It is probably a good an example of the "second system effect" [1] where developers were given an opportunity to go back and fix the problems they saw in IPv4.

It is probably a good an example of the "second system effect" [1] where developers were given an opportunity to go back and fix the problems they saw in IPv4. Some obvious examples: - IPv4 options are too inflexible, lets provide IPv6 with extension headers instead. - IPv4 ARP broadcasts are inefficient, lets use multicasts for IPv6 neighbor discovery instead. 1: https://en.wikipedia.org/wiki/Second-system_effect https://en.wikipedia.org/wiki/Second-system_effect