6d8a85eb29
Those pages which have not been transcribed are referenced as gracefully as possible. There is no perfect section for the ntp_* files, which document configuration options for the NTP suite, so I'm putting them in the same section as the pages for the utilities themselves.
74 lines
1.9 KiB
Groff
74 lines
1.9 KiB
Groff
.\"
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.\" $FreeBSD$
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.\"
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.Dd January 6, 2000
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.Dt NTPTRACE 8
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.Os
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.Sh NAME
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.Nm ntptrace
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.Nd trace a chain of NTP servers back to the primary source
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.Sh SYNOPSIS
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.Nm ntptrace
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.Op Fl vdn
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.Op Fl r Ar retries
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.Op Fl t Ar timeout
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.Op Ar server
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.Sh DESCRIPTION
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.Nm
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determines where a given Network Time Protocol (NTP) server gets
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its time from, and follows the chain of NTP servers back to their
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master time source.
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If given no arguments, it starts with
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.Dq localhost .
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.Pp
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Here is an example of the output from
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.Nm Ns :
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.Bd -literal
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% ntptrace
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localhost: stratum 4, offset 0.0019529, synch distance 0.144135
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server2ozo.com: stratum 2, offset 0.0124263, synch distance 0.115784
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usndh.edu: stratum 1, offset 0.0019298, synch distance 0.011993, refid 'WWVB'
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.Ed
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.Pp
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On each line, the fields are (left to right): the host name, the
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host stratum,
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the time offset between that host and the local host
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(as measured by
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.Nm Ns ;
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this is why it is not always zero for
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.Dq localhost ) ,
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the host
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synchronization distance ,
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and (only for stratum-1 servers) the reference clock ID. All times
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are given in seconds.
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Note that the stratum is the server hop count to the primary source,
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while the synchronization distance is the estimated error
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relative to the primary source.
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These terms are precisely defined in RFC 1305.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl d
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Turn on some debugging output.
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.It Fl n
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Turn off the printing of host names; instead, host IP addresses
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are given. This may be necessary if a nameserver is down.
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.It Fl r Ar retries
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Set the number of retransmission attempts for each host; the default is 5.
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.It Fl t Ar timeout
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Set the retransmission timeout (in seconds); the default is 2.
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.It Fl v
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Print verbose information about the NTP servers.
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.El
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.Sh SEE ALSO
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.Xr xntpd 8 ,
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.Xr xntpdc 8
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.Rs
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.%A D L Mills
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.%T Network Time Protocol (Version 3)
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.%O RFC1305
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.Re
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.Sh BUGS
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This program makes no attempt to improve accuracy by doing multiple
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samples.
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