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The TCPIP protocols the basis for todays Internet lack even the most basic mechanisms for security such as authentication or encryption As usage of the Internet and TCPIP protocols increases their lack of built-in security has become more and more problematic This paper describes a variety of basic flaws in TCPIP protocols and their implementations and discusses solutions and work-arounds to these problems Also covered is the new IPv6 the next-generation Internet protocol that among other goals seeks to fix many of the current flaws in the current Internet IPv4 protocol Security in protocols and applications not essential to TCPIP such as HTTP FTP and SMTP are not discussed in this paperIn the early 1980s specifications were finished for the TCP and IP protocols These two protocols could be considered the most important in the world today - they are the basis of the Internet Over the past decade the Internet has grown from a small network connecting a small community of researchers to its present state - a gigantic global network connecting people of all types The huge success of the Internet has for the most part been quite beneficial The Internet has evolved from a specialized project to a general-purpose tool However the growth of the Internet has created problems with security The TCP and IP protocols were designed when the Internet was small and users generally trusted each other The protocols lack many features that are desirable or needed on an insecure network In this paper we present a number of problems that arise with using TCPIP on todays network solutions or work-arounds for these problems and how the protocols for tomorrows Internet such as IPv6 will help eliminate these problems TCPIP is the backbone of the internet today Comprised of two protocols TCP and IP the TCPIP protocol suite is one of the most widely used We present a brief introduction to the two protocols For a detailed discussion of the
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