From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Subject: Re: [PATCH] make ipv4 multicast packets only get delivered to sockets	that are joined to group
Date: Thu, 14 Sep 2006 00:20:29 +0400
Message-ID: <20060913202029.GA4666@ms2.inr.ac.ru>
References: <1158156835.15449.40.camel@dantu.rdu.redhat.com> <OF0C86B64A.DE64FE98-ON882571E8.004F57A7-882571E8.004FDDED@us.ibm.com>
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Cc: Jeff Layton <jlayton@poochiereds.net>,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
	netdev-owner@vger.kernel.org
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To: David Stevens <dlstevens@us.ibm.com>
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Hello!

> IPv6 behaves the same way.

Actually, Linux IPv6 filters received multicasts, inet6_mc_check() does
this.

IPv4 does not. I remember that attempts to do this were made in the past
and failed, because some applications, related to multicast routing,
did expect to receive all the multicasts even though they did not join
any multicast addresses. So, it was left intact.

Alexey