You mean the hosts behind a NEM client on the same lan? Or hosts behind 'multiple' NEM clients talking to each other? First case will work for sure (same LAN), second case requires configuration on the hub side AFAIK.
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...