IPv6 Addressing of IPv4/IPv6 Translators

DHCPv6 Option for IPv4-Embedded Multicast and Unicast IPv6 Prefixes

“…IPv4-embedded IPv6 address: an IPv6 address that embeds a 32-bitencoded IPv4 address [RFC6052]. An IPv4-embedded IPv6 address can be a unicast or a multicast address.…”

“…In this case, any additional padding bits must be zeroed. The address mapping MUST follow the guidelines documented in [RFC6052].…”

“…If the unicast-length field is non-null, the IPv6 prefix identified by uPrefix64 is used to synthesize IPv4-embedded IPv6 unicast addresses as specified in [RFC6052].…”

Explicit Address Mappings for Stateless IP/ICMP Translation

“…The Stateless IP/ICMP Translation Algorithm (SIIT) [RFC6145] specifies that when translating IPv4 addresses to IPv6 and vice versa, all addresses must be translated using the algorithm specified in [RFC6052]. This document specifies an alternative to the algorithm specified in [RFC6052], where IP addresses are translated according to a table of Explicit Address Mappings configured on the stateless translator.…”

“…This document specifies an alternative to the algorithm specified in [RFC6052], where IP addresses are translated according to a table of Explicit Address Mappings configured on the stateless translator. This removes the previous constraint that IPv6 nodes that communicate with IPv4 nodes through SIIT must be configured with IPv4-translatable IPv6 addresses.…”