Multicast stops working after second group rekey

[Markus]

Hello everyone,

I asked a month ago for help but haven't received any feedback yet.
Do I miss something? Is this the wrong address for my request?

Thanks,
Markus

Am Freitag, 26. Juli 2024, 16:06:40 MESZ schrieb Markus:
> Hello,
>
> I am running a hostapd with following setup:
>
> interface=wlan0
> bridge=br0
> driver=nl80211
> hw_mode=g
> channel=5
>
> ssid=xxx
> auth_algs=1
> wnm_sleep_mode=1
> beacon_prot=1
> ieee80211w=1
> wmm_enabled=1
> #wmm_ac_* like in example
> ap_isolate=1
> ieee80211n=1
> ht_capab=[HT40-][GF][SHORT-GI-20][SHORT-GI-40]
> dynamic_vlan=1
> per_sta_vif=1
> wpa=2
> wpa_psk_file=/etc/hostapd/hostapd.wpa_psk
> wpa_key_mgmt=WPA-PSK
> rsn_pairwise=CCMP
>
> In general it works. But I noticed that after two days multicast
> communication fails for all stations. (mdns discovery stops working.)
> At the time it fails I noticed in the hostapd log the rekey entries. The
> default is a rekey every 24h. So I changed it to 5 minutes to check:
> wpa_group_rekey=300
>
> Now multicast failed after 10 minutes. (So the first rekey after 5 minutes
> worked, but the second and any further rekey succeed according to log, but
> multicast does not work.)
>
> (I could increase rekey interval or disable it all together, but I guess
> thats not recommended. ;) )
>
> Deauthenticating the clients with "hostapd_cli deauthenticate" sometimes
> recovers multicast for up to 10 minutes.
> Not sure why it does not recover everytime.
>
>
> Hardware is a ALFA  AWUS036ACHM with mediatek mt76.
> Kernel is 6.6.37, linux-firmware from July.
> Recently updated hostapd to latest git version.
> All stations are affected, at the moment android devices and various smart
> home devices from different brands.
>
> Any idea what the problem could be?
> Is it a misconfiguration or some bug?
>
> Any help is highly appreciated.
>
> Thank you,
> Markus
>
>
>
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