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<title>ProFTPD module mod_qos</title>
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<h2><b>ProFTPD module <code>mod_qos</code></b></h2>
</center>
<hr><br>

<p>
The <code>mod_qos</code> module can be used to set the Differentiated
Services field (<a href="http://www.faqs.org/rfcs/rfc2474.html">RFC2474</a>)
of IP packet headers.  This can dramatically aid in the handling of these
packets in the network, depending on the network QoS configuration.

<p>
This module is contained in the <code>mod_qos</code> file for
ProFTPD 1.3.<i>x</i>, and is not compiled by default.  Installation
instructions are discussed <a href="#Installation">here</a>.

<p>
The most current version of <code>mod_qos</code> is distributed with
the ProFTPD source code.

<h2>Directives</h2>
<ul>
  <li><a href="#QoSOptions">QoSOptions</a>
</ul>

<hr>
<h3><a name="QoSOptions">QoSOptions</a></h3>
<strong>Syntax:</strong> QoSOptions <em>&quot;ctrlqos&quot; value|&quot;dataqos&quot; value</em><br>
<strong>Default:</strong> <em>None</em><br>
<strong>Context:</strong> server config, <code>&lt;VirtualHost&gt;</code><br>
<strong>Module:</strong> mod_qos<br>
<strong>Compatibility:</strong> 1.3.4rc1 and later

<p>
The <code>QoSOptions</code> directive configures the QoS bits to use for
the control and/or data connections.

<p>
The possible values to use are:
<ul>
  <li>cs0
  <li>cs1
  <li>cs2
  <li>cs3
  <li>cs4
  <li>cs5
  <li>cs6
  <li>cs7
  <li>af11
  <li>af12
  <li>af13
  <li>af21
  <li>af22
  <li>af23
  <li>af31
  <li>af32
  <li>af33
  <li>af41
  <li>af42
  <li>af43
</ul>
See <a href="http://www.faqs.org/rfcs/rfc2474.html">RFC2474</a> for a better
discussion of these values.

<p>
<b>Note</b> that while the following values are also supported, their use is
deprecated, and can have adverse effects on TCP congestion control:
<ul>
  <li>lowcost
  <li>lowdelay
  <li>mincost
  <li>reliability
  <li>throughput
</ul>

<p>
<hr>
<h2><a name="Installation">Installation</a></h2>
For including <code>mod_qos</code> as a staticly linked module in your
<code>proftpd</code>, use:
<pre>
  $ ./configure --with-modules=mod_qos
</pre>
Alternatively, <code>mod_qos</code> could be built as a DSO module:
<pre>
  $ ./configure --enable-dso --with-shared=mod_qos
</pre>
Then follow the usual steps:
<pre>
  $ make
  $ make install
</pre>

<p>
Alternatively, if your <code>proftpd</code> was compiled with DSO support, you
can use the <code>prxs</code> tool to build <code>mod_qos</code> as a shared
module:
<pre>
  $ prxs -c -i -d mod_qos.c
</pre>

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