105 lines
2.3 KiB
Groff
105 lines
2.3 KiB
Groff
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''' $Header
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'''
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.de Sh
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.br
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.ne 5
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.PP
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\fB\\$1\fR
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.PP
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..
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.de Sp
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.if t .sp .5v
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.if n .sp
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..
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.de Ip
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.br
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.ie \\n.$>=3 .ne \\$3
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.el .ne 3
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.IP "\\$1" \\$2
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..
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'''
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''' Set up \*(-- to give an unbreakable dash;
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''' string Tr holds user defined translation string.
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''' Bell System Logo is used as a dummy character.
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'''
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.tr \(bs-|\(bv\*(Tr
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.ie n \{\
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.ds -- \(bs-
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.if (\n(.H=4u)&(1m=24u) .ds -- \(bs\h'-12u'\(bs\h'-12u'-\" diablo 10 pitch
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.if (\n(.H=4u)&(1m=20u) .ds -- \(bs\h'-12u'\(bs\h'-8u'-\" diablo 12 pitch
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.ds L" ""
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.ds R" ""
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.ds L' '
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.ds R' '
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'br\}
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.el\{\
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.ds -- \(em\|
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.tr \*(Tr
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.ds L" ``
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.ds R" ''
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.ds L' `
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.ds R' '
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'br\}
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.TH NTPTRACE 8 LOCAL
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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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.B ntptrace
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[
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.B -vdn
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] [
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.B -r
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.I retries
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] [
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.B -t
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.I timeout
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] [
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.I server
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]
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.SH DESCRIPTION
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.I Ntptrace
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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 ``localhost.''
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.PP
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Here is an example of the output from
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.IR ntptrace :
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.RS 2
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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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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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.RE
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On each line, the fields are (left to right): the host name, the
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host's 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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.IR ntptrace ;
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this is why it is not always zero for ``localhost''),
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the host's ``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. (Synchronization distance is a measure of the
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goodness of the clock's time.)
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.SH OPTIONS
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.IP "\-d" 5
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Turns on some debugging output.
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.IP "\-n" 5
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Turns 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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.IP "\-r retries" 5
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Sets the number of retransmission attempts for each host; default = 5.
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.IP "\-t timeout" 5
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Sets the retransmission timeout (in seconds); default = 2.
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.IP "\-v" 5
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Prints verbose information about the NTP servers.
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.SH SEE ALSO
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xntpd(8), xntpdc(8)
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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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