So, here goes:

I have installed CentOS 6, and, after much trouble and a whole wasted day, managed to get a D-Link DWA-140 wireless card working. Now, I want to replace it with a Linksys WUSB54G network card. Since they both have the same chipset vendor, Ralink, I assumed the steps would be similar, but I was wrong. First, the drivers from the ralink website(http://www.ralinktech.com/support.php?s=2), namely RT2500USB(RT2571/RT2572), will not, for whatever reason, compile. I followed the instructions to the letter and make complains about all sorts of errors like:
This is my lsusb output:
I can only imagine I'm missing some files, or that somebody couldn't bother to make it actually work. Nonetheless, I read on some page that there is a project called rt2xx00 which aims to make these kinds of cards work, and the drivers are already included. So, I check the output of lsmod, and, surprise surprise, drivers are alreay loded in the kernel:
To be sure, I tried to insmod the rt2500usb.ko file, and it said that the module is already loaded.

So, my question is: How can I create a network interface for the USB Wireless card, because it seems that the driver is already loaded? Or should I try to go with the ralink drivers that do not compile and fix them somehow(which I have no idea how)?

I'm sorry if i posted in the wrong subcategory. Thanks in advance for your replies

Hello,

Since you have a Ralink chipset, I think you should read into compat-wireless. It's what I use for all of my devices, due to being the newest worked on, cross compatibility, and supported injection and monitor modes. Pretty much, these would be the newest worked on drivers for all chipsets that are supported under the compat-wireless package. Read my blog about it, as if you do go that route, you can add a patch that supports the extra features I talked about before.

Cheers,

Josh