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Re:Ask HN: Would it be easier to make Ipv4 A.B.C.D.E vs. imp... by Someone on Tuesday September 11, 2018 @02:55AM (#17957669)
No. All the migration tools in the world aren’t worth anything in a world where zillions of devices assume IP addresses are 32-bit and don’t ship with source code and/or can’t be upgraded in the field (e.g. because there’s custom hardware implementing some of the protocol)

Also, if such a tool were possible, a tool 32to128 could be written, too.

Given that an incompatible update was necessary, there’s little difference in complexity between going for 40 bit addresses and going for 128 bit addresses.

Re:Ask HN: Would it be easier to make Ipv4 A.B.C.D.E vs. imp... by tinus_hn on Tuesday September 11, 2018 @07:22AM (#17958682)
IPv6 involves more than 128 bit addresses though. It would have been possible to create IPv4 but with longer addresses, even if that would have been a wasted opportunity for improvement and would have presented new scaling issues.