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. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by the University of
California, Berkeley and its contributors.
4. 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 August 10, 1996 .Dt SL 4 .Os .Sh NAME .Nm sl .Nd Serial Line IP (SLIP) network interface .Sh SYNOPSIS .Cd pseudo-device sl Op Ar count .Sh DESCRIPTION The .Nm interface allows asynchronous serial lines to be used as .Tn IP network interfaces using the .Tn SLIP protocol. The .Nm interface can use Van Jacobson .Tn TCP header compression and .Tn ICMP filtering.
p However, .Tn SLIP can only transmit .Tn IP 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 This is why .Tn SLIP has been superceded by the Point-to-Point Protocol
q Tn PPP , which does all of those things, and much more. .Sh DIAGNOSTICS l -diag t 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 intro 4 , .Xr inet 4 , .Xr ppp 4 , .Xr slattach 8 , .Xr sliplogin 8 , .Xr slstats 8 .Rs .%R RFC .%N 1055 .%D June 1988 .%T "A Nonstandard for Transmission of IP Datagrams over Serial Lines: SLIP" .Re .Sh HISTORY The .Nm device appeared in .Nx 1.0 .