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> I don't see a reason why my machine addresses should change over time

You can still use fixed addresses locally if you want, its not like IPv6 is forcing you to use the prefix assigned if you just want to communicate locally over never-changing addresses.

You can have your computers be fd01::1, fd01::2, fd01::3, etc, and talk to everything on their local addresses when wanting to stay local. And then when they want to talk on the public internet they can just use whatever public addresses like 2600:1700:53c2:2573:4c:c001:dead:beef based on whatever prefix your ISP gives you.

Its not like your devices have to only have a single IP address.

by ninkendo2 hours ago|

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Source address selection still favors GUA over ULA by default in every major operating system… If you run both you’re almost certainly going to see a lot of GUA addresses in logs where you only allow LAN traffic. Especially if you’re using mDNS/.local for your hostnames. The only way to be sure your internal stuff only ever uses ULA’s is to not give them GUA’s, and now you’re doing NAT.

(I don’t personally run my network as ULA-only, I do ULA+GUA as you describe, but I had to basically give up on being able to reliably tie traffic logs to a known source… hosts in my LAN always seem to use a GUA to talk to each other when discovering over mDNS, which of course means they use privacy addresses by default. My ULA uses DHCP so that I can get stable addresses and know who is who, but it’s useless when things just decide to use the GUA anyway.)