netdev - Re: [Patch net-next v2] bridge: do not expire mdb entry as long as bridge still uses it

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Date:	Thu, 25 Apr 2013 18:07:01 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Herbert Xu <herbert@...dor.hengli.com.au>
Cc:	netdev@...r.kernel.org,
	Stephen Hemminger <stephen@...workplumber.org>,
	"David S. Miller" <davem@...emloft.net>,
	Adam Baker <linux@...er-net.org.uk>
Subject: Re: [Patch net-next v2] bridge: do not expire mdb entry as long as
 bridge still uses it

On Thu, 2013-04-25 at 16:37 +0800, Herbert Xu wrote:
> 
> As you're saying the bridge interface's subscription is expiring
> incorrectly, the question is why aren't we receiving those group
> reports from ourselves, which should be sent out periodically if
> we were subscribed to the group?

I thought IGMP report is optional as long as the multicast traffic is
still running. If it is mandatory, I don't see any IGMP report sending
out from guest, so the bug is in IPv4 multicast code rather than bridge
code.

But this can't explain why guests can communicate with each other. :)

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