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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: i4bisppp.4,v 1.9 1998/12/22 19:16:57 hm Exp $
+.\"
+.\" last edit-date: [Tue Dec 22 20:15:08 1998]
+.\"
+.Dd December 22, 1998
+.Dt i4bisppp 4
+.Sh NAME
+.Nm i4bisppp
+.Nd isdn4bsd synchronous PPP over ISDN B-channel network driver
+.Sh FreeBSD SYNOPSIS
+.Cd pseudo-device \&"i4bisppp\&" 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 a transport of IP packets over an ISDN link
+is possible.
+.Pp
+The driver is just a glue layer between Serge Vakulenko's sppp
+backend and the ISDN4BSD package.
+.Pp
+In case an IP packet for a remote side arrives in the driver and no
+connection is 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 isp
+interfaces.
+.Pp
+The
+.Xr spppcontrol 8
+utility is used to configure all aspects of PPP required to connect to a
+remote site.
+.Sh LINK0 and LINK1
+The
+.Em link0
+and
+.Em link1
+flags given as parameters to
+.Xr ifconfig 8
+have the following meaning for the
+.Nm isp
+devices:
+.Bl -tag -width link0 -compact
+.Pp
+.It Li link0
+wait passively for connection
+.Pp
+.It Li link1
+auto-dial on output
+.El
+.Pp
+The
+.Em link0
+and
+.Em link1
+flags are set to
+.Em off
+by default.
+.Pp
+See
+.Xr sppp 4
+for a more detailed discussion of the flags,
+.Pp
+.Sh SEE ALSO
+.Xr isdnd 8
+.Xr isdnd.rc 5
+.Xr spppcontrol 8
+.Xr sppp 4
+.Xr bpf 4
+.Xr tcpdump 1
+.Sh AUTHOR
+The
+.Nm
+device driver was written by Joerg Wunsch and then added to ISDN4BSD by Gary Jennejohn.
+This manpage was written by Hellmuth Michaelis. He can be contacted at hm@kts.org.
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