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+.\"
+.\" Copyright (c) 1997, 1998 Hellmuth Michaelis. All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	$Id: i4bipr.4,v 1.8 1998/12/05 18:06:06 hm Exp $
+.\"
+.\"	last edit-date: [Sat Dec  5 18:38:34 1998]
+.\"
+.Dd July 6, 1998
+.Dt i4bipr 4
+.Sh NAME
+.Nm i4bipr
+.Nd isdn4bsd IP over ISDN B-channel network driver
+.Sh FreeBSD SYNOPSIS
+.Cd pseudo-device \&"i4bipr\&" Op count
+.Sh NetBSD SYNOPSIS
+none
+.Sh DESCRIPTION
+The
+.Nm
+driver interfaces the IP subsystem of the operating system with the 
+isdn4bsd package so that transport of IP packets over an ISDN link
+is possible.
+.Pp
+The driver just packs IP packets without anything appended or prepended
+into raw HDLC packets on the B channel and transfers them to a remote site.
+IP packets received from the remote site are queued into the local IP
+protocol stack.
+.Pp
+The format of the resulting packet on the B channel is:
+.Pp
+.Dl (HDLC opening flag) (IP-packet) (CRC) (HDLC closing flag)
+.Pp
+In the case where an IP packet for a remote site arrives in the driver and no
+connection has been established yet, the driver communicates with the
+.Xr isdnd 8
+daemon to establish a connection.
+.Pp
+The driver has support for interfacing to the
+.Xr bpf 4
+subsystem for using
+.Xr tcpdump 1
+with the
+.Nm ipr
+interfaces.
+.Pp
+The driver optionally (when compiled with the IPR_VJ option) provides Van 
+Jacobsen header compression, under control of the link0 and link1 options to
+.Xr ifconfig 8
+:
+.Pp 
+.Bl -tag -width 15n -offset indent -compact
+.It link0
+Apply VJ compression to outgoing packets on this interface, and assume that
+incoming packets require decompression.
+.It link1
+Check incoming packets for Van Jacobsen compression; if they appear to be
+compressed, automatically set link0.  
+.El 
+.Pp
+The default values are
+.Em on
+for
+.Em link1
+and
+.Em off
+for
+.Em link0 .
+.Sh SEE ALSO
+.Xr isdnd 8
+.Xr isdnd.rc 5
+.Xr bpf 4
+.Xr tcpdump 1
+.Sh AUTHOR
+The
+.Nm
+device driver and this manpage were written by Hellmuth Michaelis. He can be
+contacted at hm@kts.org.