tailieunhanh - Internetworking with TCP/IP- P65

Internetworking with TCP/IP- P65: TCP/IP has accommodated change well. The basic technology has survived nearly two decades of exponential growth and the associated increases in traffic. The protocols have worked over new high-speed network technologies, and the design has handled applications that could not be imagined in the original design. Of course, the entire protocol suite has not remained static. New protocols have been deployed, and new techniques have been developed to adapt existing protocols to new network technologies | 33 The Future Of TCP IP IPv6 Introduction Evolution of TCP IP technology is intertwined with evolution of the global Internet for several reasons. First the Internet is the largest installed TCP IP internet so many problems related to scale arise in the Internet before they surface in other TCP IP internets. Second funding for TCP IP research and engineering comes from companies and government agencies that use the operational Internet so they tend to fund projects that impact the Internet. Third because most researchers use the global Internet daily they have immediate motivation to solve problems that will improve service and extend functionality. With millions of users at tens of thousands of sites around the world depending on the global Internet as part of their daily work environment it might appear that the Internet is a completely stable production facility. We have passed the early stage of development in which every user was also an expert and entered a stage in which few users understand the technology. Despite appearances however neither the Internet nor the TCP IP protocol suite is static. Groups discover new ways to use the technology. Researchers solve new networking problems and engineers improve the underlying mechanisms. In short the technology continues to evolve. The purpose of this chapter is to consider the ongoing evolutionary process and examine one of the most significant engineering efforts a proposed revision of IP. When the proposal is adopted by vendors it will have a major impact on TCP IP and the global Internet. 599 600 The Future Of TCP IP IPv6 Chap. 33 Why Change The basic TCP IP technology has worked well for over two decades. Why should it change In a broad sense the motivation revising the protocols arises from changes in underlying technologies and uses. New Computer And Communication Technologies. Computer and network hardware continues to evolve. As new technologies emerge they are incorporated into the Internet. .