Two months ago, we published Everything you need to know about IPv6, telling you the following about firewalling IPv6 in relationship to the Network Address Translation that is common in today's IPv4 home routers.
If you have a router or home gateway that supports IPv6, make sure that it, too, filters IPv6. A stateful filter that allows outgoing connections and return traffic, but not incoming connections is closest to the IPv4 NAT filtering functionality.
This is in line with the recommendations in a document that the Internet Engineering Task Force's IPv6 Operations (v6ops) working group is developing:
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