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The Internet was designed for academic use more than 40 years ago. After having been used commercially, many unpredictable requirements have emerged, including mobility, security and content distribution. In addition, the Internet has become so ossified that fulfilling new requirements is difficult. Instead of developing ad-hoc solutions, re-designing clean-slate Internet architectures has become a key research challenge in networking communities. This survey paper addresses key research issuesdoi:10.1587/transcom.e96.b.1385 fatcat:554cvm4bonb6ta4is4lzqfjloy