62 lines
1.9 KiB
Groff
62 lines
1.9 KiB
Groff
.\" $NetBSD: ntptrace.8,v 1.6 2002/02/02 01:27:52 wiz Exp $
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.\" Converted from HTML to mandoc by ntp-html2mdoc.pl
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.\"
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.Dd March 29, 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
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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 Fl server
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.Sh DESCRIPTION
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.Nm
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determines where a given Network Time Protocol (NTP)
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server gets its time from, and follows the chain of NTP servers back to
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their master time source. If given no arguments, it starts with
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.Pa localhost .
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Here is an example of the output from
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.Nm "" :
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.Pp
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.nf
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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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.fi
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.Pp
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On each line, the fields are (left to right): the host name, the host stratum,
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the time offset between that host and the local host (as measured by
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.Nm
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;
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this is why it is not always zero for
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.Pa localhost
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), the host synchronization
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distance, and (only for stratum-1 servers) the reference clock ID. All
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times are given in seconds. Note that the stratum is the server hop count
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to the primary source, while the synchronization distance is the estimated
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error relative to the primary source. These terms are precisely defined
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in RFC-1305.
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.Sh OPTIONS
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.Bl -tag -width indent
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.It Fl d
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Turns on some debugging output.
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.It Fl n
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Turns off the printing of host names; instead, host IP addresses are given.
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This may be useful if a nameserver is down.
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.It Fl r Ar retries
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Sets the number of retransmission attempts for each host (default = 5).
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.It Fl t Ar timeout
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Sets the retransmission timeout (in seconds) (default = 2).
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.It Fl v
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Prints verbose information about the NTP servers.
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.El
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.Sh AUTHORS
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David L. Mills (mills@udel.edu)
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.Sh BUGS
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This program makes no attempt to improve accuracy by doing multiple samples.
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