Of course you are right.<p>But if you want to build a comparable architecture with IPv6, where a private Network is fully isolated from the public Internet except for a very controlled gateway, you would still need a Firewall&#x2F;Router capable of handling all the traffic.<p>Isolated (to a certain degree), private networks will not go away with IPv6, as they are a convenient security mechanism.<p>So the name for the box will change, but not it&#x27;s fundamental duty of allowing controlled traversal over network boundaries.