netdev - Re:

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Message-ID: <alpine.DEB.2.00.1009271521510.14117@router.home>
Date:	Mon, 27 Sep 2010 15:23:00 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	David Stevens <dlstevens@...ibm.com>
cc:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
	netdev-owner@...r.kernel.org, Bob Arendt <rda@...con.com>
Subject: Re: 

On Mon, 27 Sep 2010, David Stevens wrote:

>         Because a querier can set the robustness value and
> query interval to anything you want. In the original report,
> he's not running a querier. The fact that it's a new group
> doesn't matter -- these are per-interface.

The per interface settings are used to force an IGMP version overriding
any information by the queriers. You would not want to enable that because
it disables support for other IGMP versions. Without the override
different version of IGMP can be handled per MC group.

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