> They aren’t compatible. There is a device in the middle doing a translation for you.
Which was true of all the IPng candidates, and not just the one that ended up being chosen for "IPv6".
There is no way to expand the addresses space (as found in IPv4) to something greater that 32-bits in a compatible: new API calls, data structures, DNS records, etc, were always going to be needed.
To list "not compatible" as a con of IPng/IPv4 is non-sensical.
Which was true of all the IPng candidates, and not just the one that ended up being chosen for "IPv6".
There is no way to expand the addresses space (as found in IPv4) to something greater that 32-bits in a compatible: new API calls, data structures, DNS records, etc, were always going to be needed.
To list "not compatible" as a con of IPng/IPv4 is non-sensical.