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A comment on AWS to Begin Charging for Public IPv4 Addresses. Parent comment
That's the problem. If the OS starts using IPv6 preferentially but the software on top can't handle it, then you get a crash.
E.g.: if you turn on IPv6 for DNS and it starts returning AAAA records instead of A records, then a lot of applications fall flat on their face.
Usually the type written in C and insisting on maintaining compatibility with whatever Berkley did in the 1970s.
That's the problem. If the OS starts using IPv6 preferentially but the software on top can't handle it, then you get a crash.
E.g.: if you turn on IPv6 for DNS and it starts returning AAAA records instead of A records, then a lot of applications fall flat on their face.
Usually the type written in C and insisting on maintaining compatibility with whatever Berkley did in the 1970s.