netdev - Re: bridge igmp snooping implementation

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Message-ID: <CAF1ivSZqjaWvj4JkkzM_PTBuqYSKDdkYXxijfRWdcWqaF_P4-g@mail.gmail.com>
Date:	Tue, 25 Sep 2012 23:12:00 +0800
From:	Lin Ming <mlin@...pku.edu.cn>
To:	Felix Fietkau <nbd@...nwrt.org>
Cc:	netdev <netdev@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: bridge igmp snooping implementation

On Tue, Sep 25, 2012 at 6:18 PM, Felix Fietkau <nbd@...nwrt.org> wrote:
> Hi,
>
> I'v been looking at the bridge IGMP snooping code and I noticed that it
> appears to not keep track of multicast group member IP addresses. Is
> this intentional?
>
> It seems to me that this would lead to issues when multiple members of
> the same multicast group are behind the same bridge port, and one of
> them leaves.
>
> I'm currently looking into adding a feature that allows bridge ports to
> be configured to selectively turn multicast traffic into unicast
> traffic. For this I would need to change the code to keep track of
> member IP and MAC addresses.

Good idea. This can help to resolve my problem at:
http://marc.info/?l=linux-netdev&m=134855468803809&w=2

Thanks.

>
> This helps a lot on 802.11, where unicast is often much cheaper than
> multicast, even when sending out duplicate packets (higher data rates
> and aggregation heavily reduce airtime utilization).
>
> - Felix
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