4 ms·
> In my opinion, the most significant mistake of IPv6 has been that the IPv4 address space has not been considered a subset of the IPv6 address space. This sug
by colanderman 2y ago
> In my opinion, the most significant mistake of IPv6 has been that the IPv4 address space has not been considered a subset of the IPv6 address space.
This suggestion has gotten brought up often over the past few decades.
Remember that every IP packet has a destination and source address. There is no physical way for a v4-only host to directly communicate with another host which has an address from a larger address space. Doing so requires NAT. Which can be and is used today for v4-v6 connectivity.