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NG_RFC1490(4)	       FreeBSD Kernel Interfaces Manual		 NG_RFC1490(4)

NAME
     ng_rfc1490	-- RFC 1490 netgraph node type

SYNOPSIS
     #include <netgraph/ng_rfc1490.h>

DESCRIPTION
     The rfc1490 node type performs protocol encapsulation, de-encapsulation,
     and multiplexing according	to RFC 1490 (which has since been updated by
     RFC 2427).	 This particular type of encapsulation is often	used on	top of
     frame relay DLCI channels.

     The downstream hook is used to transmit and receive encapsulated frames.
     On	the other side of the node, the	inet and ppp hooks are used to trans-
     mit and receive raw IP frames and PPP frames, respectively.  PPP frames
     are transmitted and received according to RFC 1973; in particular,	frames
     appearing on the ppp hook begin with the PPP protocol number.  The
     ethernet hook can be used to transmit and receive Ethernet	frames (with-
     out a checksum) in	RFC 1490's bridging format.

     Typically the inet	hook is	connected to the inet hook of an ng_iface(4)
     node.

HOOKS
     This node type supports the following hooks:

     downstream	  Connects to the RFC 1490 peer	entity.

     ethernet	  Transmits and	receives bridged raw Ethernet frames, without
		  a checksum.

     inet	  Transmits and	receives raw IP	frames.

     ppp	  Transmits and	receives PPP frames.

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

     NGM_RFC1490_SETENCAP
	     This command sets encapsulation method for	the node.  The desired
	     method must be passed as a	string message argument, and must be
	     one of the	following supported encapsulation modes:

	     "ietf-ip"	  IP packets are sent using simple RFC1490/2427	encap-
			  sulation.

	     "ietf-snap"  IP packets are sent inside SNAP frames.  Also	con-
			  forms	to RFC1490/2427.

	     "cisco"	  IP packets are sent and received using proprietary
			  Cisco	encapsulation method.

     NGM_RFC1490_GETENCAP
	     This command returns current encapsulation	method on the node.

SHUTDOWN
     This node shuts down upon receipt of a NGM_SHUTDOWN control message, or
     when all hooks have been disconnected.

SEE ALSO
     netgraph(4), ng_frame_relay(4), ng_iface(4), ngctl(8)

     C.	Brown and A. Malis, Multiprotocol Interconnect over Frame Relay, RFC
     2427.

     W.	Simpson, PPP in	Frame Relay, RFC 1973.

     http://www.cisco.com/warp/public/121/frf8modes.pdf

HISTORY
     The ng_rfc1490 node type was implemented in FreeBSD 4.0.

AUTHORS
     Julian Elischer <julian@FreeBSD.org>

BUGS
     Not all of	RFC 1490 is implemented.

FreeBSD	9.2		       January 19, 1999			   FreeBSD 9.2

NAME | SYNOPSIS | DESCRIPTION | HOOKS | CONTROL MESSAGES | SHUTDOWN | SEE ALSO | HISTORY | AUTHORS | BUGS

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