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doc: update description of offline command
Reachability and online/offline mode has no effect on source selection since version 2.0.
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@@ -4044,8 +4044,8 @@ next measurement has been made.
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@node offline command
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@subsubsection offline
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The @code{offline} command is used to warn @code{chronyd} that the network
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connection to a particular host or hosts is about to be lost. It should
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be used on computers with a dial-up or similar connection to their time
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connection to a particular host or hosts is about to be lost. It can
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be used on computers with intermittent connection to their time
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sources, to warn @code{chronyd} that the connection is about to be broken.
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An example of how to use @code{offline} in this case is shown in
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@@ -4082,14 +4082,6 @@ achieve this. The situation is shown in the figure below.
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@end example
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If the source to which @code{chronyd} is currently synchronised is indicated
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offline in this way, @code{chronyd} will continue to treat it as the
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synchronisation source. If the network connection were broken without
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the @code{offline} command being used, @code{chronyd} would assume that the
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source had failed and would attempt to pick another synchronisation
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source.
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There are four forms of the @code{offline} command. The first form is a
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wildcard, meaning all sources. The second form allows an IP address mask
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and a masked address to be specified. The third form uses the CIDR
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