Tuesday, 13 September 2011

Ipv6 Tunneling Over Ipv4 Infrastructure

Although the Internet Protocol IPv4 was giving efficient service over than 20 years ,
but the new Internet Protocol IPv6 provides higher efficiency like having enough
level of IPs, stronger security and mobility. In fact it is good to evaluate the performance benefits that we can get from IPv6 protocol in compare to the IPv4 protocol. We can upgrade the existing IPv4 infrastructure to the next generation Internet Protocol(IPv6) and get its advantages using the transition mechanisms.
When IPv4 was designed most of networks had just few nodes, low bandwidth, high latency, and high error rates. Most common applications at that time were FTP,e-mail, and so on.In the early 1990’s, the computer industry expanded with coming the personal computers (PCs) to the market. The internet also developed and electronic businesses or e-commerce started. The market demand was the biggest factor in the Internet’s revolution. As the fast grow of the Internet was detected in the early 1990’s, it was
showing that the IPv4 address space would be finish by the end of the century. In this
regard, some mechanisms such as Network Address Translator (NAT) have extended the life of IPv4, but it was not a logical solution.Today, the market looks completely different than it was in the 1980’s. Although FTP, and e- mail are still very popular today but new applications such as video conferencing, Voice-over-IP, E-Commerce, Mobiles, and etc , have led the Internet
Engineering Task Force (IETF) to seek a new Internet Protocol, that we call it IPv6.
IPv4 and IPv6 are incompatible protocols. For this reason, transition to the new protocol cannot be expected to be painless, and will involve significant costs for service providers and customers alike. If we compare the costs of transition with the non-transition mode or using IPv4 with supporting new services, then it can help us identify the best time to start the transition process .Whenever transition begins there will be no single "flag day" on which the all-IPv4 network turns into an IPv6 network. At the Internet level, transition will be a lengthy
process, with the two protocols existing side by side for many years to come. To facilitate transition, the IETF (Internet Engineering Task Force) has set up a work group called ngtrans (Next Generation TRANSition) which specifies mechanisms for supporting interoperability between IPv4 and IPv6. In particular, the group has focused on two major problems:
•How to make IPv6 terminals communicate with IPv4 terminals.
•How to transport IPv6 over an IPv4 network so that IPv6 "islands" interconnected via the IPv4-based Internet can communicate.
This second problem, which is extremely important in the initial stage of IPv6
deployment, will be joined in the future by the reciprocal problem: how to transport
IPv4 over IPv6. However; discussion of this issue have been postponed until the presence of IPv6 reaches to a significant point on the Internet.
Work on these problems has led to the development of a set of transition mechanisms, each targeted to a particular range of uses and applications.
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