Fred Baker wrote:
I'm familiar with the paper "End to end arguments in system design" as well. I'm also familiar with John Day, although I suspect I have learned more from him than he has learned from me.
As for RINA by John Day, following description in wikipedia (if any of you have better reference, hopefully open access one, let me know) disturbed me: https://en.wikipedia.org/wiki/Recursive_Internetwork_Architecture CLNP was an OSI-based protocol that addressed nodes instead of interfaces, solving the old multi-homing problem introduced by the ARPANET, and allowing for better routing information aggregation. As CLNP addresses basically are telephone numbers, they are aggregated by country code, which requires reliable telephone exchangers exist connecting all the international and intra-national long distance carriers in each country. Similarly, aggregation by area code needs similar telephone exchangers in each area. That is, John, seemingly, think geography based addressing is good, which is against our understanding that requiring IXes in all the geographic regions is not practical. Or, according to the E2E argument: The function in question can completely and correctly be implemented only with the knowledge and help of the application standing at the end points of the communication system. Therefore, providing that questioned function as a feature of the communication system itself is not possible. providing multihoming function by telephone exchangers or IXes, that is, "as a feature of the communication system itself", completely and correctly is not possible. Thus, if telephone exchangers or IXes fail and intra-national network is partitioned, the result will be disastrous. Masataka Ohta PS Distribution of this mail is unlimited.
