Update to better reflect reality.
This commit is contained in:
Archie Cobbs
parent
aa5297630e
commit
db8cd7ce1f
@ -50,28 +50,28 @@ node type performs conversion between synchronous frames and
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asynchronous frames, as defined for the PPP protocol in RFC 1662.
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Asynchronous framing uses flag bytes and octet-stuffing
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to simulate a frame oriented connection over an octet-oriented
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asynchronous line.
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asynchronous serial line.
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.Pp
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The node transmits and receives asynchronous data on the
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.Dv async
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hook. Incoming data mbuf boundaries are ignored, while
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outgoing data is sent as a complete frame at a time.
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.Pp
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There are two synchronous hooks,
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hook. Mbuf boundaries of incoming data are ignored.
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Once a complete packet has been received, it is decoded and
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stripped of all framing bytes, and transmitted out the
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.Dv sync
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and
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.Dv sync2 .
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For both hooks, received packets are encoded as asynchronous frames
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hook as a single frame. The address and control bytes,
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if present, are removed from the beginning of the frame.
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.Pp
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Synchronous frames are transmitted and received on the
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.Dv sync
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hook.
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Packets received on this hook are encoded as asynchronous frames
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and sent out on
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.Dv async .
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Hook
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.Dv sync2
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differs from
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.Dv sync
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only in that any configured address and control field compression
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and/or control character escaping is disabled when the frame is encoded.
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This is useful for transmitting PPP LCP packets, which are always sent
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this way.
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Received packets should start with the PPP protocol field.
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If the LCP protocol (0xc021) is detected,
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address and control field compression is disabled
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and complete control character escaping is enabled for that frame
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(in PPP, LCP packets are always sent with these settings).
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.Pp
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This node supports ``flag sharing'' for packets transmitted on
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.Dv async .
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@ -92,9 +92,7 @@ node, which handles transmission of serial data over a tty device.
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Synchronous connection. This hook sends and receives synchronous frames.
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For PPP, these frames contain no address, control, or checksum fields;
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each frame begins with the PPP protocol number. Typically this hook would
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be connected to the
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.Dv downstream
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hook of a
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be connected to a link hook of a
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.Xr ng_ppp 8
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type node.
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.El
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@ -50,28 +50,28 @@ node type performs conversion between synchronous frames and
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asynchronous frames, as defined for the PPP protocol in RFC 1662.
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Asynchronous framing uses flag bytes and octet-stuffing
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to simulate a frame oriented connection over an octet-oriented
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asynchronous line.
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asynchronous serial line.
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.Pp
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The node transmits and receives asynchronous data on the
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.Dv async
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hook. Incoming data mbuf boundaries are ignored, while
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outgoing data is sent as a complete frame at a time.
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.Pp
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There are two synchronous hooks,
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hook. Mbuf boundaries of incoming data are ignored.
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Once a complete packet has been received, it is decoded and
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stripped of all framing bytes, and transmitted out the
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.Dv sync
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and
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.Dv sync2 .
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For both hooks, received packets are encoded as asynchronous frames
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hook as a single frame. The address and control bytes,
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if present, are removed from the beginning of the frame.
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.Pp
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Synchronous frames are transmitted and received on the
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.Dv sync
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hook.
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Packets received on this hook are encoded as asynchronous frames
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and sent out on
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.Dv async .
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Hook
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.Dv sync2
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differs from
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.Dv sync
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only in that any configured address and control field compression
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and/or control character escaping is disabled when the frame is encoded.
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This is useful for transmitting PPP LCP packets, which are always sent
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this way.
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Received packets should start with the PPP protocol field.
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If the LCP protocol (0xc021) is detected,
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address and control field compression is disabled
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and complete control character escaping is enabled for that frame
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(in PPP, LCP packets are always sent with these settings).
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.Pp
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This node supports ``flag sharing'' for packets transmitted on
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.Dv async .
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@ -92,9 +92,7 @@ node, which handles transmission of serial data over a tty device.
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Synchronous connection. This hook sends and receives synchronous frames.
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For PPP, these frames contain no address, control, or checksum fields;
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each frame begins with the PPP protocol number. Typically this hook would
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be connected to the
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.Dv downstream
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hook of a
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be connected to a link hook of a
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.Xr ng_ppp 8
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type node.
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.El
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@ -50,28 +50,28 @@ node type performs conversion between synchronous frames and
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asynchronous frames, as defined for the PPP protocol in RFC 1662.
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Asynchronous framing uses flag bytes and octet-stuffing
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to simulate a frame oriented connection over an octet-oriented
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asynchronous line.
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asynchronous serial line.
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.Pp
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The node transmits and receives asynchronous data on the
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.Dv async
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hook. Incoming data mbuf boundaries are ignored, while
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outgoing data is sent as a complete frame at a time.
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.Pp
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There are two synchronous hooks,
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hook. Mbuf boundaries of incoming data are ignored.
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Once a complete packet has been received, it is decoded and
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stripped of all framing bytes, and transmitted out the
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.Dv sync
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and
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.Dv sync2 .
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For both hooks, received packets are encoded as asynchronous frames
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hook as a single frame. The address and control bytes,
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if present, are removed from the beginning of the frame.
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.Pp
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Synchronous frames are transmitted and received on the
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.Dv sync
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hook.
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Packets received on this hook are encoded as asynchronous frames
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and sent out on
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.Dv async .
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Hook
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.Dv sync2
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differs from
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.Dv sync
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only in that any configured address and control field compression
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and/or control character escaping is disabled when the frame is encoded.
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This is useful for transmitting PPP LCP packets, which are always sent
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this way.
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Received packets should start with the PPP protocol field.
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If the LCP protocol (0xc021) is detected,
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address and control field compression is disabled
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and complete control character escaping is enabled for that frame
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(in PPP, LCP packets are always sent with these settings).
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.Pp
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This node supports ``flag sharing'' for packets transmitted on
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.Dv async .
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@ -92,9 +92,7 @@ node, which handles transmission of serial data over a tty device.
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Synchronous connection. This hook sends and receives synchronous frames.
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For PPP, these frames contain no address, control, or checksum fields;
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each frame begins with the PPP protocol number. Typically this hook would
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be connected to the
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.Dv downstream
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hook of a
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be connected to a link hook of a
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.Xr ng_ppp 8
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type node.
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.El
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