There are limitations caused by the software configuration of most AS's. Significant work is being done on novel approaches to IP routing with better security,

There are limitations caused by the software configuration of most AS's. Significant work is being done on novel approaches to IP routing with better security, scalability and control guarantees by ETH Zurich, as part of the SCION project. It's sponsored by the EU, Google, Swisscom, the NSF and a few other entities. Link: http://www.scion-architecture.net/ http://www.scion-architecture.net/ This is already "live" in the sense that it is implemented and there are 14 router nodes active, and it is meant to be incrementally deployed. I haven't gotten around to hooking up a client myself, that will be an interesting weekend project someday. Any interested ISP can set up their own node and join this project. Some cool things about SCION and its extensions: * Isolation domains: can be used to enforce traffic to never leave a given routing sub-plane, for instance a country or a state * SIBRA: volumetric DDoS mitigation and enablement of the creation of "dynamic interdomain leased lines" * HORNET: high-speed onion routing