Dette afsnit forklarer hvordan Debian GNU/Linux installeres på en computer uden et Ethernetkort, men kun via en ekstern adgangspunktcomputer tilkoblet via et Null-Modem-kabel (også kaldt for Null-Printer-kabel). Adgangspunktcomputeren skal være forbundet til et netværk, som har et Debian-spejl (f.eks. til internettet).

In the example in this appendix we will set up a PLIP connection using a gateway connected to the Internet over a dial-up connection (ppp0). We will use IP addresses 192.168.0.1 and 192.168.0.2 for the PLIP interfaces on the target system and the source system respectively (these addresses should be unused within your network address space).

The PLIP connection set up during the installation will also be available after the reboot into the installed system (see Kapitel 7, Start op i dit nye Debian-system).

Before you start, you will need to check the BIOS configuration (IO base address and IRQ) for the parallel ports of both the source and target systems. The most common values are io=0x378, irq=7.

#!/bin/sh

# Vi fjerner kørende moduler fra kernen for at undgå konflikter og for at 
# konfigurere dem om manuelt.
modprobe -r lp parport_pc
modprobe parport_pc io=0x378 irq=7
modprobe plip

# Konfigurer plip-grænsefladen (plip0 for mig, se dmesg | grep plip)
ifconfig plip0 192.168.0.2 pointopoint 192.168.0.1 netmask 255.255.255.255 up

# Konfigurer adgangspunkt
modprobe iptable_nat
iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE
echo 1 
> /proc/sys/net/ipv4/ip_forward

expert parport_pc.io=0x378 parport_pc.irq=7