19c749625f
ISDN4BSD is the work of our brand-new comitter: Hellmuth Michaelis, who has done a tremendous amount of work to bring us this far. There are still some outstanding issues and files to bring into the tree, and for now it will be needed to pick up all the extra docs from the isdn4bsd release. It is probably also a very good idea to subscribe to the isdn@freebsd.org mailing list before you try this out. These files correspond to release "beta Version 0.70.00 / December 1998" from Hellmuth.
99 lines
3.2 KiB
Groff
99 lines
3.2 KiB
Groff
.\"
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.\" Copyright (c) 1997, 1998 Hellmuth Michaelis. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id: i4bipr.4,v 1.8 1998/12/05 18:06:06 hm Exp $
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.\"
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.\" last edit-date: [Sat Dec 5 18:38:34 1998]
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.\"
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.Dd July 6, 1998
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.Dt i4bipr 4
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.Sh NAME
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.Nm i4bipr
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.Nd isdn4bsd IP over ISDN B-channel network driver
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.Sh FreeBSD SYNOPSIS
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.Cd pseudo-device \&"i4bipr\&" Op count
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.Sh NetBSD SYNOPSIS
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none
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.Sh DESCRIPTION
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The
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.Nm
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driver interfaces the IP subsystem of the operating system with the
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isdn4bsd package so that transport of IP packets over an ISDN link
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is possible.
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.Pp
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The driver just packs IP packets without anything appended or prepended
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into raw HDLC packets on the B channel and transfers them to a remote site.
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IP packets received from the remote site are queued into the local IP
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protocol stack.
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.Pp
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The format of the resulting packet on the B channel is:
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.Pp
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.Dl (HDLC opening flag) (IP-packet) (CRC) (HDLC closing flag)
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.Pp
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In the case where an IP packet for a remote site arrives in the driver and no
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connection has been established yet, the driver communicates with the
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.Xr isdnd 8
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daemon to establish a connection.
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.Pp
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The driver has support for interfacing to the
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.Xr bpf 4
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subsystem for using
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.Xr tcpdump 1
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with the
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.Nm ipr
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interfaces.
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.Pp
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The driver optionally (when compiled with the IPR_VJ option) provides Van
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Jacobsen header compression, under control of the link0 and link1 options to
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.Xr ifconfig 8
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:
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.Pp
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.Bl -tag -width 15n -offset indent -compact
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.It link0
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Apply VJ compression to outgoing packets on this interface, and assume that
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incoming packets require decompression.
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.It link1
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Check incoming packets for Van Jacobsen compression; if they appear to be
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compressed, automatically set link0.
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.El
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.Pp
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The default values are
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.Em on
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for
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.Em link1
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and
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.Em off
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for
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.Em link0 .
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.Sh SEE ALSO
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.Xr isdnd 8
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.Xr isdnd.rc 5
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.Xr bpf 4
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.Xr tcpdump 1
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.Sh AUTHOR
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The
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.Nm
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device driver and this manpage were written by Hellmuth Michaelis. He can be
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contacted at hm@kts.org.
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