1.\" Copyright (c) 1996-1999 Whistle Communications, Inc. 2.\" All rights reserved. 3.\" 4.\" Subject to the following obligations and disclaimer of warranty, use and 5.\" redistribution of this software, in source or object code forms, with or 6.\" without modifications are expressly permitted by Whistle Communications; 7.\" provided, however, that: 8.\" 1. Any and all reproductions of the source or object code must include the 9.\" copyright notice above and the following disclaimer of warranties; and 10.\" 2. No rights are granted, in any manner or form, to use Whistle 11.\" Communications, Inc. trademarks, including the mark "WHISTLE 12.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as 13.\" such appears in the above copyright notice or in the software. 14.\" 15.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 16.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 17.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 18.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 19.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 20.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 21.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 22.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 23.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 24.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 25.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 26.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 27.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 28.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 31.\" OF SUCH DAMAGE. 32.\" 33.\" Author: Archie Cobbs <archie@FreeBSD.org> 34.\" 35.\" $FreeBSD$ 36.\" $Whistle: ng_rfc1490.8,v 1.4 1999/01/25 23:46:27 archie Exp $ 37.\" 38.Dd January 19, 1999 39.Dt NG_RFC1490 4 40.Os 41.Sh NAME 42.Nm ng_rfc1490 43.Nd RFC 1490 netgraph node type 44.Sh SYNOPSIS 45.In netgraph/ng_rfc1490.h 46.Sh DESCRIPTION 47The 48.Nm rfc1490 49node type performs protocol encapsulation, de-encapsulation, and 50multiplexing according to RFC 1490 (which has since been updated by RFC 2427). 51This particular type of encapsulation is often used on top of frame relay 52DLCI channels. 53.Pp 54The 55.Dv downstream 56hook is used to transmit and receive encapsulated frames. 57On the other side of the node, the 58.Dv inet 59and 60.Dv ppp 61hooks are used to transmit and receive raw IP frames and PPP frames, 62respectively. 63PPP frames are transmitted and received according to 64RFC 1973; in particular, frames appearing on the 65.Dv ppp 66hook begin with the PPP protocol number. 67The 68.Dv ethernet 69hook can be used to transmit and receive Ethernet frames (without a 70checksum) in RFC 1490's bridging format. 71.Pp 72Typically the 73.Dv inet 74hook is connected to the 75.Dv inet 76hook of an 77.Xr ng_iface 4 78node. 79.Sh HOOKS 80This node type supports the following hooks: 81.Pp 82.Bl -tag -width foobarbazum 83.It Dv downstream 84Connects to the RFC 1490 peer entity. 85.It Dv ethernet 86Transmits and receives bridged raw Ethernet frames, without a checksum. 87.It Dv inet 88Transmits and receives raw IP frames. 89.It Dv ppp 90Transmits and receives PPP frames. 91.El 92.Sh CONTROL MESSAGES 93This node type supports the generic control messages, plus the following: 94.Bl -tag -width indent 95.It Dv NGM_RFC1490_SETENCAP 96This command sets encapsulation method for the node. 97The desired method must be passed as a string message argument, 98and must be one of the following supported encapsulation modes: 99.Bl -tag -width ".Qq Li ietf-snap" 100.It Qq Li ietf-ip 101IP packets are sent using simple RFC1490/2427 encapsulation. 102.It Qq Li ietf-snap 103IP packets are sent inside SNAP frames. 104Also conforms to RFC1490/2427. 105.It Qq Li cisco 106IP packets are sent and received using proprietary Cisco encapsulation 107method. 108.El 109.It Dv NGM_RFC1490_GETENCAP 110This command returns current encapsulation method on the node. 111.El 112.Sh SHUTDOWN 113This node shuts down upon receipt of a 114.Dv NGM_SHUTDOWN 115control message, or when all hooks have been disconnected. 116.Sh SEE ALSO 117.Xr netgraph 4 , 118.Xr ng_frame_relay 4 , 119.Xr ng_iface 4 , 120.Xr ngctl 8 121.Rs 122.%A C. Brown 123.%A A. Malis 124.%T "Multiprotocol Interconnect over Frame Relay" 125.%O RFC 2427 126.Re 127.Rs 128.%A W. Simpson 129.%T "PPP in Frame Relay" 130.%O RFC 1973 131.Re 132.Pp 133.Pa http://www.cisco.com/warp/public/121/frf8modes.pdf 134.Sh HISTORY 135The 136.Nm 137node type was implemented in 138.Fx 4.0 . 139.Sh AUTHORS 140.An Julian Elischer Aq julian@FreeBSD.org 141.Sh BUGS 142Not all of RFC 1490 is implemented. 143