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IVI Translation - Wikipedia

From Wikipedia, the free encyclopedia

IPv6 transition mechanisms
Standards Track
4in6 Lightweight 4over6 6in4 6over4 DS-Lite 6rd 6to4 NAT64 / DNS64 Teredo SIIT MAP
Experimental
TSP 4rd
Informational
Tunnel broker IVI TRT 464XLAT Public 4over6 ISATAP
Drafts
AYIYA dIVI
Deprecated
NAT-PT NAPT-PT
v t e

IVI Translation refers to a stateless IPv4/IPv6 translation technique.^[1] It allows hosts in different address families (IPv4 and IPv6) communicate with each other and keeps the end-to-end address transparency.^[2]

Stateless NAT64 can be used in 4 different scenarios:^[3]

An IPv6 network to the IPv4 Internet
The IPv4 Internet to an IPv6 network
An IPv6 network to an IPv4 network
An IPv4 network to an IPv6 network

Stateless NAT64 is a replacement of SIIT (RFC 6145).

Naming

The name "IVI" represents the number 4 (IV) and 6 (VI) in roman numerals merged to represent the IPv4/IPv6 translation.^[2]

How it works

Stateless NAT64 building blocks

Address translation defined in RFC 6052 ^[4] is a stateless mapping scheme, which embeds IPv4 address in network specific IPv6 prefix and forms IPv4-converted and IPv4-translatable addresses. The IPv4-converted IPv6 addresses are the IPv6 addresses used to represent IPv4 nodes in an IPv6 network. The IPv4-translatable IPv6 addresses are the IPv6 addresses assigned to IPv6 nodes for use with stateless translation.
Header translation and ICMP translation defined in RFC 6145 ^[5] are algorithms to perform header translation between IPv4 and IPv6, as well as between ICMP and ICMPv6.
DNS record translation (DNS64) defined in RFC 6147 ^[6] describes mapping from A record to AAAA record defined in RFC 6052.^[4]

Stateless NAT64 extensions

Address sharing stateless NAT64 enables multiple IPv6 nodes sharing a single public IPv4 address, with each node managing a different range of ports. This can be achieved by defining suffix of the address format RFC 6052.^[4]^[7]
Dual stateless translation is also called dIVI Translation. Due to the stateless nature, after the second translation, the original IPv4 address can be restored. The advantage of stateless NAT464 is that the DNS64 and application-level gateway (ALG) are not needed.

Case study

RFC 6219: China Education and Research Network (CERNET)'s IVI translation design and deployment for the IPv4/IPv6 coexistence and transition.^[2]
RFC 7599: MAP-T is being used on the IPv6-only "CERNET2", expanding on the work done with CERNET.^[8]

Relation to Stateful NAT64

The stateless NAT64 also forms the basic building blocks for stateful NAT64. Additional building block is the maintaining of the translation states defined in RFC 6146.^[9]

Relation to Stateless NAT464 (dIVI, dIVI-PD)

Due to stateless nature, the second stateless translator can be introduced to translate the IPv4-translatable IPv6 address back to IPv4. In this case, the DNS64 and ALG are not required. See dIVI Translation

References

^ "Home". ivi2.org. Archived from the original on 2011-11-02. Retrieved 2011-08-12.
^ ^a ^b ^c RFC 6219 China Education and Research Network (CERNET)'s IVI translation design and deployment for the IPv4/IPv6 coexistence and transition
^ RFC 6144 Framework for IPv4/IPv6 Translation
^ ^a ^b ^c RFC 6052 IPv6 Addressing of IPv4/IPv6 Translators
^ RFC 6145 IP/ICMP Translation Algorithm
^ RFC 6147 DNS64: DNS extensions for Network Address Translation from IPv6 Clients to IPv4 Servers
^ draft-bcx-address-fmt-extension Extended IPv6 Addressing for Encoding Port Range (https://datatracker.ietf.org/doc/draft-bcx-address-fmt-extension/)
^ "China's first IPv6-only backbone network to connect a further 1,200 campuses". 31 January 2017.
^ RFC 6146 Stateful NAT64: Network Address and Protocol Translation from IPv6 Clients to IPv4 Servers

v t e Internet Protocol version 6
General	IPv6 IPv6 address IPv6 packet Mobile IPv6
Deployment	IPv6 deployment 6rd World IPv6 Day and World IPv6 Launch Day Comparison of IPv6 support in operating systems Comparison of IPv6 support in common applications
IPv4 to IPv6 topics	IPv4 address exhaustion IPv6 transition mechanism
Related protocols	DHCPv6 ICMPv6 Neighbor Discovery Protocol Multicast Listener Discovery Secure Neighbor Discovery Multicast router discovery Site Multihoming by IPv6 Intermediation

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