Dual-stack is the way to go for a while, but eventually the depletion of IPv4 addresses will cause IPv6 only infrastructure and services to segment the Internet, those on IPv6 only and those IPv4 only. If the majority of the growth on the Internet will be IPv6, we'll be left with small and isolated IPv4 networks. It's time to look at those networks now and see what can be done today to ensure they are part of the IPv6 infrastructure. Certainly the commercial entities will not support expensive IPv4 support too long if there are only a few isolated IPv4 only subnets.
Dual stack is an interim solution to a real problem, dual-stack has a cost, it's expensive to operate and doubles the security exposure. Dual-stack is temporary.
The dates specified are suggestion only and need to be agreed on, they are to provoke a reaction, to think about the impacts of shutting down IPv4, to think of the global actions we need to take in order to have an IPv6 only Internet.
IPv4 is unsustainable on the global Internet. The increasing costs and declining performance of IPv4 based systems due to address overload are an unsustainable burden that is not only costly in terms of operational money, but also in placing artificial constraints on further development and by reducing the quality of the user experience.
IPv4 will die a natural death, but waiting for it to do so will take many more years than is currently desirable. Therefore, this I-D proposes to set a flag date to declare IPv4 no longer be supported as a globally routed protocol on the Internet. The authors recognize that pockets of IPv4 for various specialized applications will endure for years and possibly even decades to come. However, at the time of writing, IPv4 is the current “lingua franca” of the Internet. We propose to declare a date certain by which IPv6 will become the “lingua franca”.
Remove IPv4 from TLD Registries and Root zone : 2022/02/01 (6 years)
Remove IPv4 from IANA Registries: 2023/02/01 (7 years)
Remove IPv4 from AS Operator: 2024/04/04 (8 years)
IPv4 Historical Status: 2024/04/04
At least on Darwin, the highlights;
Brew install go
go get github.com/BurntSushi/toml/cmd/tomlv
go get github.com/miekg/mmark
mmark -xml2 -page Shutdown-IPv4.md > Shutdown-IPv4.xml
xml2rfc --text Shutdown-IPv4.xml
It seems to work :-)