Mobile IPv4 and Mobile IPv6

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1. INTRODUCTION As users demand more and more extensive computing wireless networks are becoming more abundant. With the success of the internet it is not far from IP becoming the foundation of next generation wireless networks. These networks are providing the mobile users access to the Internet anytime and anywhere. The essential element that allows this connection is the IP address. Unfortunately internet protocols were designed before mobility was an issue. Under standard IP, if a mobile node moves from one subnet to another it needs to be assigned a new IP address in order to maintain its connectivity. Since the majority of the traffic on the Internet uses TCP connection it means that the port numbers for the source and destination need to be maintained. Having in mind that when a new IP address is issued the pervious TCP connection needs to be taken down, it is obvious that the standard IP cannot really withstand a frequent movement of the nodes. This process is called handoff and it should be very fast and transparent for the users thus providing them acceptable quality of service. Several solutions have been designed solving these issues some of them very similar using a common architecture just improving some parts, others very different proposing entirely different approaches. The most widely used mechanism for solving the issue of mobility is Mobile IP. The International Engineering Task Force issued a Mobility Support Solution under RFC2002 in 1996. The Mobile IP has been implemented under both IPv4 and IPv6 differing in their technical details. In order to achieve better handoff times later on the mobility was divided into macro and micro mobility. Mobile IP kept its duty to handle mobility but now the responsibility of the mobility inside the network has been assigned to Cellular IP. Cellular IP works closely with Mobile IP when it comes to

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