As the era of the NSFnet Backbone Service came to a close in April 1995, the research community, and the U.S. public, lost the only set of publicly available statistics for a large national U.S. backbone. The transition to the commercial sector essentially eliminated the public availability of statistics and analyses that would allow scientific understanding of the Internet a macroscopic level.

In 2004 I compiled an (incomplete) list of what we generally can’t measure on the Internet, from a talk I gave on our NSF-funded project correlating heterogeneous measurement data to achieve system-level analysis of Internet traffic trends:

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i get this question a lot:

at the current churn rate/ratio, at what size does the
FIB need to be before it will not converge? (also sometimes pronounced ‘when will the current Internet routing architecture break?’)

a good question, has been asked many times, and afaik no one has provided any empirically grounded answer.

a few realities hinder our ability to answer this question.

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