142 lines
4.7 KiB
Groff
142 lines
4.7 KiB
Groff
.\" Copyright (c) 1996-1999 Whistle Communications, Inc.
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.\" All rights reserved.
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.\"
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.\" Subject to the following obligations and disclaimer of warranty, use and
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.\" redistribution of this software, in source or object code forms, with or
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.\" without modifications are expressly permitted by Whistle Communications;
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.\" provided, however, that:
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.\" 1. Any and all reproductions of the source or object code must include the
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.\" copyright notice above and the following disclaimer of warranties; and
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.\" 2. No rights are granted, in any manner or form, to use Whistle
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.\" Communications, Inc. trademarks, including the mark "WHISTLE
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.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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.\" such appears in the above copyright notice or in the software.
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.\"
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.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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.\" OF SUCH DAMAGE.
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.\"
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.\" Author: Archie Cobbs <archie@FreeBSD.org>
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.\"
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.\" $FreeBSD$
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.\" $Whistle: ng_rfc1490.8,v 1.4 1999/01/25 23:46:27 archie Exp $
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.\"
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.Dd January 19, 1999
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.Dt NG_RFC1490 4
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.Os
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.Sh NAME
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.Nm ng_rfc1490
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.Nd RFC 1490 netgraph node type
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.Sh SYNOPSIS
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.In netgraph/ng_rfc1490.h
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.Sh DESCRIPTION
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The
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.Nm rfc1490
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node type performs protocol encapsulation, de-encapsulation, and
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multiplexing according to RFC 1490 (which has since been updated by RFC 2427).
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This particular type of encapsulation is often used on top of frame relay
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DLCI channels.
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.Pp
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The
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.Dv downstream
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hook is used to transmit and receive encapsulated frames.
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On the other side of the node, the
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.Dv inet
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and
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.Dv ppp
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hooks are used to transmit and receive raw IP frames and PPP frames,
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respectively.
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PPP frames are transmitted and received according to
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RFC 1973; in particular, frames appearing on the
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.Dv ppp
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hook begin with the PPP protocol number.
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The
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.Dv ethernet
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hook can be used to transmit and receive Ethernet frames (without a
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checksum) in RFC 1490's bridging format.
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.Pp
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Typically the
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.Dv inet
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hook is connected to the
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.Dv inet
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hook of an
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.Xr ng_iface 4
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node.
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.Sh HOOKS
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This node type supports the following hooks:
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.Bl -tag -width ".Va downstream"
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.It Va downstream
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Connects to the RFC 1490 peer entity.
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.It Va ethernet
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Transmits and receives bridged raw Ethernet frames, without a checksum.
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.It Va inet
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Transmits and receives raw IP frames.
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.It Va ppp
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Transmits and receives PPP frames.
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.El
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.Sh CONTROL MESSAGES
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This node type supports the generic control messages, plus the following:
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.Bl -tag -width foo
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.It Dv NGM_RFC1490_SET_ENCAP Pq Ic setencap
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This command sets encapsulation method for the node.
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The desired method must be passed as a string message argument,
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and must be one of the following supported encapsulation modes:
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.Bl -tag -width ".Qq Li ietf-snap"
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.It Qq Li ietf-ip
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IP packets are sent using simple RFC1490/2427 encapsulation.
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.It Qq Li ietf-snap
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IP packets are sent inside SNAP frames.
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Also conforms to RFC1490/2427.
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.It Qq Li cisco
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IP packets are sent and received using proprietary Cisco encapsulation
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method.
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.El
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.It Dv NGM_RFC1490_GET_ENCAP Pq Ic getencap
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This command returns current encapsulation method on the node.
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.El
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.Sh SHUTDOWN
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This node shuts down upon receipt of a
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.Dv NGM_SHUTDOWN
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control message, or when all hooks have been disconnected.
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.Sh SEE ALSO
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.Xr netgraph 4 ,
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.Xr ng_frame_relay 4 ,
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.Xr ng_iface 4 ,
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.Xr ngctl 8
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.Rs
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.%A C. Brown
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.%A A. Malis
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.%T "Multiprotocol Interconnect over Frame Relay"
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.%O RFC 2427
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.Re
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.Rs
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.%A W. Simpson
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.%T "PPP in Frame Relay"
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.%O RFC 1973
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.Re
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.Pp
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.Pa http://www.cisco.com/warp/public/121/frf8modes.pdf
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.Sh HISTORY
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The
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.Nm
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node type was implemented in
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.Fx 4.0 .
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.Sh AUTHORS
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.An Julian Elischer Aq Mt julian@FreeBSD.org
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.Sh BUGS
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Not all of RFC 1490 is implemented.
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