100 lines
3.2 KiB
Groff
100 lines
3.2 KiB
Groff
.\"
|
|
.\" Copyright (c) 1997, 1999 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.\" last edit-date: [Sun Feb 14 10:36:40 1999]
|
|
.\"
|
|
.Dd July 6, 1998
|
|
.Dt I4BIPR 4
|
|
.Os
|
|
.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 tcpdump 1 ,
|
|
.Xr bpf 4 ,
|
|
.Xr isdnd.rc 5 ,
|
|
.Xr isdnd 8
|
|
.Sh AUTHORS
|
|
The
|
|
.Nm
|
|
device driver and this manpage were written by
|
|
.An Hellmuth Michaelis Aq hm@kts.org
|