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what one might read in certain techno-marketing publications, IPv4 is very much alive; it has not by any stretch yet been replaced by IPv6.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 …

The IPv6 Ready certification program addresses RFC Conformance and Interoperability. "RFC Conformance" mean the tests verify that the DUT (device under test) does what it is supposed to do based on the RFC specifications. "Interoperability" means the tests verify that the DUT can send and receive IPv6 datagrams to and from other devices …