netdev - Kernel sends multicast groups to sockets that did not subscribe to the MC group

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Message-ID: <alpine.DEB.1.10.0904131704120.3517@qirst.com>
Date:	Mon, 13 Apr 2009 17:06:08 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	netdev@...r.kernel.org
Subject: Kernel sends multicast groups to sockets that did not subscribe to
 the MC group

I ran two processes listening to two multicast groups:

One listening for 239.0.0.51 and the other on 239.0.0.50. Both are
listening on the same port.

If I send a multicast message to 239.0.0.50 then both receive it. Why is
the process listening to 239.0.0.51 receiving the multicast message send
to 239.0.0.50?

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