IPv6 multicasts flooding the pfSense logs.
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It's not moving to good direction then. :)
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While I can't speak about the specific issues here, both ICMP6 and multicasts are essential parts of IPv6. For example, there is no such thing as broadcasts with IPv6. Instead, there are several types of multicasts, to specific groups. Even ARP has been replaced with solicited node multicasts. One thing that's also used extensively is MTU discovery, which involved ICMP6. MTU discovery is essential, as with IPv6 routers are not allowed to fragment packets. With IPv4, you could set the MTU to whatever and if the packet tried to pass through a router that couldn't handle the MTU, the packet would be fragmented so that the fragments could pass.
I have been running IPv6 for 7 years, including just over a year with pfSense and it works fine.
