110 lines
3.7 KiB
Groff
110 lines
3.7 KiB
Groff
.\" $NetBSD: plip.4,v 1.6 1999/12/15 23:44:53 abs Exp $
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.\"
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.\" Copyright (c) 1994, 1997 Matthias Pfaller.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Matthias Pfaller.
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.\" 4. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\"
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.Dd December 1, 1994
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.Dt PLIP 4 pc532
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.Os
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.Sh NAME
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.Nm plip
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.Nd Option for the lpt driver to allow IP over Centronics parallel ports
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.Sh SYNOPSIS
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.Cd "options PLIP"
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.Cd "options COMPAT_PLIP10"
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.Cd "options COMPAT_PLIP11"
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.Sh DESCRIPTION
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The
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.Nm
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interface provides a way to transport IP over Centronics parallel ports.
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Protocols to communicate with Linux 1.0 and Linux 1.1 hosts are provided.
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By default the 1.1 protocol is used.
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To choose the 1.0 protocol use the link0 flag with
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.Xr ifconfig 8 .
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In order to use the 1.0 protocol the kernel has to be compiled with
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COMPAT_PLIP10.
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.Pp
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The COMPAT_PLIP11 option selects a default MTU of 1486 bytes.
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This is necessary to work around a bug that is present in the
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.Nm
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code for Linux 1.1.x and Linux 1.2.x.
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.Sh NOTES
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To connect two computers a "Laplink parallel cable" is used:
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.sp
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.TS
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allbox tab(|);
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c|c|c|c
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l|n|n|l.
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Signalname|Con A|Con B|Description
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Data 0|2|15|Data out 0
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Data 1|3|13|Data out 1
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Data 2|4|12|Data out 2
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Data 3|5|10|Data out 3/Wake out
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Data 4|6|11|Data clock out
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/Ack|10|5|Data in 3/Wake in
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Busy|11|6|Data clock in
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No Paper|12|4|Data in 2
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Select|13|3|Data in 1
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/Error|15|2|Data in 0
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Gnd|18-25|18-25|Ground
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.TE
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.Pp
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In both protocol versions Ethernet frames are used.
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The 1.0 protocol assigns an Ethernet address of the form
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FD:FD:ww:xx:yy:zz to the interface.
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.Pp
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The 1.1 protocol uses FC instead of FD, with ww, xx, yy and zz are
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taken from the internet address ww.xx.yy.zz of the interface.
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Ethernet support has to be configured into the kernel in order to use the
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.Nm
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interface.
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "plip?: tx hard error"
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Packet transmission failed even after
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.Dv PLIPMXRETRY
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(20) retries.
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.It "plip?: rx hard error"
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.Dv PLIPMXERRS
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(20) packets caused receive errors in sequence.
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.It "plip?: checksum error"
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A packet with a bad checksum was received.
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.It "plip?: packet > MTU"
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A bogus packet longer then the Maximum Transmission Unit (MTU)
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length for the media was received.
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.El
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.Sh SEE ALSO
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.Xr lpt 4 ,
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.Xr ifconfig 8
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.Sh HISTORY
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The
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.Nm
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interface appeared in
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.Nx 1.0 .
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