1.\" $NetBSD: ppp.4,v 1.13 2005/01/10 19:22:25 perry 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. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" From: @(#)lo.4 8.1 (Berkeley) 6/5/93 31.\" 32.Dd January 10, 2005 33.Dt PPP 4 34.Os 35.Sh NAME 36.Nm ppp 37.Nd point to point protocol network interface 38.Sh SYNOPSIS 39.Cd options PPP_BSDCOMP 40.Cd options PPP_DEFLATE 41.Cd options PPP_FILTER 42.Pp 43.Cd pseudo-device ppp 44.Sh DESCRIPTION 45The 46.Nm 47interface allows serial lines to be used as network interfaces using the 48.Em Point-to-Point Protocol 49(PPP). 50The 51.Nm 52interface can use various types of compression and has many features 53over the SLIP protocol used by the 54.Xr sl 4 55interface. 56.Pp 57Supported options are: 58.Bl -tag -width 20n -compact 59.It Cd options PPP_BSDCOMP 60Enable support for BSD-compress (`bsdcomp') compression in ppp. 61.It Cd options PPP_DEFLATE 62Enable support for deflate compression in ppp. 63.It Cd options PPP_FILTER 64This option turns on 65.Xr pcap 3 66based filtering for ppp connections. 67This option is used by 68.Xr pppd 8 69which needs to be compiled with 70.Em PPP_FILTER 71defined (the current default). 72.El 73.Sh DIAGNOSTICS 74.Bl -diag 75.It ppp%d: af%d not supported . 76The interface was handed 77a message with addresses formatted in an unsuitable address 78family; the packet was dropped. 79.El 80.Sh SEE ALSO 81.Xr inet 4 , 82.Xr intro 4 , 83.Xr sl 4 , 84.Xr pppd 8 , 85.Xr pppstats 8 86.Rs 87.%R RFC 1661 88.%D July 1994 89.%T "The Point-to-Point Protocol (PPP)" 90.Re 91.Sh HISTORY 92The 93.Nm 94device appeared in 95.Nx 1.0 . 96.Sh BUGS 97Currently, only the 98.Xr ip 4 99and 100.Xr ip6 4 101protocols are supported. 102