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9: <A HREF="mpd.html"><EM>Mpd 5.9 User Manual</EM></A>
10: <b>:</b> <A HREF="mpd17.html"><EM>Configuring Mpd</EM></A>
11: <b>:</b> <A HREF="mpd24.html"><EM>Compression (CCP) layer</EM></A>
12: <b>:</b> <EM>MPPC protocol</EM><BR>
13: <b>Previous:</b> <A HREF="mpd24.html"><EM>Compression (CCP) layer</EM></A><BR>
14: <b>Next:</b> <A HREF="mpd26.html"><EM>IPCP layer</EM></A>
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18: <H2><A NAME="25"></A>4.6.1. MPPC protocol<A NAME="mppc"></A></H2>
19: <p>
20: Mpd implements Microsoft Point-to-point compression (MPPC)
21: CCP subprotol. To enable it, 'mppc' option should be enabled at the CCP layer.</p>
22: <p>MPPC CCP subprotocol consists of MPPC compression and MPPE encryption parts.
23: To make MPPC CCP actually do something you should enable some of them using
24: options below.</p>
25: <p>
26: <dl>
27:
28: <dt><b><code>set mppc accept <em>option ...</em> </code></b><dd>
29: <dt><b><code>set mppc deny <em>option ...</em> </code></b><dd>
30: <dt><b><code>set mppc enable <em>option ...</em> </code></b><dd>
31: <dt><b><code>set mppc disable <em>option ...</em> </code></b><dd>
32: <dt><b><code>set mppc yes <em>option ...</em> </code></b><dd>
33: <dt><b><code>set mppc no <em>option ...</em> </code></b><dd>
34: <p>These commands configure various MPPC options.</p>
35:
36: <dt><b><code>compress</code></b><dd><p>Enables MPPC compression. This is the only compression method supported by
37: Microsoft Windows RAS.</p>
38: <p>Note: This option requires ng_mppc node to be built with compression support,
39: which is disabled by default, requiring external compressor code.
40: Open-source implementation of this code, based on RFC2118, could be found
41: at http://mavhome.dp.ua/MPPC/. But MPPC compression algorithm itself covered
42: by US patent, so you may need to contact Hi/Fn Inc. to obtain their proprietary
43: implementation.
44: If kernel support is not detected, compression will not be negotiated.
45: Use 'show version' command to get actual status.</p>
46: <p>The default is disable.</p>
47:
48: <dt><b><code>e40</code></b><dd><p>Enables 40-bit MPPE encryption.</p>
49: <p>The default is disable.</p>
50:
51: <dt><b><code>e56</code></b><dd><p>Enables 56-bit MPPE encryption.</p>
52: <p>The default is disable.</p>
53:
54: <dt><b><code>e128</code></b><dd><p>Enables 128-bit MPPE encryption.</p>
55: <p>Note: in order for MPPE encryption to work, MS-CHAPv1 or MS-CHAPv2 auth
56: is mandatory, because the MPPE keys are generated using the authentication
57: results. If MS-CHAP auth is not used by link, encryption will not be negotiated.</p>
58: <p>The default is disable.</p>
59:
60: <dt><b><code>stateless</code></b><dd><p>Enables stateless mode. This mode requires more CPU time and is somewhat
61: less secure, but allows faster recovery in the face of lost packets.</p>
62: <p>The default is disable.</p>
63:
64: <dt><b><code>policy</code></b><dd><p>If enabled, Mpd uses the MPPE-Types and MPPE-Policy info from the authentication
65: backend.</p>
66: <p>The default is disable.</p>
67:
68: </dl>
69: </p>
70: <HR NOSHADE>
71: <A HREF="mpd.html"><EM>Mpd 5.9 User Manual</EM></A>
72: <b>:</b> <A HREF="mpd17.html"><EM>Configuring Mpd</EM></A>
73: <b>:</b> <A HREF="mpd24.html"><EM>Compression (CCP) layer</EM></A>
74: <b>:</b> <EM>MPPC protocol</EM><BR>
75: <b>Previous:</b> <A HREF="mpd24.html"><EM>Compression (CCP) layer</EM></A><BR>
76: <b>Next:</b> <A HREF="mpd26.html"><EM>IPCP layer</EM></A>
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