This is an interesting question. When a dual-stack host with both native IPv6 and IPv4 connectivity access a website http://www.abc.com/ which has an IPv4 address and a 6to4 address, should the client host use IPv4 or IPv6 paths. Since the IPv6 address of the server is not an native one and is less reliable, the client host shall abandon IPv6 and use IPv4 connection only.
I have tested and the scenario is verified correct.
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