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Wed Mar 17 00:39:23 2021 UTC (3 years, 7 months ago) by misho
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mpd 5.9

1: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> 2: <HTML> 3: <HEAD> 4: <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> 5: <TITLE>Compression (CCP) layer</TITLE> 6: </HEAD> 7: <BODY text="#000000" bgcolor="#ffffff"> 8: 9: <A HREF="mpd.html">Mpd 5.9 User Manual</A> 10: : <A HREF="mpd17.html">Configuring Mpd</A> 11: : Compression (CCP) layer  12: Previous: <A HREF="mpd23.html">Encryption (ECP) layer</A>  13: Next: <A HREF="mpd25.html">MPPC protocol</A> 14: 15: 16: <HR NOSHADE> 17: <H2><A NAME="24"></A>4.6. Compression (CCP) layer<A NAME="compression"></A></H2> 18: 19: This chapter describes commands that configure the Compression Control 20: Protocol (CCP) layer. All of these commands apply to the currently 21: active bundle. 22: 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. 25:  26: <dl> 27: 28: <dt><code>set ccp accept option ... </code><dd> 29: <dt><code>set ccp deny option ... </code><dd> 30: <dt><code>set ccp enable option ... </code><dd> 31: <dt><code>set ccp disable option ... </code><dd> 32: <dt><code>set ccp yes option ... </code><dd> 33: <dt><code>set ccp no option ... </code><dd> 34: 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>disable</code> and <code>deny</code>. 37: The <code>enable</code> and <code>disable</code> commands determine 38: whether we desire the corresponding option on received data. 39: The <code>accept</code> and <code>deny</code> commands determine 40: whether we will allow the peer to request the corresponding option 41: (which we must enable on our transmitted data). 42: 43: The <code>yes</code> command is the same as 44: <code>enable</code> and <code>accept</code>. 45: The <code>no</code> command is the same as 46: <code>disable</code> and <code>deny</code>. 47: 48: </dl> 49:  50: 51: The options available at the CCP layer are listed below. 52:  53: <dl> 54: 55: <dt><code>pred1</code><dd>This option enables Predictor-1 (RFC 1978) compression. 56: Predictor-1 compression is much faster then Deflate. 57: 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. 61: The default is disable. 62: 63: <dt><code>deflate</code><dd>This option enables Deflate (RFC 1979) compression. 64: Deflate compression usually gives better compression ratio then Predictor-1. 65: This option requires ng_deflate Netgraph node type, which is present 66: since FreeBSD 6.2-STABLE of 2007-01-28. 67: The default is disable. 68: 69: <dt><code>mppc</code><dd>This option enables MPPC compression/encryption subprotocol. 70: For details see 71: <A HREF="mpd25.html#mppc">the MPPC protocol chapter</A>. 72: The default is disable. 73: 74: </dl> 75:  76: <H3>4.6.1. <A HREF="mpd25.html#25">MPPC protocol</A></H3> 77: <HR NOSHADE> 78: <A HREF="mpd.html">Mpd 5.9 User Manual</A> 79: : <A HREF="mpd17.html">Configuring Mpd</A> 80: : Compression (CCP) layer  81: Previous: <A HREF="mpd23.html">Encryption (ECP) layer</A>  82: Next: <A HREF="mpd25.html">MPPC protocol</A> 83: 84: 85: 86: </BODY> 87: </HTML>