> Everyone still needs an IPv4 to the outside world for compatibility... Is this really true/correct? Assuming that an ISP would implement a pure IPv6-network

> Everyone still needs an IPv4 to the outside world for compatibility... Is this really true/correct? Assuming that an ISP would implement a pure IPv6-network for its customers, wouldn't their customers by typing on their PCs e.g. "ping 1.2.3.4" in their terminals be routed automatically through "[internal IPv4 network between customer and ISP] => [ISP's public IPv6 address in Internet being translated to their SINGLE allocated IPv4-address] => [target's IPv4 address]", and then back (to get the ping-reply)? So, some kind of "magic" IPv4[internal customer]=>IPv4[internal ISP] => IPv6[external ISP]=>IPv4[external ISP] => IPv4[target], using NAT or however it's called? I'm absolutely not good in relation with networking, especially not IPv6 (in theory simple, that was at least the tone of the articles that I read a few years ago, but at that time it has been quite difficult for me to set it up on my root servers), so what I just wrote might be plain wrong :P