For a brief duration, I saw the address shown on the router on my laptop, but it’s marked as not preferred and eventually goes away. Not sure what’s happening.
note: I’m not a network person.
That's IPv6 privacy extensions, it generates random addresses.
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I was not asking about multiple IPv6 address, the Address shown on the router is nowhere to be seem on the machine. That’s my question.
The first 64 bits of the LAN IPv6 GUA (starts with 2 or 3) should match on the router and on your LAN endpoints. Since you have redacted this I can't tell if that is the case. The last 64 bits are typically chosen at random by Windows, or assigned by DHCPv6. The whole /64 range is routed to the Internet, so the endpoints can use anything for the last 64 as long as it does not conflict with another device.
ULAs (start with fd) are not important or used in most home networks though OpenWrt assigns them by default. If Windows does not have a GUA address it will not attempt to reach the v6 Internet.
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