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INL: IP Networking Lab: "The Internet architecture was designed in the 1970s as a small internetwork to serve the needs of researchers. For the last 30 years, the Internet continued to grow and we are now getting close to hitting the limits of the 32 bits IPv4 addressing space. During the last decade, the Internet Engineering Task Force has been designing IPv6 as a replacement for IPv4. Most of the initial benefits of IPv6 (security, QoS, autoconfiguration, ...) have been ported to IPv4 and IPv6 deployment has been limited."