From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Bauer <sb@plzk.de>
Subject: Re: ip link macvtap interface not processing specific ipv6
 multicast traffic without promiscuous mode on
Date: Wed, 15 Apr 2015 10:21:55 +0200
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I could narrow down the problem. Win7Prof and Windows 10 is having this
issue.

Win Client is member of the multicast group and is listening on
ff02::1:ffdf:fe88

Traffic from router -> client - captured on router:

07:41:23.104567 IP6 fe80::12fe:edff:fee6:cfa > ff02::1:ffdf:fe88: ICMP6,
neighbor solicitation, who has 2a01:198:200:8350:851e:21a7:28df:fe88,
length 32
07:41:24.099764 IP6 fe80::12fe:edff:fee6:cfa > ff02::1:ffdf:fe88: ICMP6,
neighbor solicitation, who has 2a01:198:200:8350:851e:21a7:28df:fe88,
length 32
07:41:25.099772 IP6 fe80::12fe:edff:fee6:cfa > ff02::1:ffdf:fe88: ICMP6,
neighbor solicitation, who has 2a01:198:200:8350:851e:21a7:28df:fe88,
length 32


Traffic from router to client - captured on KVM HOST

09:41:23.106444 IP6 fe80::12fe:edff:fee6:cfa > ff02::1:ffdf:fe88: ICMP6,
neighbor solicitation, who has 2a01:198:200:8350:851e:21a7:28df:fe88,
length 32
09:41:24.101647 IP6 fe80::12fe:edff:fee6:cfa > ff02::1:ffdf:fe88: ICMP6,
neighbor solicitation, who has 2a01:198:200:8350:851e:21a7:28df:fe88,
length 32
09:41:25.101718 IP6 fe80::12fe:edff:fee6:cfa > ff02::1:ffdf:fe88: ICMP6,
neighbor solicitation, who has 2a01:198:200:8350:851e:21a7:28df:fe88,
length 32

No traffic seen on KVM GUEST (win7 or win10) with wireshark

Any ideas to debug this further?

Cheers

Stefan