I have the
03:00.0 Network controller: Intel Corporation Centrino Wireless-N 2200 (rev c4)
How do I find out if that card/driver support 5 GHz?
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Find out the interface name, by running
$ iwconfig eth0 no wireless extensions. lo no wireless extensions. wlan0 IEEE 802.11bgn ESSID:"EvanCarroll" Mode:Managed Frequency:2.437 GHz Access Point: D8:50:E6:44:B2:C8 Bit Rate=19.5 Mb/s Tx-Power=15 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=61/70 Signal level=-49 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:1 Invalid misc:80 Missed beacon:0
In this case it is
wlan0, then run
iwlist <interface> freq,
$ iwlist wlan0 freq wlan0 13 channels in total; available frequencies : Channel 01 : 2.412 GHz Channel 02 : 2.417 GHz Channel 03 : 2.422 GHz Channel 04 : 2.427 GHz Channel 05 : 2.432 GHz Channel 06 : 2.437 GHz Channel 07 : 2.442 GHz Channel 08 : 2.447 GHz Channel 09 : 2.452 GHz Channel 10 : 2.457 GHz Channel 11 : 2.462 GHz Channel 12 : 2.467 GHz Channel 13 : 2.472 GHz Current Frequency:2.437 GHz (Channel 6)
None of these channels are outside of 2.4 GHz. It does not support 5 GHz.
If you're trying to discover what your card supports,
iw phy is a nice solution with a lot more information (including supported bands).
iwlist is showing more what's available and/or allowed in your locale, what was disabled due to DFS channels, etc., not what your device supports. From the
iwlist man page:
freq[uency]/channel Give the list of available frequencies in the device and the number of defined channels. Please note that usually the driver returns the total number of channels and only the frequencies available in the present locale, so there is no one-to-one mapping between frequencies displayed and channel numbers.