EAP AP/VLAN: multicast not send to client

Sven Eckelmann sven at narfation.org
Tue Feb 2 03:23:31 EST 2021

On Tuesday, 2 February 2021 08:04:56 CET Sebastian Gottschall wrote:
> the standard ath10k firmware für qca988x chipsets does filter vlans.

Just to be sure that we are talking about the same thing: I am (or actually 
hostapd is) using NL80211_IFTYPE_AP_VLAN here - not 802.1Q.

> the only option for you is using the CT firmware by candelatech, which 
> does not suffer from this issue.

Thanks for the interesting hint - but there is a twist :)

I've initially tried ath10k-ct with the candelatech firmware. 
5.4.93+2021-01-11-9fe1df7d-1 with 10.4b-ct-4019-fW-13-5ae337bb1 to be more 
precise. And later also switched to the ath10k backport from 5.8.18(-1-5).
Sorry for forgetting to mention such details in the first mail.

And I've just noticed that I was always testing with the ath10k-ct firmware 
(which is the default in OpenWrt but never with the official one from Kalle's 
ath10k-firmware tree. So I've just switched to QCA4019 hw1.0 10.4-3.6-00140 
from the official tree and the problem went away. 

For Ben Greear's firmware, the only workaround which I found until now was to 
set NL80211_ATTR_MULTICAST_TO_UNICAST_ENABLED to 1 to force mac80211 to send 
multicast as unicast.

Kind regards,
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