.\" $NetBSD: sl.4,v 1.1 1996/08/10 21:26:14 explorer 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 .\" $FreeBSD: src/share/man/man4/sl.4,v 1.8.2.1 2000/12/08 14:59:08 ru Exp $ .\" $DragonFly: src/share/man/man4/sl.4,v 1.2 2003/06/17 04:36:59 dillon Exp $ .\" .Dd August 10, 1996 .Dt SL 4 .Os .Sh NAME .Nm sl .Nd slip network interface .Sh SYNOPSIS .Cd "pseudo-device sl" Op Ar count .Sh DESCRIPTION The .Nm interface allows serial lines to be used as network interfaces using the .Em slip protocol. The .Nm interface can use Van Jacobson TCP header compression and ICMP filtering. This is arranged by using the various link-level flags to the .Xr ifconfig 8 command: .Pp .Bl -tag -width LINK0X -compact .It Em link0 Enable VJ header compression. .It Em link1 Suppress ICMP traffic. .It Em link2 Enable VJ header compression autodetection. This will turn on the .Em link0 flag as soon as the first VJ-compressed packet has been seen by the driver. .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 slattach 8 , .Xr sliplogin 8 , .Xr slstat 8