This is not exactly true. There are many tricks in the NAT traversal toolkit, depending on your configuration it can be fairly simple to work around. In every c

This is not exactly true. There are many tricks in the NAT traversal toolkit, depending on your configuration it can be fairly simple to work around. In every case where you use NAT, you also use a firewall. 100% of consumer IPv6-capible routers block unsolicited inbound IPv6 by default. It's not something you need to worry about unless you are hosting, and in that case your concerns are the same as if you're using IPv4.