Layers and abstractions

Posted Mar 23, 2019 6:53 UTC (Sat) by Cyberax (✭ supporter ✭, #52523)
In reply to: Layers and abstractions by perennialmind
Parent article: Layers and abstractions

> NAT is bound to be the fallback in any scheme.
Whatever system you end up will not be functionally different from dual stack IPv6 + IPv4 NAT.

This is what is happening right now - you still have legacy IPv4 infrastructure with NAT-ed clients and newer IPv6 infrastructure without NATs. They both live together side-by-side seamlessly, thanks to Happy Eyeballs RFC.

> But even if you drop the stateful NAT option, under this scheme, or a 6to4-only-IPv6 phase, clients with mere IPv4 access can talk to the full IPng internet. For servers, there's no good reason not to opt-in to IPng.
No they can not. IPv4 clients can only connect to IPv4 addresses, so the server will have to use IPv4. Peer-to-peer with IPng is still impossible.