An IPv4 User Accessing an IPv6 Server
This section describes the application scenario where an IPv4 user accesses an IPv6 server.
As shown in Figure 1, in the later phase of the evolution from the IPv4 to IPv6, the server provider has to assign IPv6 addresses to new servers because of the lack of public IPv4 addresses. Many single-stack IPv4 users are still on the Internet. To reserve users, the server provider provides the NAT64 device to enable these users to access the server.
In this case, the IDC provider assigns only IPv6 addresses to the server. The access device does not need upgrade. The NAT64 device deployed at the IDC egress must support dual stack. The IPv6 access is implemented by the IPv6 router, while mutual access between IPv4 and IPv6 is implemented by the static NAT64 mapping technology.
