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A comment on Tell HN: IPv6-only still pretty much unusable. Parent comment

Re:Tell HN: IPv6-only still pretty much unusable by andix on Wednesday December 07, 2022 @05:41PM (#33901410)
IPv4+ would be backwards compatible as long as the first 4 bytes are zero. So you could just replace the existing ipv4 stack.

Ipv6 is not backwards compatible at all.

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