I have a fit-PC server with Debian GNU/Linux (Lenny). I would like to use it as a wifi access point since my Linksys WRT54GS has become unstable.
I have a USB Ralink wifi NIC. When I insert the card to USB I can see this with lsusb:
Bus 001 Device 002: ID 148f:2573 Ralink Technology, Corp. RT2501/RT2573 Wireless Adapter
I have tried following various HOWTOs on using wifi card as AP in Linux, however, it seems that the card cannot go into monitor mode. I believe this is because I must use a newer driver or upload non-free firmware or something like that.
I have tried installed wicd, but it does not help.
I bought this wifi adapter because I was told that it is one of the most common used Linux supported wifi cards that can be used as access point and a lot of other stuff.
So my question is: How do I set up this USB wifi card as wireless access point in Debian Lenny?
Best Answer
According to linuxwireless.org the in-kernel Ralink drivers do support AP mode on the older chipsets, both PCI and USB.
If you're still using Debian Lenny, you will have an older version of the drivers which might be affected by bugs or other limitations. As Lenny is currently the oldstable, I would recommend upgrading to the current stable distribution aka Squeeze, if that's possible.
Otherwise, compat-wireless provides a chance to install the most recent drivers on a system without disturbing the rest of the system (this holds true for Squeeze as well)
Debian does not provide ready-made packages for compat-wireless so you will have to download it from linuxwireless.org and build it yourself. That's very easy, the linked page explains the simple few steps needed to do it. Also, the operation can be reverted.
As far the firmware goes, there have been reports of the package in Debian being quite outdated, that is true for squeeze too. Luckily, you can just get the most recent firwmares directly from Ralink.