Recent Impediments in Deploying IPv6

Internet Protocol version 6 is being adopted on slow pace and it is taking a long time. This paper intends to discuss the transition process between IPv4 and IPv6 and the major obstacles that prevent deploying IPv6 worldwide. It presents the IPv4 exhaustion reports results and where are the IPv4 address pool. Then it presents the methods that have been used to prolong the life expectancy of IPv4. After that it describes and discusses the mechanisms that have been used to deploy IPv6. Additionally, it describes the recently proposed mechanisms to overcome the problems encountered by the ISPs in migrating to IPv6. Furthermore, it shows the mechanisms that have been proposed to motivate the ISPs to start deploying IPv6 on their access networks. Finally, it presents a comparison between these mechanisms from the authors’ point of view.