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Why not have a ULA and an internal dns server that rewrites the dns to the ULA address and have the external dns dynamicly updated?

One great thing about ipv6 is your not limited to 1 IP address per interface

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Doesn’t that have the same issues as IPv4 split horizon DNS? Cached DNS resolutions on a client would persist if you disconnected from the LAN - I guess you can set the TTL to be very low but I’m not sure what the right balance is there.

You aren't limited with IPv4, either (assuming you're using a capable OS)

True but it's much easier in IPv6 as it's the standard way of doing things

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