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1.1.1.4 ! misho       9: <A HREF="mpd.html"><EM>Mpd 5.9 User Manual</EM></A>
1.1       misho      10:  <b>:</b> <A HREF="mpd17.html"><EM>Configuring Mpd</EM></A>
                     11:  <b>:</b> <EM>Compression (CCP) layer</EM><BR>
                     12: <b>Previous:</b> <A HREF="mpd23.html"><EM>Encryption (ECP) layer</EM></A><BR>
                     13: <b>Next:</b> <A HREF="mpd25.html"><EM>MPPC protocol</EM></A>
                     14: 
                     15: 
                     16: <HR NOSHADE>
                     17:   <H2><A NAME="24"></A>4.6. Compression (CCP) layer<A NAME="compression"></A></H2>
                     18: 
                     19: <p>This chapter describes commands that configure the Compression Control
                     20: Protocol (CCP) layer. All of these commands apply to the currently
                     21: active bundle.</p>
                     22: <p>To use CCP you should enable compression at the bundle level.
                     23: To allow compression to be negotiated you should enable here some of 
                     24: compression protocols.</p>
                     25: <p>
                     26: <dl>
                     27: 
                     28: <dt><b><code>set ccp accept <em>option ...</em> </code></b><dd>
                     29: <dt><b><code>set ccp deny <em>option ...</em> </code></b><dd>
                     30: <dt><b><code>set ccp enable <em>option ...</em> </code></b><dd>
                     31: <dt><b><code>set ccp disable <em>option ...</em> </code></b><dd>
                     32: <dt><b><code>set ccp yes <em>option ...</em> </code></b><dd>
                     33: <dt><b><code>set ccp no <em>option ...</em> </code></b><dd>
                     34: <p>These commands configure various CCP options. Each direction of
                     35: traffic (transmit and receive) is independent from the other.
                     36: All options default to <code><b>disable</b></code> and <code><b>deny</b></code>.</p>
                     37: <p>The <code><b>enable</b></code> and <code><b>disable</b></code> commands determine
                     38: whether we desire the corresponding option on received data.
                     39: The <code><b>accept</b></code> and <code><b>deny</b></code> commands determine
                     40: whether we will allow the peer to request the corresponding option
                     41: (which we must enable on our transmitted data).</p>
                     42: 
                     43: <p>The <b><code>yes</code></b> command is the same as
                     44: <code><b>enable</b></code> and <code><b>accept</b></code>.
                     45: The <b><code>no</code></b> command is the same as
                     46: <code><b>disable</b></code> and <code><b>deny</b></code>.</p>
                     47: 
                     48: </dl>
                     49: </p>
                     50: 
                     51: <p>The options available at the CCP layer are listed below.</p>
                     52: <p>
                     53: <dl>
                     54: 
                     55: <dt><b><code>pred1</code></b><dd><p>This option enables Predictor-1 (RFC 1978) compression.
                     56: Predictor-1 compression is much faster then Deflate.</p>
                     57: <p>This option requires ng_pred1 Netgraph node type, which is present
                     58: since FreeBSD 6.2-STABLE of 2007-01-28.
                     59: If there is no ng_pred1 in system, this algorithm is supported
                     60: in user-level, but will consume more CPU power.</p>
                     61: <p>The default is disable.</p>
                     62: 
                     63: <dt><b><code>deflate</code></b><dd><p>This option enables Deflate (RFC 1979) compression.
                     64: Deflate compression usually gives better compression ratio then Predictor-1.</p>
                     65: <p>This option requires ng_deflate Netgraph node type, which is present
                     66: since FreeBSD 6.2-STABLE of 2007-01-28.</p>
                     67: <p>The default is disable.</p>
                     68: 
                     69: <dt><b><code>mppc</code></b><dd><p>This option enables MPPC compression/encryption subprotocol.
                     70: For details see 
1.1.1.4 ! misho      71: <A HREF="mpd25.html#mppc">the MPPC protocol chapter</A>.</p>
1.1       misho      72: <p>The default is disable.</p>
                     73: 
                     74: </dl>
                     75: </p>
                     76: <H3>4.6.1. <A HREF="mpd25.html#25">MPPC protocol</A></H3>
                     77:  <HR NOSHADE>
1.1.1.4 ! misho      78: <A HREF="mpd.html"><EM>Mpd 5.9 User Manual</EM></A>
1.1       misho      79:  <b>:</b> <A HREF="mpd17.html"><EM>Configuring Mpd</EM></A>
                     80:  <b>:</b> <EM>Compression (CCP) layer</EM><BR>
                     81: <b>Previous:</b> <A HREF="mpd23.html"><EM>Encryption (ECP) layer</EM></A><BR>
                     82: <b>Next:</b> <A HREF="mpd25.html"><EM>MPPC protocol</EM></A>
                     83: 
                     84: 
                     85: 
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