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6.2. IPv4/IPv6 Address Translation Chart

6.2. IPv4/IPv6 Address Translation Chart​

This chart offers an explanation about address translation architecture using a combination of stateful translation at the PLAT and stateless translation at the CLAT. The client on this chart is delegated an IPv6 prefix from a prefix delegation mechanism such as DHCPv6 Prefix Delegation (DHCPv6-PD) [RFC3633]; therefore, it has a dedicated IPv6 prefix for translation.

                                       Destination IPv4 address
                                      +----------------------------+
                                      | Global IPv4 address        |
                                      | assigned to IPv4 server    |
                           +--------+ +----------------------------+
                           |  IPv4  |  Source IPv4 address
                           | server | +----------------------------+
                           +--------+ | Global IPv4 address        |
                               ^      | assigned to IPv4 PLAT pool |
                               |      +----------------------------+
                           +--------+
                           |  PLAT  | Stateful XLATE(IPv4:IPv6=1:n)
                           +--------+
                               ^
                               |
                          (IPv6 cloud)
     Destination IPv6 address
    +--------------------------------------------------------------+
    | IPv4-embedded IPv6 address                                   |
    | defined in Section 2.2 of RFC 6052                           |
    +--------------------------------------------------------------+
     Source IPv6 address
    +--------------------------------------------------------------+
    | IPv4-embedded IPv6 address                                   |
    | defined in Section 2.2 of RFC 6052                           |
    +--------------------------------------------------------------+
                          (IPv6 cloud)
                               ^
                               |
                           +--------+
                           |  CLAT  | Stateless XLATE(IPv4:IPv6=1:1)
                           +--------+
                               ^       Destination IPv4 address
                               |      +----------------------------+
                           +--------+ | Global IPv4 address        |
                           |  IPv4  | | assigned to IPv4 server    |
                           | client | +----------------------------+
                           +--------+  Source IPv4 address
                                      +----------------------------+
                                      | Private IPv4 address       |
                                      | assigned to IPv4 client    |
                                      +----------------------------+

Figure 3: Case of Enabling Only Stateless XLATE on CLAT

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