A Writer's View of the Linux Wireless Dream, Part 1 - page 3
Wireless Dream, Picture the Scene...
The first order of business was to get the stock card working, before I did any hardware hacking or modifications. Hardware hacking of the card will be described in the next story in this series. Since the SMC 2632 card was a Prism2 chip from Intersil, it was a given I was going to use the wlan-ng drivers. There were a few files that needed to be changed in order to get the card recognized and working properly under the Linux 2.4.18-4GB kernel.
The first file that had to be changed was /etc/modules.config. I added an entry for the wireless card.
alias wlan0 prism2_cs
And, I almost forgot to run depmod, as root.
I also created a file in /etc/sysconfig/network called ifcfg-wlan0. The card was set with DHCP, although you could easily use static IPs too. It looked like this:
DEVICE=wlan0 ONBOOT=no BOOTPROTO=dhcp USERCTL=yes DHCLIENT_SET_DOWN_LINK=yes STARTMODE=hotplug MODE="Managed" UNIQUE=""
Next was the config file in /etc/pcmcia directory. I had to make sure that the SMC2632 entry was bound to the prism2 card. It looked like:
card "SMC2632W" manfid 0x0156, 0x0002 bind "prism2_cs"
The last file that needed editing was the wlan-ng.opts file in the /etc/pcmcia directory. I had to make sure the IS_ADHOC line said "no," like this.
IS_ADHOC=no # y|n, y - adhoc, n - infrastructure
I also had to set the variables for Auth Type and DesiredSSID. I left the DesiredSSID empty so that it could just pick up the first access point it found. They looked like this:
AuthType="opensystem" # opensystem | sharedkey (requires WEP) DesiredSSID=""
I didn't bother with WEP initially because my location was fairly isolated and I could accept the risk of a neighborhood hacker. This is something you will need to determine on your own, however. If you are in a corporate setting, then you will definitely need to read the wlan-ng documentation to set this security measure up.
WEP isn't all that great anyway, since programs like Airsnort can figure out the encryption keys. VPN sounds like a good start to securing a wireless link, but, I haven't started working with that yet. Perhaps in a later article.
With all the files edited, it was time to start up the stock PCMCIA card, grab an IP and see how it worked.