1@node ntptrace Invocation 2@section Invoking ntptrace 3@pindex ntptrace 4@cindex Trace peers of an NTP server 5@ignore 6# 7# EDIT THIS FILE WITH CAUTION (invoke-ntptrace.texi) 8# 9# It has been AutoGen-ed February 27, 2018 at 10:50:11 AM by AutoGen 5.18.5 10# From the definitions ntptrace-opts.def 11# and the template file agtexi-cmd.tpl 12@end ignore 13 14@code{ntptrace} is a perl script that uses the ntpq utility program to follow 15the chain of NTP servers from a given host back to the primary time source. For 16ntptrace to work properly, each of these servers must implement the NTP Control 17and Monitoring Protocol specified in RFC 1305 and enable NTP Mode 6 packets. 18 19If given no arguments, ntptrace starts with localhost. Here is an example of 20the output from ntptrace: 21 22@example 23% ntptrace localhost: stratum 4, offset 0.0019529, synch distance 0.144135 24server2ozo.com: stratum 2, offset 0.0124263, synch distance 0.115784 usndh.edu: 25stratum 1, offset 0.0019298, synch distance 0.011993, refid 'WWVB' 26@end example 27 28On each line, the fields are (left to right): the host name, the host stratum, 29the time offset between that host and the local host (as measured by 30@code{ntptrace}; this is why it is not always zero for "localhost"), the host 31synchronization distance, and (only for stratum-1 servers) the reference clock 32ID. All times are given in seconds. Note that the stratum is the server hop 33count to the primary source, while the synchronization distance is the 34estimated error relative to the primary source. These terms are precisely 35defined in RFC-1305. 36 37 38This section was generated by @strong{AutoGen}, 39using the @code{agtexi-cmd} template and the option descriptions for the @code{ntptrace} program. 40 41@menu 42* ntptrace usage:: ntptrace help/usage (@option{--help}) 43* ntptrace numeric:: numeric option (-n) 44* ntptrace max-hosts:: max-hosts option (-m) 45* ntptrace host:: host option (-r) 46* ntptrace exit status:: exit status 47@end menu 48 49@node ntptrace usage 50@subsection ntptrace help/usage (@option{--help}) 51@cindex ntptrace help 52 53This is the automatically generated usage text for ntptrace. 54 55The text printed is the same whether selected with the @code{help} option 56(@option{--help}) or the @code{more-help} option (@option{--more-help}). @code{more-help} will print 57the usage text by passing it through a pager program. 58@code{more-help} is disabled on platforms without a working 59@code{fork(2)} function. The @code{PAGER} environment variable is 60used to select the program, defaulting to @file{more}. Both will exit 61with a status code of 0. 62 63@exampleindent 0 64@example 65ntptrace - Trace peers of an NTP server - Ver. 4.2.8p11 66USAGE: ntptrace [ -<flag> [<val>] | --<name>[@{=| @}<val>] ]... [host] 67 68 -n, --numeric Print IP addresses instead of hostnames 69 -m, --max-hosts=num Maximum number of peers to trace 70 -r, --host=str Single remote host 71 -?, --help Display usage information and exit 72 --more-help Pass the extended usage text through a pager 73 74Options are specified by doubled hyphens and their name or by a single 75hyphen and the flag character. 76@end example 77@exampleindent 4 78 79@node ntptrace numeric 80@subsection numeric option (-n) 81@cindex ntptrace-numeric 82 83This is the ``print ip addresses instead of hostnames'' option. 84Output hosts as dotted-quad numeric format rather than converting to 85the canonical host names. 86@node ntptrace max-hosts 87@subsection max-hosts option (-m) 88@cindex ntptrace-max-hosts 89 90This is the ``maximum number of peers to trace'' option. 91This option takes a number argument. 92This option has no @samp{doc} documentation. 93@node ntptrace host 94@subsection host option (-r) 95@cindex ntptrace-host 96 97This is the ``single remote host'' option. 98This option takes a string argument. 99This option has no @samp{doc} documentation. 100@node ntptrace exit status 101@subsection ntptrace exit status 102 103One of the following exit values will be returned: 104@table @samp 105@item 0 (EXIT_SUCCESS) 106Successful program execution. 107@item 1 (EXIT_FAILURE) 108The operation failed or the command syntax was not valid. 109@end table 110