I'm looking for WLAN (WiFi) chipsets or adaptors that support simultaneous dual-channel use and where this capability is exposed via the current Linux drivers. The primary use-case is to support simultaneous operation as a station on one channel and as an access-point on a different channel. This could be either:

  • Simultaneous operation on two channels in the same band (2.4GHz or 5GHz) - much preferred;
  • Simultaneous operation as a station on a channel in one band and an AP on a channel in the other band.

This would be a device where iw list would not have the restriction #channels <= 1 under "valid interface combinations".

For a bonus, mesh should be supported.

A sort of similar question (full-featured WLAN USB adaptor) was asked 5 years ago but the world has moved on since then.

  • 1
    This sounds to me like a hardware recommendation request – Jeff Schaller Jan 10 '18 at 18:06
  • Ah, thanks for that pointer, although looking at the traffic there it tends to be rather higher level in nature than what I am looking for. But if I can find a product then I just need to work out what chips it uses. – awy Jan 12 '18 at 15:04

The capability is exposed by allowing you to assign multiple network interfaces with iw dev ... add .. just like for the 1-channel case, and then making using different channels work.

For reference, I have a Asus PCE-AC55BT B1 PCEe x1 card, with Intel Corporation Wireless 8260 [8086:24f3] (rev 3a) chipset. (The Bluetooth function is exposed via an USB device).

Combinations show up under iw list as:

valid interface combinations:
  * #{ managed } <= 1, #{ AP, P2P-client, P2P-GO } <= 1, #{ P2P-device } <= 1,
  total <= 3, #channels <= 2
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We have recently started using the QCA9377 Chipset which has these capabilities. Not had much of a chance to test out performance yet.

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