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 transmit 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 (without 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_SET_ENCAP (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 encapsulation.

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

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

       NGM_RFC1490_GET_ENCAP (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.

Debian                                          January 19, 1999                                   NG_RFC1490(4)