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<th colspan="3" align="center">LPRng-HOWTO: 1 Apr 2002
(For LPRng-3.8.10)</th>
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<h1 class="SECT1"><a name="FORCELOCALHOST">5.8. Force
Connection to Localhost</a></h1>
<p>Options used:</p>
<ul>
<li>
<p><tt class="LITERAL">force_localhost</tt> FLAG <i
class="EMPHASIS">force localhost to be remote
host</i></p>
</li>
</ul>
<br>
<br>
<p>The legacy BSD print spooler required an <b class=
"APPLICATION">lpd</b> print server to be running on each
host. During the initial stages of development and
deployment, the default <b class="APPLICATION">LPRng</b>
configuration and deployment was to always allow <i class=
"EMPHASIS">lightweight</i> operation, that is, clients would
always connect to the remote host specified in the
printcap.</p>
<p>While this default was appropriate for experienced system
administrators, novice administrators or those who had
already configured print spooling systems and simply wanted
to upgrade found themselves confused by this change. This
problem resulted in over 700 postings to the <b class=
"APPLICATION">LPRng</b> mailing list in a five year
period.</p>
<p>This problem was solved by providing a <tt class=
"LITERAL">force_localhost</tt> option in the configuration,
and setting the default value to <tt class="LITERAL">1</tt>
or <span class="ACRONYM">TRUE</span>. When this option is
<span class="ACRONYM">TRUE</span>, then all <b class=
"APPLICATION">LPRng</b> clients will connect to the server on
the localhost, <i class="EMPHASIS">unless</i> they use the
<tt class="COMMAND">lpr -Pserver@host</tt> command line form.
If lightweight operation is wanted, the administrator can
either compile the <b class="APPLICATION">LPRng</b> software
with the appropriate value or can explicitly set the <tt
class="LITERAL">force_localhost@</tt> flag.</p>
<div class="INFORMALEXAMPLE">
<a name="AEN4143"></a>
<pre class="SCREEN">
# default:
lp:lp=lp@10.0.0.1:...
lpr -Plp ->
lp:lp=lp@localhost:...
lpr -Plp@10.0.0.1 ->
lp:lp=lp@10.0.0.1 (no other options)
lp:lp=lp@10.0.0.1:force_localhost@:...
lpr -Plp ->
lp:lp=lp@10.0.0.1:...
To disable at compile time:
configure --disable-force_localhost
</pre>
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