There is misunderstanding here, perhaps about what the OP asked. I’ve interpreted the question to be why there are two different ipv6 addresses. I suspect you’ve interpreted it to be why is there a ipv4 and ipv6 addresses. At least I hope so.
I gather that insulting internet randos is what you do for a living.
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Cgnat is for ipv4, has nothing to do with ipv6. Suggest reading up on ipv6.
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There is misunderstanding here, perhaps about what the OP asked. I’ve interpreted the question to be why there are two different ipv6 addresses. I suspect you’ve interpreted it to be why is there a ipv4 and ipv6 addresses. At least I hope so.
I gather that insulting internet randos is what you do for a living.
How can I tell if IPv6 is CGNATed ?
IPv6 should never be behind NAT which is a hack to extend the address space of Ipv4.
CGNAT is a nasty hack to work around the shortage of IPv4 addresses. It’s not used with IPv6.
It all is if you’re getting both. You’re sharing IPs with many different devices at the same time. That’s how it works.
Read up on it.