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.\"	$OpenBSD: ppp.4,v 1.12 2009/01/31 19:37:12 sobrado 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:
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.\" 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
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.\" 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
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.\"
.\"     From:	@(#)lo.4	8.1 (Berkeley) 6/5/93
.\"
.Dd $Mdocdate: January 31 2009 $
.Dt PPP 4
.Os
.Sh NAME
.Nm ppp
.Nd Point-to-Point Protocol network interface
.Sh SYNOPSIS
.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).
.Pp
A
.Nm
interface can be created at runtime using the
.Ic ifconfig ppp Ns Ar N Ic create
command or by setting up a
.Xr hostname.if 5
configuration file for
.Xr netstart 8 .
.Pp
The
.Nm
interface can use various types of compression and has many advantages
over the SLIP protocol used by the
.Xr sl 4
interface.
.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 sl 4 ,
.Xr hostname.if 5 ,
.Xr ifconfig 8 ,
.Xr netstart 8 ,
.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
.Ox 1.2 .
.Sh BUGS
Currently, only the
.Xr ip 4
protocol is supported.