Can't seem to use 5GHz APs with Intel wireless

[Adam]

On Sun, Jun 3, 2018 at 9:53 AM, Dhananjay Balan <mail at dbalan.in> wrote:

> On Sat, Jun 02, 2018 at 12:37:12AM +0200, Christoph Moench-Tegeder wrote:
> > Did you try adding "mode 11a" to select 5GHz band? (This might be
> > out-of-date, as my WiFi stuff is all on 11) (currently I'm also
> > using 2.4GHz only, for compatibility with some devices and the fact
> > that I have quite some trouble running 2.4GHz and 5GHz from the same
> > interface at the same time).
>
> I did a bit more testing, I have to admit that I am not well versed in
> wifi internals.
>
> 1. ifconfig wlan0 list aps shows my aps having rate 54M (Im not entirely
> sure what this means).
>    But however when I connect to it, it shows up as 11g
>
> wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
> 1500
>         ether a4:4e:31:02:70:3c
>         inet 192.168.23.111 netmask 0xffffff00 broadcast 192.168.23.255
>         nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
>         media: IEEE 802.11 Wireless Ethernet MCS mode 11ng
>         status: associated
>         ssid LA03 channel 6 (2437 MHz 11g ht/20) bssid 52:d9:e7:47:c0:c2
>         regdomain FCC4 country DE authmode WPA2/802.11i privacy ON
>         deftxkey UNDEF AES-CCM 2:128-bit txpower 30 bmiss 10 scanvalid 60
>         protmode CTS ampdulimit 64k ampdudensity 8 -amsdutx amsdurx shortgi
>         -stbc -ldpc wme roaming MANUAL
>         groups: wlan
>

I do not believe the response you are replying to actually addressed 5gz
which is different than mode.  You may be able to achieve better speeds
using channel parameters.  man ifconfig.

A simple test is to have your AP present SSID of 2.4 and 5 as different
names.  If the 5 doesn't show in the above command, 5 isn't working.


> 2. Adding mode 11a to rc.conf didn't change anything. Still connects to
> 2.4Ghz band.
>

Yup


> 3. ifconfing wlan0 scan still doesn't show my 5Ghz only APs (at least some
> I tested)
>

I don't believe the iwn driver is capable of 5gz.  At least mine doesn't
work on CURRENT.


> Also, what does 11a mean? shouldn't it be 11n?
> -
> dbalan
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-- 
Adam