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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
     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>

FreeBSD 5.4		       January 19, 1999 		   FreeBSD 5.4

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