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<sect1 id="plip" arch="x86">
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<title>Installing &debian; over Parallel Line IP (PLIP)</title>
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<para>
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This section explains how to install &debian; on a computer without an
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Ethernet card, but with just a remote gateway computer attached via
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a Null-Modem cable (also called Null-Printer cable). The gateway
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computer should be connected to a network that has a Debian mirror
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on it (e.g. to the Internet).
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</para><para>
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In the example in this appendix we will set up a PLIP connection using
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a gateway connected to the Internet over a dial-up connection (ppp0).
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We will use IP addresses 192.168.0.1 and 192.168.0.2 for the PLIP
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interfaces on the target system and the source system respectively
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(these addresses should be unused within your network address space).
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</para><para>
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The PLIP connection set up during the installation will also be available
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after the reboot into the installed system (see <xref linkend="boot-new"/>).
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</para><para>
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Before you start, you will need to check the BIOS configuration (IO base
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address and IRQ) for the parallel ports of both the source and target
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systems. The most common values are <literal>io=0x378</literal>,
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<literal>irq=7</literal>.
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</para>
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<sect2>
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<title>Requirements</title>
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<itemizedlist>
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<listitem><para>
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A target computer, called <emphasis>target</emphasis>, where Debian will be
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installed.
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</para></listitem>
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<listitem><para>
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System installation media; see <xref linkend="installation-media"/>.
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</para></listitem>
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<listitem><para>
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Another computer connected to the Internet, called <emphasis>source</emphasis>,
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that will function as the gateway.
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</para></listitem>
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<listitem><para>
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A DB-25 Null-Modem cable. See the
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<ulink url="&url-plip-install-howto;">PLIP-Install-HOWTO</ulink> for more
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information on this cable and instructions how to make your own.
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</para></listitem>
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</itemizedlist>
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</sect2>
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<sect2>
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<title>Setting up source</title>
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<para>
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The following shell script is a simple example of how to configure the
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source computer as a gateway to the Internet using ppp0.
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<informalexample><screen>
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#!/bin/sh
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# We remove running modules from kernel to avoid conflicts and to
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# reconfigure them manually.
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modprobe -r lp parport_pc
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modprobe parport_pc io=<replaceable>0x378</replaceable> irq=<replaceable>7</replaceable>
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modprobe plip
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# Configure the plip interface (plip0 for me, see dmesg | grep plip)
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ifconfig <replaceable>plip0 192.168.0.2</replaceable> pointopoint <replaceable>192.168.0.1</replaceable> netmask 255.255.255.255 up
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# Configure gateway
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modprobe iptable_nat
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iptables -t nat -A POSTROUTING -o <replaceable>ppp0</replaceable> -j MASQUERADE
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echo 1 > /proc/sys/net/ipv4/ip_forward
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</screen></informalexample>
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</para>
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</sect2>
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<sect2>
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<title>Installing target</title>
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<para>
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Boot the installation media. The installation needs to be run in
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expert mode; enter <userinput>expert</userinput> at the boot prompt.
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If you need to set parameters for kernel modules, you also need to
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do this at the boot prompt. For example, to boot the installer and
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set values for the <quote>io</quote> and <quote>irq</quote> options
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for the parport_pc module, enter the following at the boot prompt:
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<informalexample><screen>
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expert parport_pc.io=<replaceable>0x378</replaceable> parport_pc.irq=<replaceable>7</replaceable>
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</screen></informalexample>
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Below are the answers that should be given during various stages of
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the installation.
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</para>
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<orderedlist>
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<listitem><para>
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<guimenuitem>Load installer components from CD</guimenuitem>
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</para><para>
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Select the <userinput>plip-modules</userinput> option from the list; this
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will make the PLIP drivers available to the installation system.
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</para></listitem>
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<listitem><para>
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<guimenuitem>Detect network hardware</guimenuitem>
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</para>
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<itemizedlist>
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<listitem><para>
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If target <emphasis>does</emphasis> have a network card, a list of driver
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modules for detected cards will be shown. If you want to force &d-i; to
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use plip instead, you have to deselect all listed driver modules.
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Obviously, if target doesn't have a network card, the installer will not
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show this list.
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</para></listitem>
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<listitem><para>
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Because no network card was detected/selected earlier, the installer will
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ask you to select a network driver module from a list.
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Select the <userinput>plip</userinput> module.
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</para></listitem>
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</itemizedlist>
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</listitem>
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<listitem><para>
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<guimenuitem>Configure the network</guimenuitem>
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<itemizedlist>
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<listitem><para>
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Auto-configure network with DHCP: No
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</para></listitem>
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<listitem><para>
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IP address: <userinput><replaceable>192.168.0.1</replaceable></userinput>
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</para></listitem>
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<listitem><para>
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Point-to-point address:
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<userinput><replaceable>192.168.0.2</replaceable></userinput>
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</para></listitem>
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<listitem><para>
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Name server addresses: you can enter the same addresses used on
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source (see <filename>/etc/resolv.conf</filename>)
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</para></listitem>
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</itemizedlist>
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</para></listitem>
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</orderedlist>
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</sect2>
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</sect1>
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