[nSLUG] Configuring wireless-G on a laptop

Jack Warkentin jwark at eastlink.ca
Mon Nov 5 19:47:39 AST 2007

Hi Barry

When I installed Debian Lenny on my laptop I discovered that there were 
several drivers missing, so the first thing you need to do is make sure 
that the necessary driver is loaded.

ifconfig -a

will tell you all of the network interfaces that the kernel knows about. 
If your wireless card is not included you know that the driver is 
missing. If you still have your Windows installation available, you may 
be able to discover enough information about your wireless card from XP, 
so you can make sure to install the correct driver. It's not just the 
make and model you need but the chip set.

I have found that the easiest way to manage network cards is via the 
ifupdown package. With this method (which I believe Debian uses by 
default) each network interface is managed by a "stanza" in the 
/etc/network/interfaces file (see man 5 interfaces) and cards are 
brought up and down using the ifup and ifdown commands (see man 8 
ifup/man 8 ifdown). (The ifup and ifdown commands are normally executed 
at boot and shutdown times respectively.) The file 
/usr/share/doc/ifupdown/examples/network-interfaces.gz has some useful 
examples. My /etc/network/interfaces file consists of

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface - the Ralink rt2500 wireless interface
auto eth2
iface eth2 inet dhcp

# The (wired) gigabit ethernet interface
allow-hotplug eth1
iface eth1 inet dhcp

I hope this helps. If it gets you further along and you need some more 
info ask again.



Barry Miller wrote:
> Need a little help understanding this wireless setup.
> Some history
> I have a LINKSYS WPC54G Ver 4 Adapter with the router setup to a cable
> modem all worked with Windose XP. The other week while waiting for a
> flight I found at the newstand a LINUX MAGAZINE with DEBIAN 4.0 ETCH.
> Tired as too how slow this laptop was working under Windose I came home
> with a brand new plan. The Install worked great, the last time I install
> Linux was with Slackware3 over 28.8 modem and 486 25sx, I think I still
> have the floppies somewhere.This was a piece of cake I can't believe how
> far things have came along and this Presario 900 laptop screaming now.
> It would be great to get the wireless card working so I don't have to
> spend so much time next to the cable modem.(wife agrees)
> lspci (-gives me this my thinking the card is found )wrong
> -------------------------------------------------------------
> 02:00.0 Ethernet controller: Linksys, A Division of Cisco Systems
> [AirConn] INPROCOMM IPN 2220 Wireless LAN Adapter (rev 01)
> -----------------------------------------------------------
> interface eth0 is active
> but I have no interface for the wireless
> iwconfig
>> lo        no wireless extensions.
>> eth0      no wireless extensions.
>> sit0      no wireless extensions.
> I've been reading HOWTO'S but I'm missing something,
> Here's hoping someone can help.
> Many thanks
> Barry 
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Jack Warkentin, phone 902-404-0457, email jwark at eastlink.ca
39 Inverness Avenue, Halifax, Nova Scotia, Canada, B3P 1X6

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