alt Hacker News> The central idea is that a IPv4x packet is still a globally routable IPv4 packet.
That's cool and all, but end-user edge routers are absolutely going to have to be updated to handle "IPv4x". Why? Because the entire point of IPvNext is to address address space exhaustion, their ISP will stop giving them IPv4 addresses.
This means that the ISP is also going to have to update significant parts of their systems to handle "IPv4x" packets, because they're going to have to handle customer site address management. The only thing that doesn't have to change is the easiest part of the system to get changed... the core routers and associated infrastructure.
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> the easiest part of the system to get changed... the core routers and associated infrastructure.
Is that really the easy bit to change? ISPs spend years trialling new hardware and software in their core. You go through numerous cheapo home routers over the lifetime of one of their chassis. You'll use whatever non-name box they send you, and you'll accept their regular OTA updates too, else you're on your own.
Yes. The router in your home would absolutely need to support IPv4x if you wanted to make use of the extended address space, just like how in the real world your home router needs to support NAT if you want to make use of shared IP.