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        !             5: <TITLE>Netgraph device type commands</TITLE>
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        !             9: <A HREF="mpd.html"><EM>Mpd 5.6 User Manual</EM></A>
        !            10:  <b>:</b> <A HREF="mpd42.html"><EM>Device Types</EM></A>
        !            11:  <b>:</b> <EM>Netgraph device type commands</EM><BR>
        !            12: <b>Previous:</b> <A HREF="mpd43.html"><EM>Modem type commands</EM></A><BR>
        !            13: <b>Next:</b> <A HREF="mpd45.html"><EM>TCP device type commands</EM></A>
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        !            17:   <H2><A NAME="44"></A>5.2. Netgraph device type commands<A NAME="netgraph"></A></H2>
        !            18: <p>This chapter describes commands that are specific to netgraph type links.
        !            19: These commands apply to the currently active link, and are only
        !            20: valid if the currently active link has type <b>ng</b>.</p>
        !            21: <p>Note that this device type has no direct way to detect a physical layer
        !            22: disconnection (i.e., what would be analogous to loss of carrier detect)
        !            23: except by receiving a write error. One way to achieve this is to
        !            24: insure that when the physical layer goes down, the connection to
        !            25: the Netgraph hook is broken.</p>
        !            26: <p>
        !            27: <dl>
        !            28: 
        !            29: <dt><b><code>set ng node <em>nodepath</em></code></b><dd>
        !            30: <dt><b><code>set ng hook <em>hook</em></code></b><dd><p>These commands configure which Netgraph node, and which hook on that
        !            31: node, mpd is supposed to connect to. The node is found via the
        !            32: absolute Negraph address <code><em>nodepath</em></code> and must have
        !            33: a free hook named <code><em>hook</em></code>. Both of these commands
        !            34: are required.</p>
        !            35: <p>The hook should be connectable directly to a link hook of the
        !            36: <code>ng_ppp(3)</code> netgraph node type.  That is, it should be
        !            37: prepared to transmit and receive PPP frames starting with the
        !            38: address and control fields (unless compressed), followed by the
        !            39: PPP protocol number and information fields, but containing no
        !            40: checksum field.</p>
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        !            42: </dl>
        !            43: </p>
        !            44: 
        !            45: 
        !            46: 
        !            47:  <HR NOSHADE>
        !            48: <A HREF="mpd.html"><EM>Mpd 5.6 User Manual</EM></A>
        !            49:  <b>:</b> <A HREF="mpd42.html"><EM>Device Types</EM></A>
        !            50:  <b>:</b> <EM>Netgraph device type commands</EM><BR>
        !            51: <b>Previous:</b> <A HREF="mpd43.html"><EM>Modem type commands</EM></A><BR>
        !            52: <b>Next:</b> <A HREF="mpd45.html"><EM>TCP device type commands</EM></A>
        !            53: 
        !            54: 
        !            55: 
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