Comment on U.S. military strong-arming IT industry on IPv6parentComments−nitrogen15yThere is one problem. The IPv6-enabled equipment that provides Internet access to the IPv6 sender knows how to route an IPv4 address, but the IPv4 equipment at the recipient's ISP might not know how to route back to the IPv6 source.−tomjen315yThey would have to replace the equipment anyway−nitrogen15y...which kind of defeats the point of backward compatibility, doesn't it?
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There is one problem. The IPv6-enabled equipment that provides Internet access to the IPv6 sender knows how to route an IPv4 address, but the IPv4 equipment at the recipient's ISP might not know how to route back to the IPv6 source.
They would have to replace the equipment anyway
...which kind of defeats the point of backward compatibility, doesn't it?