author | Mike Sullivan <Mike.Sullivan@Oracle.COM> |
Thu, 05 Nov 2015 15:56:49 -0800 | |
changeset 5068 | 04572323827e |
parent 5007 | 0052258cbb9d |
permissions | -rw-r--r-- |
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'\" te |
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.\" CDDL HEADER START |
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.\" |
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.\" The contents of this file are subject to the terms of the |
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.\" Common Development and Distribution License (the "License"). |
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.\" You may not use this file except in compliance with the License. |
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.\" |
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.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE |
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.\" or http://www.opensolaris.org/os/licensing. |
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.\" See the License for the specific language governing permissions |
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.\" and limitations under the License. |
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.\" |
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.\" When distributing Covered Code, include this CDDL HEADER in each |
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.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE. |
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.\" If applicable, add the following below this CDDL HEADER, with the |
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.\" fields enclosed by brackets "[]" replaced with your own identifying |
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.\" information: Portions Copyright [yyyy] [name of copyright owner] |
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.\" |
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.\" CDDL HEADER END |
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.\" |
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.\" Copyright (c) 2009, 2015, Oracle and/or its affiliates. All rights reserved. |
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.\" |
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.TH "ntptrace" "8" "" "" "System Administration Commands" |
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.SH NAME |
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ntptrace \- trace a chain of NTP hosts back to their master time source |
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.SH SYNOPSIS |
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.LP |
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.nf |
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\fB/usr/sbin/ntptrace\fR [\fB-n\fR] [\fB-m\fR \fImaxhosts\fR] [\fIserver\fR] |
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.fi |
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.SH DESCRIPTION |
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.LP |
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\fBntptrace\fR determines from where a given Network Time Protocol (\fBNTP\fR) server gets its time, and follows the chain of \fBNTP\fR servers back to their master time source. If given no arguments, it starts with \fIlocalhost\fR. |
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.SH OPTIONS |
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.LP |
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The following options are supported: |
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.sp |
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.ne 2 |
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.mk |
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.na |
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\fB\fB-n\fR\fR |
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.ad |
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.RS 14n |
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.rt |
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Turns off the printing of host names; instead, host IP addresses are given. |
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.RE |
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.sp |
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.ne 2 |
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.mk |
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.na |
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\fB\fB-m\fR \fImaxhosts\fR\fR |
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.ad |
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.RS 14n |
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.rt |
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Sets the maximum number of levels up the chain that will be followed. |
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.RE |
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.SH EXAMPLES |
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.LP |
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\fBExample 1 \fRSample Output From the \fBntptrace\fR Command |
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.LP |
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The following example shows the output from the \fBntptrace\fR command: |
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.sp |
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.in +2 |
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.nf |
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% \fBntptrace\fR |
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localhost: stratum 4, offset 0.0019529, synch distance 0.144135 |
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server2.bozo.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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.in -2 |
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.sp |
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.LP |
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On each line, the fields are (left to right): |
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.RS +4 |
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.TP |
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.ie t \(bu |
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.el o |
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The server's host name |
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.RE |
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.RS +4 |
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.TP |
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.ie t \(bu |
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.el o |
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The server's stratum |
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.RE |
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.RS +4 |
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.TP |
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.ie t \(bu |
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.el o |
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The time offset between that server and the local host (as measured by \fBntptrace\fR; this is why it is not always zero for \fIlocalhost\fR) |
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.RE |
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.RS +4 |
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.TP |
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.ie t \(bu |
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.el o |
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The host's synchronization distance |
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.RE |
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.RS +4 |
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.TP |
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.ie t \(bu |
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.el o |
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The reference clock \fBID\fR (only for stratum-1 servers) |
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.RE |
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.LP |
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All times are given in seconds. Synchronization distance is a measure of the goodness of the clock's time. |
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.SH SEE ALSO |
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.LP |
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\fBntpq\fR(8), \fBntpd\fR(8), \fBntpdc\fR(8), \fBattributes\fR(7)) |
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