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Wed Mar 17 00:39:23 2021 UTC (3 years, 9 months ago) by misho
Branches: mpd, MAIN
CVS tags: v5_9p16, v5_9, HEAD
mpd 5.9

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<A HREF="mpd.html"><EM>Mpd 5.9 User Manual</EM></A>
 <b>:</b> <A HREF="mpd17.html"><EM>Configuring Mpd</EM></A>
 <b>:</b> <A HREF="mpd24.html"><EM>Compression (CCP) layer</EM></A>
 <b>:</b> <EM>MPPC protocol</EM><BR>
<b>Previous:</b> <A HREF="mpd24.html"><EM>Compression (CCP) layer</EM></A><BR>
<b>Next:</b> <A HREF="mpd26.html"><EM>IPCP layer</EM></A>


<HR NOSHADE>
  <H2><A NAME="25"></A>4.6.1. MPPC protocol<A NAME="mppc"></A></H2>
<p>  
Mpd implements Microsoft Point-to-point compression (MPPC)
CCP subprotol. To enable it, 'mppc' option should be enabled at the CCP layer.</p>
<p>MPPC CCP subprotocol consists of MPPC compression and MPPE encryption parts.
To make MPPC CCP actually do something you should enable some of them using
options below.</p>
<p>
<dl>

<dt><b><code>set mppc accept <em>option ...</em> </code></b><dd>
<dt><b><code>set mppc deny <em>option ...</em> </code></b><dd>
<dt><b><code>set mppc enable <em>option ...</em> </code></b><dd>
<dt><b><code>set mppc disable <em>option ...</em> </code></b><dd>
<dt><b><code>set mppc yes <em>option ...</em> </code></b><dd>
<dt><b><code>set mppc no <em>option ...</em> </code></b><dd>
<p>These commands configure various MPPC options.</p>

<dt><b><code>compress</code></b><dd><p>Enables MPPC compression. This is the only compression method supported by 
Microsoft Windows RAS.</p>
<p>Note: This option requires ng_mppc node to be built with compression support,
which is disabled by default, requiring external compressor code.
Open-source implementation of this code, based on RFC2118, could be found
at http://mavhome.dp.ua/MPPC/. But MPPC compression algorithm itself covered
by US patent, so you may need to contact Hi/Fn Inc. to obtain their proprietary
implementation.
If kernel support is not detected, compression will not be negotiated.
Use 'show version' command to get actual status.</p>
<p>The default is disable.</p>

<dt><b><code>e40</code></b><dd><p>Enables 40-bit MPPE encryption.</p>
<p>The default is disable.</p>

<dt><b><code>e56</code></b><dd><p>Enables 56-bit MPPE encryption.</p>
<p>The default is disable.</p>

<dt><b><code>e128</code></b><dd><p>Enables 128-bit MPPE encryption.</p>
<p>Note: in order for MPPE encryption to work, MS-CHAPv1 or MS-CHAPv2 auth
is mandatory, because the MPPE keys are generated using the authentication
results. If MS-CHAP auth is not used by link, encryption will not be negotiated.</p>
<p>The default is disable.</p>

<dt><b><code>stateless</code></b><dd><p>Enables stateless mode. This mode requires more CPU time and is somewhat
less secure, but allows faster recovery in the face of lost packets.</p>
<p>The default is disable.</p>

<dt><b><code>policy</code></b><dd><p>If enabled, Mpd uses the MPPE-Types and MPPE-Policy info from the authentication 
backend.</p>
<p>The default is disable.</p>

</dl>
</p>
 <HR NOSHADE>
<A HREF="mpd.html"><EM>Mpd 5.9 User Manual</EM></A>
 <b>:</b> <A HREF="mpd17.html"><EM>Configuring Mpd</EM></A>
 <b>:</b> <A HREF="mpd24.html"><EM>Compression (CCP) layer</EM></A>
 <b>:</b> <EM>MPPC protocol</EM><BR>
<b>Previous:</b> <A HREF="mpd24.html"><EM>Compression (CCP) layer</EM></A><BR>
<b>Next:</b> <A HREF="mpd26.html"><EM>IPCP layer</EM></A>



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