Hi,
4.10.6-3.g0402808-default x86_64
this kernel version does not support multicast to unicast, you can ignore that error safely.
Kernel 4.10.6 is lacking mac80211 [4,5] support for multicast to unicast and requires the interface to be down for enabling/disabling multicast to unicast [1,2,3]. Hence the error message.
Both is fixed in 4.11-rc4. Regards, M. Braun[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/wireless/nl80211.c?id=b528414ca3b7b57f4f81b7ff207e6f8ffde89d2e [2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/tree/net/wireless/nl80211.c?id=refs/tags/v4.10.6#n11817 [3] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/wireless/nl80211.c?id=refs/tags/v4.11-rc4#n11932 [4] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/tree/net/mac80211/cfg.c?id=refs/tags/v4.10.6 [5] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/mac80211/cfg.c?id=refs/tags/v4.11-rc4
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