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33 .\" Author: Archie Cobbs <archie@FreeBSD.org>
36 .\" $Whistle: ng_rfc1490.8,v 1.4 1999/01/25 23:46:27 archie Exp $
43 .Nd RFC 1490 netgraph node type
45 .In netgraph/ng_rfc1490.h
49 node type performs protocol encapsulation, de-encapsulation, and
50 multiplexing according to RFC 1490 (which has since been updated by RFC 2427).
51 This particular type of encapsulation is often used on top of frame relay
56 hook is used to transmit and receive encapsulated frames.
57 On the other side of the node, the
61 hooks are used to transmit and receive raw IP frames and PPP frames,
63 PPP frames are transmitted and received according to
64 RFC 1973; in particular, frames appearing on the
66 hook begin with the PPP protocol number.
69 hook can be used to transmit and receive Ethernet frames (without a
70 checksum) in RFC 1490's bridging format.
74 hook is connected to the
80 This node type supports the following hooks:
81 .Bl -tag -width ".Va downstream"
83 Connects to the RFC 1490 peer entity.
85 Transmits and receives bridged raw Ethernet frames, without a checksum.
87 Transmits and receives raw IP frames.
89 Transmits and receives PPP frames.
92 This node type supports the generic control messages, plus the following:
94 .It Dv NGM_RFC1490_SET_ENCAP Pq Ic setencap
95 This command sets encapsulation method for the node.
96 The desired method must be passed as a string message argument,
97 and must be one of the following supported encapsulation modes:
98 .Bl -tag -width ".Qq Li ietf-snap"
100 IP packets are sent using simple RFC1490/2427 encapsulation.
102 IP packets are sent inside SNAP frames.
103 Also conforms to RFC1490/2427.
105 IP packets are sent and received using proprietary Cisco encapsulation
108 .It Dv NGM_RFC1490_GET_ENCAP Pq Ic getencap
109 This command returns current encapsulation method on the node.
112 This node shuts down upon receipt of a
114 control message, or when all hooks have been disconnected.
117 .Xr ng_frame_relay 4 ,
123 .%T "Multiprotocol Interconnect over Frame Relay"
128 .%T "PPP in Frame Relay"
132 .Pa http://www.cisco.com/warp/public/121/frf8modes.pdf
136 node type was implemented in
139 .An Julian Elischer Aq julian@FreeBSD.org
141 Not all of RFC 1490 is implemented.