Icotera wrote

I would like to discard unknown IPv4 multicast traffic because I often have situations when there are groups with no members. I cannot enable it for IPv4 only, because the UI/CLI doesn't allow me to. If I enable the option for IGMP and MLD, however, SLAAC stops to work. It looks like a bug to me, because ICMPv6 is one of the things that should NEVER be dropped. How can I fix my issue?

Hi Icotera：

    My old Jetstream Switch TL-SG3424 V1 met this issue also.

    Due to this is the old Switch, TP_Link do not support beta to me.

    I suggest you contact with TP-Link technical support. Maybe they can support beta firmware to you.