Hello,
thanks for your answer.
I'm creating the connection on band wifi band a using this command:
nmcli con add type wifi ifname wlan0 autoconnect yes ssid $(hostname)
802-11-wireless.mode ap 802-11-wireless.band a 802-11-wireless.channel 100
ipv4.addresses 192.168.201.1/24 ipv4.method shared wifi-sec.key-mgmt wpa-psk
wifi-sec.psk TEST12345
I had a few problems to bring up the access point first, but when I changed the
802-1x.auth-timeout to 90 seconds (CAC time) and send the correct country code
to wpa_supplicant over dbus the access point is coming up as it should.
Everything is fine until I need to switch the channel because a radar event is
detected by the driver.
To simulate the radar event I use a debug feature of the WLink8 driver. I use
the debugfs and write the channel to a specific file:
echo 100 > /sys/kernel/debug/ieee80211/phy0/wlcore/wl18xx/radar_detection
for triggering a radar event on channel 100. We used this in the past with
hostapd and it worked really good.
I'm not sure how I can tell wpa_supplicant to use wlan0 instead of
p2p-dev-wlan0. I only create the nmcli connection and I think the network
manager is then configuring wpa_supplicant over dbus.
Thanks
Nadja
-Ursprüngliche Nachricht-
Von: Beniamino Galvani
Gesendet: Montag, 10. Mai 2021 08:59
An: Stärk Nadja
Cc: networkmanager-list@gnome.org
Betreff: Re: AccessPoint 5GHz DFS Channel Radar Detection Failure [ NICHT
VERSCHLUESSELT ] [ SIGNATUR_UNPRUEFBAR ]
On Wed, May 05, 2021 at 09:16:44AM +0000, Stärk Nadja wrote:
> Hello,
>
> I'm working with NetworkManager v1.22.8 and face some issues with my 5 GHz
> access point.
>
> I need to create it on DFS channel 100 and when a radar event is detected the
> channel should be switched.
>
> Debug output of wpa_supplicant is enabled.
> If I send a radar event through the debugfs to channel 100 now, I can see
> that it was received by wpa_supplicant:
>
> nl80211: Event message available
>
> nl80211: Drv Event 94 (NL80211_CMD_RADAR_DETECT) received for
> p2p-dev-wlan0
>
> nl80211: DFS event on freq 5500 MHz, ht: 1, offset: 0, width: 1, cf1:
> 5500MHz, cf2: 0MHz
>
> p2p-dev-wlan0: Event DFS_RADAR_DETECTED (42) received
Hi, the event is detected on p2p-dev-wlan0, which is a P2P interface; probably
it should be on wlan0 instead. How do you simulate the event?
> But the channel is not switched.
>
>
> I made some debugging in wpa_supplicant (v2.9) and figured out that the
> function wpas_ap_event_dfs_radar_detected in ap.c instantly returned because
> the wpa_s->ap_iface and the wpa_s->ifmsh is empty.
>
>
>
> Is the NetworkManager able to handle a fully working 5 GHz access point? Do I
> just need to add some extra configurations?
Yes, I think it should if you set property 'wifi.band' to 'a'.
Beniamino
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