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Is moving to IPv6 worth it?
(lemmy.world)
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this post was submitted on 13 Jul 2023
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IP addressing is just a way to give a globally unique number to each device. It's just a number.
And there wasn't a real public/private distinction when the Internet was still in its infancy. Printers were indeed given "public" addresses because people needed a number for it.
If you don't want your printer to be reachable by the public Internet, use a firewall to block outside connections. If you can use NAT, you certainly can use a firewall. Heck, they are almost the same thing if you have been using the Linux kernel (iptables/nftables handle firewalling and masquerading with the same tool!)
Routability is not the same as reachability. With NAT transversal you can reach my "private" hosts all the same, although you can't route to me because I don't have a public address.