Despite what one might read in certain techno-marketing publications, IPv4 is very much alive; it has not by any stretch yet been replaced by IPv6.
So it remains important that vendors of networking products do IPv4 and do it correctly.
But some vendors appear to be getting lazy.
In particular one of the largest vendors seems to be taking a shortcut that could leave users unable to communicate even though those users have otherwise perfectly usable packet service from their network providers.
A subset of the Maxwell Pro TCP/IP tests were run against the most widely installed desktop Operating System with all known operating system updates applied as of October 1, 2013. The Major Operating System is listed in the Phase 2 Core Protocols IPv6...