Researchers explore scrapping Internet

These clean-slate efforts are still in their early stages, though, and aren't expected to bear fruit for another 10 or 15 years — assuming Congress comes through with funding.

Guru Parulkar, who will become executive director of Stanford's initiative after heading NSF's clean-slate programs, estimated that GENI alone could cost $350 million, while government, university and industry spending on the individual projects could collectively reach $300 million. Spending so far has been in the tens of millions of dollars.

And it could take billions of dollars to replace all the software and hardware deep in the legacy systems.

Clean-slate advocates say the cozy world of researchers in the 1970s and 1980s doesn't necessarily mesh with the realities and needs of the commercial Internet.

"The network is now mission critical for too many people, when in the (early days) it was just experimental," Zittrain said.

The Internet's early architects built the system on the principle of trust. Researchers largely knew one another, so they kept the shared network open and flexible — qualities that proved key to its rapid growth.

But spammers and hackers arrived as the network expanded and could roam freely because the Internet doesn't have built-in mechanisms for knowing with certainty who sent what.

The network's designers also assumed that computers are in fixed locations and always connected. That's no longer the case with the proliferation of laptops, personal digital assistants and other mobile devices, all hopping from one wireless access point to another, losing their signals here and there.

Engineers tacked on improvements to support mobility and improved security, but researchers say all that adds complexity, reduces performance and, in the case of security, amounts at most to bandages in a high-stakes game of cat and mouse.

Workarounds for mobile devices "can work quite well if a small fraction of the traffic is of that type," but could overwhelm computer processors and create security holes when 90 percent or more of the traffic is mobile, said Nick McKeown, co-director of Stanford's clean-slate program.

The Internet will continue to face new challenges as applications require guaranteed transmissions — not the "best effort" approach that works better for e-mail and other tasks with less time sensitivity.

Think of a doctor using teleconferencing to perform a surgery remotely, or a customer of an Internet-based phone service needing to make an emergency call. In such cases, even small delays in relaying data can be deadly.

And one day, sensors of all sorts will likely be Internet capable.

Rather than create workarounds each time, clean-slate researchers want to redesign the system to easily accommodate any future technologies, said Larry Peterson, chairman of computer science at Princeton and head of the planning group for the NSF's GENI.

Even if the original designers had the benefit of hindsight, they might not have been able to incorporate these features from the get-go. Computers, for instance, were much slower then, possibly too weak for the computations needed for robust authentication.

"We made decisions based on a very different technical landscape," said Bruce Davie, a fellow with network-equipment maker Cisco Systems Inc., which stands to gain from selling new products and incorporating research findings into its existing line.

"Now, we have the ability to do all sorts of things at very high speeds," he said. "Why don't we start thinking about how we take advantage of those things and not be constrained by the current legacy we have?"

Of course, a key question is how to make any transition — and researchers are largely punting for now.

"Let's try to define where we think we should end up, what we think the Internet should look like in 15 years' time, and only then would we decide the path," McKeown said. "We acknowledge it's going to be really hard but I think it will be a mistake to be deterred by that."

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