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From: =?UTF-8?Q?Marcin_=C5=9Alusarz?= <marcin.slusarz@gmail.com>
Date: Tue, 11 Jun 2024 13:10:26 +0200
Message-ID: <CA+GA0_vA1KRRyvnURfdjwVv5JBkRhkjdQnwrRWWKmZs9_z-X1w@mail.gmail.com>
Subject: Re: rtw88 multicast failure in AP mode
To: Ping-Ke Shih <pkshih@realtek.com>
Cc: "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>, Kalle Valo <kvalo@kernel.org>, 
	=?UTF-8?Q?Marcin_=C5=9Alusarz?= <mslusarz@renau.com>
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wt., 11 cze 2024 o 04:32 Ping-Ke Shih <pkshih@realtek.com> napisa=C5=82(a):
>
> Marcin =C5=9Alusarz <marcin.slusarz@gmail.com> wrote:
> > Let's assume we have 3 systems: A and B use 8821CU chip, and C uses
> > another chip from a different vendor.
> >
> > If A is in AP mode and A and B use the rtw88 driver, pinging A from B
> > and C by local name doesn't work because name resolution fails: avahi
> > on B and C sends a multicast request to resolve A.local, A sees it and
> > responds, but neither B nor C sees the response.
> >
> > In the same situation, but with A and B using the rtl8821cu driver
> > (from https://github.com/morrownr/8821cu-20210916.git), everything
> > works - B and C see A's response and can resolve A.local.
> >
> > If C is in AP mode, resolving C from A and B also works.
> >
> > This leads me to believe there's something wrong with rtw88 when
> > sending multicast packets in AP mode.
>
> Have you captured air packets sent by C (AP mode)? (To check if TX proper=
ly.)

Yes, I see packets in both directions on both C and A if C is in AP mode.

> Have you tried non-secure connection? (To check if encryption properly.)

Nothing changes - rtw88 in AP mode sends multicast packets, but other
devices don't see them.