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@lanodan @dalias (français n'est pas un probleme — though I'm very rusty in writing it)

That sounds about right, though? You can have _some_ problems not having v6, but you don't have access to the Internet without v4.

Dual-stack is the minimum bar to be a modern service (glaring at GitHub as always) but it's way too early to disable v4. (Nit: if you're developing software/firmware/products that are supposed to last more than a year you should test them on v6-only networks!)