From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Bauer <sb@plzk.de>
Subject: [SOLVED]Re: ip link macvtap interface not processing specific ipv6
 multicast traffic without promiscuous mode on
Date: Wed, 15 Apr 2015 10:38:56 +0200
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It was the privacy extension enabled on the windows hosts.

So it was sending out from addresses the KVM HOST is not member of the
multicast group.

disabled it with netsh interface ipv6 set privacy state=disabled

Stefan