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+.\"	$NetBSD: ppp.4,v 1.13 2005/01/10 19:22:25 perry Exp $
+.\"
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  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.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+.\"
+.\"     From:	@(#)lo.4	8.1 (Berkeley) 6/5/93
+.\"
+.Dd January 10, 2005
+.Dt PPP 4
+.Os
+.Sh NAME
+.Nm ppp
+.Nd point to point protocol network interface
+.Sh SYNOPSIS
+.Cd options PPP_BSDCOMP
+.Cd options PPP_DEFLATE
+.Cd options PPP_FILTER
+.Pp
+.Cd pseudo-device ppp
+.Sh DESCRIPTION
+The
+.Nm
+interface allows serial lines to be used as network interfaces using the
+.Em Point-to-Point Protocol
+(PPP).
+The
+.Nm
+interface can use various types of compression and has many features
+over the SLIP protocol used by the
+.Xr sl 4
+interface.
+.Pp
+Supported options are:
+.Bl -tag -width 20n -compact
+.It Cd options PPP_BSDCOMP
+Enable support for BSD-compress (`bsdcomp') compression in ppp.
+.It Cd options PPP_DEFLATE
+Enable support for deflate compression in ppp.
+.It Cd options PPP_FILTER
+This option turns on
+.Xr pcap 3
+based filtering for ppp connections.
+This option is used by
+.Xr pppd 8
+which needs to be compiled with
+.Em PPP_FILTER
+defined (the current default).
+.El
+.Sh DIAGNOSTICS
+.Bl -diag
+.It ppp%d: af%d not supported .
+The interface was handed
+a message with addresses formatted in an unsuitable address
+family; the packet was dropped.
+.El
+.Sh SEE ALSO
+.Xr inet 4 ,
+.Xr intro 4 ,
+.Xr sl 4 ,
+.Xr pppd 8 ,
+.Xr pppstats 8
+.Rs
+.%R RFC 1661
+.%D July 1994
+.%T "The Point-to-Point Protocol (PPP)"
+.Re
+.Sh HISTORY
+The
+.Nm
+device appeared in
+.Nx 1.0 .
+.Sh BUGS
+Currently, only the
+.Xr ip 4
+and
+.Xr ip6 4
+protocols are supported.