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ntptrace (8)
  • ntptrace (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • >> ntptrace (8) ( FreeBSD man: Команды системного администрирования )
  • ntptrace (8) ( Linux man: Команды системного администрирования )

  • BSD mandoc
     

    NAME

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

    SYNOPSIS

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

    DESCRIPTION

    The 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 ``localhost''

    Here is an example of the output from :

    % 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 ; 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.

    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.

     

    SEE ALSO

    ntpd(8), ntpdc(8)
    D L Mills Network Time Protocol (Version 3) RFC1305
     

    BUGS

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


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    SEE ALSO
    BUGS


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