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2 hours of debugging later, I still have no idea why an @OpenwrtH with smcroute (v2.4.4-1) running on 3 VLAN interfaces on a single trunk to a @mikrotik_com CRS326 tagged-only port work will only receive IGMP packets when 'multicast-router=permanent' is set for this port. Help?
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forum.turris.cz/t/sonos-speaker-on-a-separate-network-with-igmpproxy/12245/3 for some more details (with @turris_cz, but should be similar for all @OpenwrtH devices with smcroute). It now works when forcing multicast-router on RouterOS, but I am confused why this is necessary.