1.\" $NetBSD: ppp.4,v 1.7 2002/09/27 22:40:58 wiz Exp $ 2.\" 3.\" Copyright (c) 1983, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" From: @(#)lo.4 8.1 (Berkeley) 6/5/93 35.\" 36.Dd September 27, 2002 37.Dt PPP 4 38.Os 39.Sh NAME 40.Nm ppp 41.Nd point to point protocol network interface 42.Sh SYNOPSIS 43.Cd options PPP_BSDCOMP 44.Cd options PPP_DEFLATE 45.Cd options PPP_FILTER 46.Pp 47.Cd pseudo-device ppp Op Ar count 48.Sh DESCRIPTION 49The 50.Nm 51interface allows serial lines to be used as network interfaces using the 52.Em Point-to-Point Protocol 53(PPP). 54The 55.Nm 56interface can use various types of compression and has many features 57over the SLIP protocol used by the 58.Xr sl 4 59interface. 60.Pp 61Supported options are: 62.Bl -tag -width 20n -compact 63.It Cd options PPP_BSDCOMP 64Enable support for BSD-compress (`bsdcomp') compression in ppp. 65.It Cd options PPP_DEFLATE 66Enable support for deflate compression in ppp. 67.It Cd options PPP_FILTER 68This option turns on 69.Xr pcap 3 70based filtering for ppp connections. 71This option is used by 72.Xr pppd 8 73which needs to be compiled with 74.Em PPP_FILTER 75defined (the current default). 76.El 77.Sh DIAGNOSTICS 78.Bl -diag 79.It ppp%d: af%d not supported . 80The interface was handed 81a message with addresses formatted in an unsuitable address 82family; the packet was dropped. 83.El 84.Sh SEE ALSO 85.Xr inet 4 , 86.Xr intro 4 , 87.Xr sl 4 , 88.Xr pppd 8 , 89.Xr pppstats 8 90.Rs 91.%R RFC 92.%N 1661 93.%D July 1994 94.%T "The Point-to-Point Protocol (PPP)" 95.Re 96.Sh HISTORY 97The 98.Nm 99device appeared in 100.Nx 1.0 . 101.Sh BUGS 102Currently, only the 103.Xr ip 4 104protocol is supported. 105