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10-20-2008
Thanks for your reply. In C++, these 2 concepts're implemented. As far as my understanding is encapsulation protects abstraction. Is it possible to give sample code for both.
Thanks,
Naga
Thanks,
Naga
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LEARN ABOUT REDHAT
ng_rfc1490
NG_RFC1490(4) BSD Kernel Interfaces Manual 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 transmit and receive raw IP frames and PPP frames, respectively. PPP frames are transmitted and received according to RFC 1973; in particu- lar, 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. BSD
January 19, 1999 BSD