62 lines
1.9 KiB
Groff
62 lines
1.9 KiB
Groff
.\" $NetBSD: ntptrace.8,v 1.2 1997/04/20 21:53:23 christos Exp $
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.\" Converted from HTML to mandoc by Christos Zoulas <christos@netbsd.org>
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.\"
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.Dd April 17, 1997
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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
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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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.Ar server
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.Sh DESCRIPTION
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.Nm
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determines where a given Network Time Protocol
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(NTP) server gets its time from, and follows the chain of NTP servers
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back to 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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.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 0.00192, synch distance 0.011, 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
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stratum, the time offset between that host and the local host (as
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measured by
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.Nm
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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 distance, and (only
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for stratum-1 servers) the reference clock ID. All times are given in
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seconds. Note that the stratum is the server hop count to the primary
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source, while the synchronization distance is the estimated error
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relative to the primary source. These terms are precisely defined in
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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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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
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given. 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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.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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.Sh AUTHOR
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David L. Mills (mills@udel.edu)
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