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I followed these instructions and still can't get AP working on the same interface. I have these devices:

Ralink corp. RT3060 Wireless 802.11n 1T/1R is giving me an error:

RTNETLINK answers: No buffer space available

Linksys WUSB600N v2 Dual-Band Wireless-N Network Adapter [Ralink RT3572] (USB wifi adaptor):

RTNETLINK answers: Device or resource busy

these errors occur when I start second virtual interface on the same wifi device. What wifi adaptors support two virtual interfaces? What should I look for in hardware specifications? Maybe there are already known USB wifi adaptors that could work as AP and uplink at once?

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  • AFAIU, a WiFi adapter can do one or the other, not both at the same time. Perhaps get a cheap USB WiFi adapter as complement?
    – vonbrand
    Mar 5, 2014 at 19:53
  • In my situation I can have just one wifi device.
    – Jonas
    Mar 5, 2014 at 20:04

1 Answer 1

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On Linux, you can verify if (and under what conditions) your adapter supports simultaneous STA and AP operation by examining the output of

iw phy<n> info

where n is the number of your adapter, e.g. phy0.

In the output, there is a section called valid interface combinations; here is an example of an adapter that supports simultaneous STA and AP operation, but only on the same channel and using an equal broadcast interval:

[...]
valid interface combinations:
     * #{ managed } <= 1, #{ AP } <= 1,
       total <= 2, #channels <= 1, STA/AP BI must match
     * #{ managed } <= 2,
       total <= 2, #channels <= 1
[....]

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