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+.\"	$NetBSD: sl.4,v 1.17 2020/01/19 01:25:03 thorpej 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 18, 2020
+.Dt SL 4
+.Os
+.Sh NAME
+.Nm sl
+.Nd Serial Line IP (SLIP) network interface
+.Sh SYNOPSIS
+.Cd pseudo-device sl
+.Sh DESCRIPTION
+The
+.Nm
+interface allows asynchronous serial lines to be used as
+.Tn IPv4
+network interfaces using the
+.Tn SLIP
+protocol.
+.Pp
+To use the
+.Nm
+interface, the administrator must first create the interface and assign
+a tty line to it.
+The
+.Nm
+interface is created using the
+.Xr ifconfig 8
+.Cm create
+subcommand, and
+.Xr slattach 8
+is used to assign a tty line to the interface.
+Once the interface is attached, network source and destination addresses and
+other parameters are configured via
+.Xr ifconfig 8 .
+.Pp
+The
+.Nm
+interface can use Van Jacobson
+.Tn TCP
+header compression and
+.Tn ICMP
+filtering.
+The following flags to
+.Xr ifconfig 8
+control these properties of a SLIP link:
+.Bl -tag -width Ar
+.It Ar link0
+Turn on Van Jacobson header compression.
+.It Ar -link0
+Turn off header compression. (default)
+.It Ar link1
+Don't pass through ICMP packets.
+.It Ar -link1
+Do pass through ICMP packets. (default)
+.It Ar link2
+If a packet with a compressed header is received, automatically enable
+compression of outgoing packets. (default)
+.It Ar -link2
+Don't auto-enable compression.
+.El
+.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 intro 4 ,
+.Xr ppp 4 ,
+.Xr ifconfig 8 ,
+.Xr slattach 8 ,
+.Xr sliplogin 8 ,
+.Xr slstats 8
+.Rs
+.%A J. Romkey
+.%R RFC
+.%N 1055
+.%D June 1988
+.%T "A Nonstandard for Transmission of IP Datagrams over Serial Lines: SLIP"
+.Re
+.Rs
+.%A Van Jacobson
+.%R RFC
+.%N 1144
+.%D February 1990
+.%T "Compressing TCP/IP Headers for Low-Speed Serial Links"
+.Re
+.Sh HISTORY
+The
+.Nm
+device appeared in
+.Nx 1.0 .
+.Sh BUGS
+.Tn SLIP
+can only transmit
+.Tn IPv4
+packets between preconfigured hosts on an asynchronous serial link.
+It has no provision for address negotiation,
+carriage of additional protocols (e.g.
+.Tn XNS ,
+.Tn AppleTalk ,
+.Tn DECNET ) ,
+and is not designed for synchronous serial links.
+This is why
+.Tn SLIP
+has been superseded by the Point-to-Point Protocol
+.Pq Tn PPP ,
+which does all of those things, and much more.