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@lanodan @dalias there's no realistic network that is "IPv4-less" — at least not in terms of egress.

They may be NAT64 or have a proxy (if it's a backend network with limited egress), but if you don't have v4 egress of some kind you have an unusable network (https://flameeyes.blog/2023/04/30/ipv6-in-real-life/).

Otherwise — yeah it's silly that they put these warnings for Docker in 2023 (given that, btw, getting this to work "right" even without ip6tables is relatively straightforward¹), but it's important still a thing.