Hi All,
When using wpa_supplicant in IBSS mode on 5GHz channels, the
"disable_ht" & "disable_ht40" parameters are ignored.
Created IBSS links are always fixed to HT40, independent of this
parameters value.
Currently I use the patch below to force it to HT20.
It seems the wrong case is being selected due to a bug.
The "disable_sgi" parameter does work correctly.
Hardware used for testing:
2x Gateworks Laguna CNS3xxx + AR9280 (UBNT SR71-15)
2x Gateworks Ventana IMX-6 + AR9300 (Compex WLE350NX)
Branch tested:
Master @ June 1st 2016
Following setup:
* 2 identical devices
* IBSS mode using wpa_supplicant WPA2 (Config file below)
* 2 meter apart
* Tested on all possible 5GHz channels
Patch created to force HT20:
--- a/wpa_supplicant/wpa_supplicant.c
+++ b/wpa_supplicant/wpa_supplicant.c
@@ -1981,6 +1981,9 @@ void ibss_mesh_setup_freq(struct wpa_sup
break;
}
+ //Force HT20
+ freq->sec_channel_offset = 0;
+
wpa_scan_results_free(scan_res);
}
wpa_supplicant config file:
ctrl_interface=DIR=/tmp/run/wpa_supplicant GROUP=root
update_config=1
ap_scan=2
country=XA
beacon_int=100
network={
ssid="ROBOT100"
frequency=5500
bssid=CC:A5:4B:83:7E:A9
mode=1
disable_ht=0
disable_ht40=1
disable_sgi=1
proto=WPA2
key_mgmt=WPA-PSK-SHA256
pairwise=CCMP
group=CCMP
psk="MyPasswordIsHere"
}
Country XA definition:
country XA: DFS-UNSET
(2402 - 2494 @ 40), (N/A, 30), (N/A)
(5180 - 5835 @ 160), (N/A, 30), (N/A)
(57240 - 63720 @ 2160), (N/A, 40), (N/A)
If more information is required, please let me know.
Thanks,
Koen Vandeputte
nCentric Europe
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