Question : 802.11ac - channel & config

[Janusz Dziedzic]

On 23 June 2014 13:09, Charles Moulliard <ch007m at gmail.com> wrote:
> Hi,
>
> Something goes wrong with my config of hostapd 2.2 on a linux kernel
> (3.14.7-200.fc20.x86_64). I have plugged an Edmix AC200 (WIFI USB) and it
> works fine using this driver
> (https://github.com/abperiasamy/rtl8812AU_8821AU_linux) and setup (hostapd
> 2.2 + dnsmaq) but I can't change the channel to a value higher than 48 and
> bitrate is around 24Mbits/s (measured with iperf) between this machine and a
> client (=MacBook pro)
>
> What is the issue ?
>
64 - is DFS channel, so required HW that support radar detection +
hostap config (country_code=, ieee80211d=1, ieee80211h=1)

> sudo ./hostapd config_test.conf
> Configuration file: config_test.conf
> wlp0s20u2: IEEE 802.11 Configured channel (64) not found from the channel
> list of current mode (2) IEEE 802.11a
> wlp0s20u2: IEEE 802.11 Hardware does not support configured channel
> Could not select hw_mode and channel. (-3)
>
> More debug output available here :
> https://gist.github.com/cmoulliard/81aa9c7dc60c366f4724
>
> iwlist wlp0s20u2 channel
> wlp0s20u2  32 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
>           Channel 36 : 5.18 GHz
>           Channel 40 : 5.2 GHz
>           Channel 44 : 5.22 GHz
>           Channel 48 : 5.24 GHz
>           Channel 52 : 5.26 GHz
>           Channel 56 : 5.28 GHz
>           Channel 60 : 5.3 GHz
>           Channel 64 : 5.32 GHz
>           Channel 100 : 5.5 GHz
>           Channel 104 : 5.52 GHz
>           Channel 108 : 5.54 GHz
>           Channel 112 : 5.56 GHz
>           Channel 116 : 5.58 GHz
>           Channel 120 : 5.6 GHz
>           Channel 124 : 5.62 GHz
>           Channel 128 : 5.64 GHz
>           Channel 132 : 5.66 GHz
>           Channel 136 : 5.68 GHz
>           Channel 140 : 5.7 GHz
>           Current Frequency:5.24 GHz (Channel 48)
>
Please use iw list instead.

> dabou at localhost Temp$ iwconfig
>
> wlp0s20u2  IEEE 802.11a  ESSID:"fuselab"  Nickname:"<WIFI at REALTEK>"
>           Mode:Master  Frequency:5.24 GHz  Access Point: D8:50:E6:F3:96:C7
>           Bit Rate:54 Mb/s   Sensitivity:0/0
>           Retry:off   RTS thr:off   Fragment thr:off
>           Power Management:off
>           Link Quality=66/100  Signal level=48/100  Noise level=0/100
>           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
>           Tx excessive retries:0  Invalid misc:0   Missed beacon:0
>
> Config used :
>
> interface=wlp0s20u2
> ssid=fuselab
> #channel=48
> channel=64
>
> # WPA and WPA2 configuration
> macaddr_acl=0
> auth_algs=1
> ignore_broadcast_ssid=0
> wpa=3
> wpa_passphrase=fuselab987
> wpa_key_mgmt=WPA-PSK
> wpa_pairwise=TKIP
> rsn_pairwise=CCMP
>
> # Hardware configuration
> driver=nl80211
> wme_enabled=1
> ieee80211n=0
> ieee80211ac=1
> hw_mode=a
>
Here you can use (v)ht40/vht80 - as I remember correctly 80211ac=1
required also 80211n=1.

BR
Janusz