&gt; For example, comcast uses prefix delegation to give you are &#x2F;60 which your router (pfsense in my case) then uses for the internet network (it carves out a &#x2F;64). However, this prefix changes! As it is not a statically assigned prefix, my internal devices renumber whenever it changes, it would make it a huge pain to get a consistent mapping for my internal devices (media server, printer, etc) were I to go ipv6 only.<p>Part of the point of IPv6 is that your addresses reflect the real network topology - when your upstream changes, your addresses change. The right thing is to ensure that your router is also updating DNS for your internal devices, and use names to refer to them. You shouldn&#x27;t expect anything to have a truly static IPv6 address.