Eh, I personally think the response in the foremost link is disingenuous. It says v4 can’t talk to v4+ (AutoIPv6 address). This would be true for non dual stack

Eh, I personally think the response in the foremost link is disingenuous. It says v4 can’t talk to v4+ (AutoIPv6 address). This would be true for non dual stacked systems; in whatever world you come up with. Obviously you need at least one host to be dual stack for interoperability.