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

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Message-ID: <OFB8B0B17A.86602877-ON882579EA.00741868-882579EA.0075F72B@us.ibm.com>
Date:	Tue, 24 Apr 2012 14:28:33 -0700
From:	David Stevens <dlstevens@...ibm.com>
To:	David Miller <davem@...emloft.net>
Cc:	fbl@...hat.com, herbert@...dor.hengli.com.au,
	netdev@...r.kernel.org, netdev-owner@...r.kernel.org
Subject: Re: restoring IP multicast addresses when restarting the interface.

netdev-owner@...r.kernel.org wrote on 04/24/2012 02:00:04 PM:

> From: David Miller <davem@...emloft.net>

> >> 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.

I think restoring the hardware multicast filter on device up
is useful, desirable and not a bug. :-)

                                                +-DLS

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