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Scenario is as follows: my laptop has 3 wifi ifaces, 2 usb (both running on driver rt2800usb and chipset Ralink RT2870/RT3070), and one embedded iwlwifi, intel chipset).

On iwconfig, both usb cards show 802.11bgn, whereas intel one shows 802.11abgn.

Yet, when I run iwlist <iface> freq, intel cards show N-band channels (36,40,...,104,...); but on both usb cards show only non-N-band channels (1..13).

So, when I set monitor mode on any of the usb cards, and try a N-band channel (as 104), it gets fixed on channel 13.

Why is this happening? How can I get them to work in 5Ghz channels?

Thank u so much!!

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  • Welcome to Security SE! I'm voting to migrate this question as it does not relate to information security. Jun 3 '18 at 19:15
  • Thanks, I certainly disagree, for it is related to wireless security.
    – glezo
    Jun 3 '18 at 19:32
  • 2
    monitor mode has information security-related uses, but the question does not have security context. Jun 3 '18 at 19:33
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Are you sure your Ralink RT2870/RT3070 chipset actually works on 5GHz channels? A quick google search tells me that the RT3070, which is the transceiver chip is 2.4 GHz only.

When a chipset advertises IEEE802.11(n) it does not necessarily mean that it supports dual band 2.4GHz and 5GHz Wi-Fi.

Typically when you look at what legacy standards the chipset supports, you normally can tell without looking into the datasheet, if an IEEE802.11(n) chipset is either only 2.4GHz or dual band.

When you only see support for the legacy 2.4 GHz IEEE802.11(b) and IEEE802.11(g) standards, then it typically is a 2.4GHz chipset.
When you additionally also observe support for the 5 GHz legacy IEEE802.11(a) standard, this typically means that your chipset supports both 2.4 and 5 GHz.

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