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+.\" Copyright (c) 1996-1999 Whistle Communications, Inc.
+.\" All rights reserved.
+.\" 
+.\" Subject to the following obligations and disclaimer of warranty, use and
+.\" redistribution of this software, in source or object code forms, with or
+.\" without modifications are expressly permitted by Whistle Communications;
+.\" provided, however, that:
+.\" 1. Any and all reproductions of the source or object code must include the
+.\"    copyright notice above and the following disclaimer of warranties; and
+.\" 2. No rights are granted, in any manner or form, to use Whistle
+.\"    Communications, Inc. trademarks, including the mark "WHISTLE
+.\"    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
+.\"    such appears in the above copyright notice or in the software.
+.\" 
+.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
+.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
+.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
+.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
+.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
+.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
+.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
+.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
+.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
+.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
+.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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+.\" OF SUCH DAMAGE.
+.\" 
+.\" Author: Archie Cobbs <archie@whistle.com>
+.\"
+.\" $FreeBSD$
+.\" $Whistle: ng_rfc1490.8,v 1.4 1999/01/25 23:46:27 archie Exp $
+.\"
+.Dd January 19, 1999
+.Dt NG_RFC1490 8
+.Os FreeBSD 3
+.Sh NAME
+.Nm ng_rfc1490
+.Nd RFC 1490 netgraph node type
+.Sh SYNOPSIS
+.Fd #include <netgraph/ng_rfc1490.h>
+.Sh DESCRIPTION
+The
+.Nm 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.
+.Pp
+The
+.Dv downstream
+hook is used to transmit and receive encapsulated frames. On the other
+side of the node, the
+.Dv inet
+and
+.Dv 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
+.Dv ppp
+hook begin with the PPP protocol number.
+.Pp
+Typically the
+.Dv inet
+hook is connected to the
+.Dv inet
+hook of an
+.Xr ng_iface 8
+node.
+.Sh HOOKS
+This node type supports the following hooks:
+.Pp
+.Bl -tag -width foobarbazum
+.It Dv downstream
+Connects to the RFC 1490 peer entity.
+.It Dv inet
+Transmits and receives raw IP frames.
+.It Dv ppp
+Transmits and receives PPP frames.
+.El
+.Sh CONTROL MESSAGES
+This node type only supports the generic control messages.
+.Sh SHUTDOWN
+This node shuts down upon receipt of a
+.Dv NGM_SHUTDOWN
+control message, or when all hooks have been disconnected.
+.Sh BUGS
+Not all of RFC 1490 is implemented.
+.Sh SEE ALSO
+.Xr netgraph 4 ,
+.Xr ng_frame_relay 8 ,
+.Xr ng_iface 8 ,
+.Xr ngctl 8 .
+.Rs
+.%A C. Brown, A. Malis
+.%T "Multiprotocol Interconnect over Frame Relay"
+.%O RFC 2427
+.Re
+.Rs
+.%A W. Simpson
+.%T "PPP in Frame Relay"
+.%O RFC 1973
+.Re
+.Sh AUTHOR
+Julian Elisher <julian@whistle.com>