IVI-IPv4/IPv6Coexistence And Transition Mechanism

IANA’s IPv4address pool has dried up. IPv4addresses resource held inRIR will soon be depleted because more customers are coming to Internet.IPv6is considered as next-generation Internet Protocol which could solve theaddress deficiency problem, but it is not commercially successful, because ofa lack of transition scheme to solve IPv4/IPv6resource migration. Translationsolution could be used to help IPv4and IPv6networks to communicate witheach other. In this article, we propose IVI, an IPv4/IPv6translation schemeused in IPv4/IPv6coexistence and transition.The address translation of IVI is based on the definition of RFC6052andother previous work. It breaks the length limit of NSP imposed by RFC6052.The establishment of Ping Beacon facilitates network management duringIPv4/IPv6transition. With the IVI DNS-ALG, IPv4and IPv6network couldcommunicate with each other using domain names.As for different scenarios of IVI, besides previous work about stateless1:1IVI and stateless1:N IVI, we design and analyze the stateful IVI andDual-IVI. Port mapping is incorporated in stateless1:N IVI-box. With allthese efforts, IVI support a wide range of transition scenarios and could beused in different phases during IPv4/IPv6transition.We explain how it translates packets between IPv4andIPv6, and howdifferent variations of IVI works in different scenarios in each phase oftransition period. Scalability and robustness of IVI is also evaluated in thisarticle.