First thing you should do is shut them down if your not using them. If for some reason you have to have them up, make sure the interface configurations are empty. No VLANS, no DHCP, etc.. Having said this brings up my first recommendation, shut the ports down.
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...