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This sounds useful, but isn't this the problem that ipv6 is supposed to solve with 128bit addresses? (I'm not really familiar with why IPv6 never really seemed to take off -- does NAT block incoming IPv6 traffic? (I guess that's the other thing -- even though my devices all seem to have IPv6 addresses I can't recall ever using them))

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IPV6 addresses are still addresses. They get assigned to your device, and change as you change networks.

Iroh addresses are (currently Ed25519) keys. They are not scarce, so you can create them on demand and keep them as you move from one network to another.

If IPv6 was everywhere I guess the hole punching feature of iroh would become less important, but the dial by key feature would remain just as important.

IPv6 solves a lot of it, and maybe in another 20 years we can rely on it.

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