[Dylan16807]

> Can you imagine how trivial it would have been if you could support both v4 and v6 by just supporting v6 and having 0::v4addr be literally equivalent to ipv4? It would be more difficult to not support v6.

And how are you supposed to get the packets back when the client has an address outside that range? You still need to add support everywhere, or have NAT gateways into the areas that lack support.

Automatic mapping of IPv4 addresses exists but it requires support infrastructure just as much as any other method of allowing access to IPv4 devices.