AIUI you have a router which will either be performing DHCPv6 or SLAAC (stateless address auto-configuration).
In either case, this router will be issuing the prefix (first /64) to other devices.
If you change providers, you have to modify things on the router.
With NAT66, what changes?
- no need to modify DHCPv6 (or SLAAC)
- but you still need to change things on the router
i.e. you still need to change things on the router.
I'm struggling to see why NAT66 helps in your renumbering case.
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