.\"	$OpenBSD: sl.4,v 1.12 2006/05/09 19:03:04 jmc Exp $
.\"	$NetBSD: sl.4,v 1.1 1996/08/10 21:26:14 explorer Exp $
.\"
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.\"     From:	@(#)lo.4	8.1 (Berkeley) 6/5/93
.\"
.Dd August 10, 1996
.Dt SL 4
.Os
.Sh NAME
.Nm sl
.Nd slip network interface
.Sh SYNOPSIS
.Cd "pseudo-device sl"
.Sh DESCRIPTION
The
.Nm
interface allows serial lines to be used as network interfaces using the
.Em slip
protocol.
.Pp
An
.Nm
interface can be created at runtime using the
.Ic ifconfig sl Ns Ar N Ic create
command or by setting up a
.Xr hostname.if 5
configuration file for
.Xr netstart 8 .
.Pp
The
.Nm sl
interface can use Van Jacobson TCP header compression and ICMP filtering.
.Sh DIAGNOSTICS
.Bl -diag
.It sl%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 netintro 4 ,
.Xr hostname.if 5 ,
.Xr ifconfig 8 ,
.Xr netstart 8 ,
.Xr slattach 8 ,
.Xr sliplogin 8 ,
.Xr slstats 8