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  aac(4)
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  net(4)
  netgraph(4)
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  networking(4)
  ng_UI(4)
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  ng_atm(4)
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  ng_echo(4)
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  ng_lmi(4)
  ng_mppc(4)
  ng_netflow(4)
  ng_one2many(4)
  ng_ppp(4)
  ng_pppoe(4)
  ng_pptpgre(4)
  ng_rfc1490(4)
  ng_socket(4)
  ng_split(4)
  ng_sppp(4)
  ng_sscfu(4)
  ng_sscop(4)
  ng_tee(4)
  ng_tty(4)
  ng_ubt(4)
  ng_uni(4)
  ng_vjc(4)
  ng_vlan(4)
  nge(4)
  nmdm(4)
  npx(4)
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  null(4)
  ohci(4)
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  oltr(4)
  opie(4)
  orm(4)
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  zero(4)

ng_sppp(4)

NAME

     ng_sppp -- sppp netgraph node type


SYNOPSIS

     #include <netgraph/ng_sppp.h>


DESCRIPTION

     An sppp node is a netgraph(4) interface to the original sppp(4) network
     module for synchronous lines.  Currently, sppp(4) supports PPP and Cisco
     HDLC protocols.  An sppp node could be considered as an alternative ker-
     nel mode PPP implementation to net/mpd port + ng_ppp(4), and as an alter-
     native to ng_cisco(4) node.  While having less features than net/mpd +
     ng_ppp(4), it is significantly easier to use in the majority of simple
     configurations, and allows the administrator to not install the net/mpd
     port.  With sppp you do not need any other nodes, not even an ng_iface(4)
     node.  When an sppp node is created, a new interface appears which is
     accessible via ifconfig(8).  Network interfaces corresponding to sppp
     nodes are named sppp0, sppp1, etc.  When a node is shut down, the corre-
     sponding interface is removed, and the interface name becomes available
     for reuse by future sppp nodes.  New nodes always take the first unused
     interface.  The node itself is assigned the same name as its interface,
     unless the name already exists, in which case the node remains unnamed.
     The sppp node allows drivers written to the old sppp(4) interface to be
     rewritten using the newer more powerful netgraph(4) interface, and still
     behave in a compatible manner without supporting both network modules.

     An sppp node has a single hook named downstream.  Usually it is connected
     directly to a device driver hook.

     The sppp nodes support the Berkeley Packet Filter, bpf(4).


HOOKS

     This node type supports the following hooks:

     downstream  The connection to the synchronous line.


CONTROL MESSAGES

     This node type supports the generic control messages, plus the following:

     NGM_IFACE_GET_IFNAME
	     Returns the name of the interface corresponding to this node in a
	     struct ng_iface_ifname:

		   struct ng_iface_ifname {
		     char  ngif_name[NG_SPPP_IFACE_NAME_MAX + 1];
		   };


SHUTDOWN

     This node shuts down upon receipt of a NGM_SHUTDOWN control message.  The
     associated interface is removed and becomes available for use by future
     sppp nodes.

     Unlike most other node types and like ng_iface(4) does, an sppp node does
     not go away when all hooks have been disconnected; rather, an explicit
     NGM_SHUTDOWN control message is required.


EXAMPLES



SEE ALSO

     bpf(4), cx(4), netgraph(4), ng_cisco(4), ng_iface(4), ng_ppp(4), sppp(4),
     ifconfig(8), ngctl(8), spppcontrol(8)

     For complex networking topologies you may want to look at net/mpd port.


HISTORY

     The sppp node type was implemented for FreeBSD 5.0.  It was included to
     the system since FreeBSD 5.3.


AUTHORS

     Copyright (C) 2003-2004 Roman Kurakin <rik@cronyx.ru>.

FreeBSD 5.4			March 29, 2004			   FreeBSD 5.4

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