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If one were to redesign the network layer today, which architectural features and approaches would one keep, and which would be discarded? This talk will describe our group's attempt to answer that question. Goals for our architecture include autoconfiguration of all non-policy aspects (including addresses); inclusion of mechanisms that allow the policies of of all stakeholders to be expressed; and access to a larger range of route-selection strategies than is currently feasible.
(These are in addition to the "standard" goals of scalability, robustness, security, etc.) In a nutshell: packets are forwarded along layered, source-specified paths carried in packet headers, and policy is enforced via an in-band "motivation" mechanism. This talk will describe our design and point out some tenets of "conventional wisdom" that are challenged by both our design and our basic assumptions. (Joint work with Jim Griffioen and students Song Yuan and Onur Ascigil.)