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I am trying to make RaLink RT 5370 WiFi adapter run in dual mode - station as well as AP. I have tiny core linux installed on PI, built on top of 3.18.10 linux kernel version. I have been able to make dual mode work effectively on Atheros based adapter, but the same steps do not work for RT5370. Once PI connects to WiFi through wlan0 interface, I fire the below sequence of commands - 

#1. To create wlan1 in Master mode
iw dev wlan0 interface add wlan1 type __ap

#2. To assign IP to wlan1 interface
ifconfig wlan1 up 192.168.7.1

The above command fails with the error -

ifconfig: SIOCSIFFLAGS: Device or resource busy

and I cannot proceed further. The later steps include bringing up dnsmasq and hostapd.

So, is this driver limitation? And is there a workaround?

deveshchanchlani
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1 Answers1

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It looks like your H/W is not providing you a dual-mode. Actually, as my personal experience shows, ONLY 2 or 3 antennas on adapter can give you a POSSIBILITY of running in dual-mode. I saw an USB-dongle, that ACTUALLY supported it, but due to single antenna construction it's perfomance was awful in dual-mode, but very good as just AP or ST.

Alexey Vesnin
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