Question : 802.11ac - channel & config

Charles Moulliard ch007m at gmail.com
Mon Jun 23 07:09:42 EDT 2014


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 ?

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)

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

Regards,
-- 
Charles Moulliard
Apache Committer / Architect @RedHat
Twitter : @cmoulliard | Blog :  http://cmoulliard.github.io
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