disabling/fixing "disabling multicast to unicast failed" errors ?

[michael-dev at fami-braun.de]

Hi,

multicast to unicast is a recent addition to the kernel. Your kernel refuses the setting with EBUSY, whereas ENOTSUPP would be expected if your kernel or driver does not implement this. There had been a patch draft around that errorneously reported EBUSY but that draft had not been accepted upstream.
So which kernel version and driver is this trace from?

Regards,
M. Braun

Am 29. März 2017 18:12:06 MESZ schrieb PGNet Dev <pgnet.dev at gmail.com>:
>I've compiled/installed
>
>	hostapd -v
>		hostapd v2.7-devel-hostap_2_6-871-g0b287a2+
>		User space daemon for IEEE 802.11 AP management,
>		IEEE 802.1X/WPA/WPA2/EAP/RADIUS Authenticator
>		Copyright (c) 2002-2017, Jouni Malinen <j at w1.fi> and contributors
>
>On exec, it works -- I've got connectivity, etc.
>
>Logs, however, show instances of "disabling multicast to unicast
>failed" at each start/stop,
>
>	Mar 29 09:00:46 test hostapd[27104]: wlp0s31d1u3: interface state
>ENABLED->DISABLED
>	Mar 29 09:00:46 test hostapd: wlp0s31d1u3: STA 10:31:d4:c3:22:a4 MLME:
>MLME-DEAUTHENTICATE.indication(10:31:d4:c3:22:a4, 1)
>	Mar 29 09:00:46 test hostapd[27104]: wlp0s31d1u3: AP-STA-DISCONNECTED
>10:31:d4:c3:22:a4
>!!	Mar 29 09:00:46 test hostapd[27104]: nl80211: disabling multicast to
>unicast failed with -16 (Device or resource busy) on interface
>wlp0s31d1u3
>	Mar 29 09:00:46 test hostapd[27104]: wlp0s31d1u3: AP-DISABLED
>	Mar 29 09:00:46 test hostapd[27104]: wlp0s31d1u3:
>CTRL-EVENT-TERMINATING
>	Mar 29 09:00:46 test hostapd[27104]: nl80211: deinit
>ifname=wlp0s31d1u3 disabled_11b_rates=0
>	Mar 29 09:00:47 test hostapd[5894]: Configuration file:
>/etc/hostapd/hostapd.conf
>	Mar 29 09:00:47 test hostapd[5894]: wlp0s31d1u3: interface state
>UNINITIALIZED->COUNTRY_UPDATE
>	Mar 29 09:00:47 test hostapd[5894]: Using interface wlp0s31d1u3 with
>hwaddr 02:d1:ff:34:15:10 and ssid "testWiFi"
>!!	Mar 29 09:00:47 test hostapd[5894]: nl80211: disabling multicast to
>unicast failed with -16 (Device or resource busy) on interface
>wlp0s31d1u3
>	Mar 29 09:00:47 test hostapd[5894]: wlp0s31d1u3: interface state
>COUNTRY_UPDATE->ENABLED
>	Mar 29 09:00:47 test hostapd[5894]: wlp0s31d1u3: AP-ENABLED
>
>I've tried
>
>	multicast_to_unicast=0
>	multicast_to_unicast=1
>
>& 
>
>	 #multicast_to_unicast=0
>
>in the config file -- no change.
>
>What config or build change is required to fix the error -- either in
>logs, &/or the root cause?
>
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