IPv6 Network - Automatic Tunneling

The first automatic tunneling mechanism was simply called “automatic tunneling,” which is unfortunate because it is now one of many such mechanisms. “Automatic tunneling” is very similar to 6to4, except that it suffers from the limitation that a single IPv4 address maps to just a single IPv6 address. These IPv6 addresses are called “IPv4-compatible” and consist of 96 zero bits (the prefix ::/96) followed by the 32-bit IPv4 address. Although not formally deprecated by an IETF standards action, “automatic tunneling” should be considered obsolete. Figure 3-2 shows the IPv4-compatible address format used in “automatic tunneling.”

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