Unregistered Multicast Filtering vs. NDP Protocol for IP V6 Ping SG300

Hi everybody,
we are running several switches of the SG 300 Series all with Firmware sx300_fw-14088.
We are having a setup that uses a lot of Multi Cast so we use the IGMP Feature of the Switch and enable unregistered multicast filtering.
However: if we enable unregistered multicast filtering, we cannot get a Ping V6 to work. We know, that the basis is the NDP protocol to resolve mac addresses to IP v6.
It seems as if the switch thinks that the multicast based NDP protocotol is unregistered multicast.
Any suggestions?
an example configuration configuration is attached to this mail:

There are strict rules to map L3 IPv6 Addresses and L3 IPv4 addresses to L2 Mac Addresses. At the end those Mac Addresses are Multicast addresses independent of their roots (IPv6 or IPv4). Of course you are able to keep them separate from each other (00-01-FF vs. 33-33-FF), but both have the I/G-Bit set to 1 and for a Switch those addresses are multicasts.
It might be that you are using the default Multicast properties: Forwarding Method for IPv6 and Forwarding Method for IPv4 equals MAC Group address. Therefore, the Switch should use the Multicast Mac addresses as an IGMP Snooping filter as well. The Multicast Mac Address which is used in ICMP Type 135 (Neighbor Solicitation) of course is not registered via IGMP and will get blocked. This is only a guess, but it should be worth the effort to Switch the forwarding method to IP Group address.
Cheers,
@gar

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