V Sat, Sep 04, 2021 at 08:20:57PM +0200, Petr Pisar napsal(a): > Hello, > > after upgrading Linux from 5.13.13 to 5.14.0 on my router with this wireless > device: > > 03:00.0 Network controller [0280]: Qualcomm Atheros AR93xx Wireless Network Adapter [168c:0030] (rev 01) > Subsystem: Qualcomm Atheros AR93xx Wireless Network Adapter [168c:3116] > Flags: bus master, fast devsel, latency 0, IRQ 18 > Memory at 81200000 (64-bit, non-prefetchable) [size=128K] > Expansion ROM at 81220000 [disabled] [size=64K] > Capabilities: [40] Power Management version 3 > Capabilities: [50] MSI: Enable- Count=1/4 Maskable+ 64bit+ > Capabilities: [70] Express Endpoint, MSI 00 > Capabilities: [100] Advanced Error Reporting > Capabilities: [140] Virtual Channel > Capabilities: [300] Device Serial Number 00-00-00-00-00-00-00-00 > Kernel driver in use: ath9k > Kernel modules: ath9k > > which works as a WiFi accesspoint, I noticed that WiFi clients cannot use IPv6 > anymore. The problem is that the router cannot translate an IPv6 address of > the client to a MAC address. The reason is that IPv6 multicast packets used by > ICMPv6 neighbour discovery protocol do not reach the clients. In other words > the ath9k-driven device stopped transmitting multicast frames. > The same observation was reported here by Felix Fietkau in "[PATCH] Revert "mac80211: do not use low data rates for data frames with no ack flag"" <https://marc.info/?l=linux-wireless&m=163091738109000&w=2> with a proposal to revert the offending d333322361e7a099dc74df2498d3fa5fde5c4fa7 commit. -- Petr
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