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What if I want my devices visible on the public internet? Then I'm tied to my ISP's addresses. Or, I have to maintain both addressing schemes

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That's why I mentioned multiple addresses. The public addresses (assigned using SLAAC or DHCPv6) are for global reachability, while you use the local prefix for stable addresses within your network.

If you want stable global addresses, you should request an AS number and prefix, and choose a provider that allows you to announce it with BGP.

> and choose a provider

Lots of people don't have much choice.

Frankly, my IoT washing machine having a public IP address sounds like it'll get shut off when I don't let it online or don't pay my subscription fee.

> Lots of people don't have much choice.

Yeah but it's not like IPv4 is any better at giving you a stable public address.

Funfact my washing machine has a public ipv6 address, but egress/ingress conns to the WAN are blocked. works great.

This is also the case with IPv4.

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