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The success of cellular communications networks shows the interest of users in mobility. These networks are evolving to provide not only the traditional voice service, but also data services. IP appears to be the base technology of future networks, to provide all kinds of services and through different access technologies, both fixed and mobile. Nevertheless, IP was not designed taking into account mobility of users and terminals, and in fact, IP does not support it, neither in IPv4 nor in IPv6. The IETF has defined some IP-layer protocols that enable terminal mobility in IPv4 and IPv6 networks.
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