netdev - Re: restoring IP multicast addresses when restarting the interface.

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Message-Id: <20120424.170004.1811627706738841106.davem@davemloft.net>
Date:	Tue, 24 Apr 2012 17:00:04 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	fbl@...hat.com
Cc:	herbert@...dor.hengli.com.au, netdev@...r.kernel.org
Subject: Re: restoring IP multicast addresses when restarting the interface.

From: Flavio Leitner <fbl@...hat.com>
Date: Tue, 24 Apr 2012 15:30:23 -0300

> On Mon, 23 Apr 2012 22:14:25 +1000
> Herbert Xu <herbert@...dor.hengli.com.au> wrote:
> 
>> On Fri, Apr 20, 2012 at 09:25:33PM -0300, Flavio Leitner wrote:
>> >
>> > Although the new behavior seems nice and save some user space
>> > work, I think it was unintentional and likely to be a bug.
>> > 
>> > What you guys think?
>> 
>> Are you talking about multicast subscriptions on the interface?
>  
> Yes.
> 
>> I don't see why they should disappear when the interface goes
>> down and then comes back up since these ultimately come from
>> application sockets which continue to exist after a down/up.
> 
> Yeah, but that's not how things used to work before, so my
> question is if the kernel should be responsible for keeping
> the subscription or the application.
> 
> If the admin puts down the interface and remove the module,
> for instance, then the multicast subscription is gone.
> Should the application monitor for that then?
> 
> David? Any thoughts?

David Stevens at IBM and Herbert at the current multicast
experts, so I will defer to them.
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