— RFC 1490 netgraph node
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.
hook is used to transmit and receive
encapsulated frames. On the other side of the node, the
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
hook begin with the PPP protocol
hook can be used to transmit and
receive Ethernet frames (without a checksum) in RFC 1490's bridging format.
hook is connected to the
hook of an ng_iface(4)
This node type supports the following hooks:
- Connects to the RFC 1490 peer entity.
- Transmits and receives bridged raw Ethernet frames, without
- Transmits and receives raw IP frames.
- Transmits and receives PPP frames.
This node type supports the generic control messages, plus the following:
- 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:
- IP packets are sent using simple RFC1490/2427
- IP packets are sent inside SNAP frames. Also conforms
- IP packets are sent and received using proprietary
Cisco encapsulation method.
- This command returns current encapsulation method on the
This node shuts down upon receipt of a
control message, or when all hooks have been disconnected.
C. Brown and A.
Malis, Multiprotocol Interconnect over Frame
Relay, RFC 2427.
W. Simpson, PPP in
Frame Relay, RFC 1973.
node type was implemented in
Not all of RFC 1490 is implemented.