An IPv6 User Accessing an IPv4 Server
This section describes the application scenario where an IPv6 user accesses an IPv4 server.
As shown in Figure 1, in the later phase of the evolution from the IPv4 to IPv6, the carrier provides users with single-stack IPv6 access. However, lots of Internet servers still use IPv4 and do not support dual stack. In this case, the carrier provides single-stack IPv6 users with the NAT64 for access to IPv4 servers.
The carrier assigns only IPv6 addresses to users. The NAT64 device supports dual stack. The IPv6 access is implemented by the IPv6 router, while mutual access between IPv4 and IPv6 is implemented by the dynamic NAT64 mapping technology.
