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_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_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.
