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NTPTRACE(8)               BSD 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]

     The ntptrace utility 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

     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 stra-
     tum is the server hop count to the primary source, while the synchroniza-
     tion distance is the estimated error relative to the primary source.
     These terms are precisely defined in RFC 1305.

     The following options are available:

     -d      Turn on some debugging output.

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

     -r retries
             Set the number of retransmission attempts for each host; the
             default is 5.

     -t timeout
             Set the retransmission timeout (in seconds); the default is 2.

     -v      Print verbose information about the NTP servers.

     ntpd(8), ntpdc(8)

     D L Mills, Network Time Protocol (Version 3), RFC1305.

     This program makes no attempt to improve accuracy by doing multiple sam-

BSD                             January 6, 2000                            BSD