November 8, 2007 4:00 AM PST

'Internet van' helped drive evolution of the Web

'Internet van' helped drive evolution of the Web
Related Stories

ICANN taps New Zealand lawyer to replace Cerf

November 5, 2007

The best of times in science and tech

April 3, 2006
Related Blogs

Google's Cerf: Deep space Web decades out

October 24, 2007
MOUNTAIN VIEW, Calif.--If not for this nondescript, gray van with the letters "SRI" painted on the side, you might not be reading this article right now.

Parked feet from the entrance of the Computer History Museum here in the heart of Silicon Valley, the vintage van is being feted at a celebration marking the very first true Internet connection.

The first Transmission Control Protocol (TCP)-based transmission between three separate networks--Arpanet, packet radio, and satellite--was made possible by the van, which was built by the research and development agency SRI International. It was driven for the first time on November 22, 1977. The same van was the key to the first packet radio network--that is, the first mobile digital radio network--a precursor to Wi-Fi and the other wireless networks of today.

The van "represents what a Land Rover does in Africa," said Vinton Cerf, who headed the project for the U.S. Department of Defense's Advanced Research Projects Agency. "It helped us explore terrain that didn't have any roads."

Click here to Play

Video: 'Internet van' turns 30's Kara Tsuboi introduces the engineers behind the nondescript truck played a role in the first wireless Net connection.

Filled to the brim with some of the most advanced technology of its day, the "Internet van," as it has since been nicknamed, would drive up and down Interstate 280 in the San Francisco Bay Area, broadcasting data at 100 to 400 kilobits per second. Data was sent from the van to various points around the world, including Los Angeles; Cambridge, Mass.; Sweden; and England--through telephone lines, and routed between satellites.

The data traveled a geographic distance of only 400 miles, from the van near San Francisco to the University of Southern California's Information Sciences Institute in Los Angeles. But to get there, that information traveled more than 100,000 miles through the three separate networks--up and down to several satellites and over phone lines to different nodes on the network.

At that time, Cerf, who among other things helped invent the architecture for the Internet as we know it today and the TCP/IP protocols, was in charge of technical oversight of the entire project to bring the three networks together. And there was no guarantee, of course, that the first transmission would succeed. "As an engineer, you're always surprised when a program you write actually works," he said. When the first bit of data was sent there and back without any problems, his reaction was a bit of shock. "I said, 'Holy cow! That actually worked!'"

What was revolutionary at the time was that this whole process took a half-second for the bit's round trip and that the network was reliable and didn't lose any information. By comparison, the Arpanet at that time could transmit information one way in 100 milliseconds.

Photos: Computer History Museum celebrates the 'Internet Van'

The head of the project for SRI, Donald Nielson, said it wasn't apparent in the late 1970s that riding around in the van was an event of any particular significance. Put in perspective of SRI's research over the past few decades, "this was not necessarily high on our list of accomplishments," said Nielson, now retired from SRI. Rather, it was "just another demonstration" of the technology they were working on, which they knew was important. E-mail had already been introduced in 1971, and by 1977, it was clear to all involved that the idea of digital networking would be a part of their future. "We knew that was going to change the world."

It wasn't until 1996, when an editor with the Institute of Electrical and Electronics Engineers called to ask about the first transmission on that November day in 1977, that Nielson realized that driving the beat-up van around the Bayshore Freeway was a seminal event in the advancement of the Internet.

The van has been almost completely refurbished, but still isn't drivable. It's been outfitted with much of the original technology, including two packet radios, each taking up a cubic foot of space and costing roughly $50,000 each. The radios in the van now are the only two still in existence, said Nielson. The vehicle sat virtually ignored for a decade or two.

With four flat tires, a disintegrated steering wheel, and much of the technology that once resided in it gutted, Nielson had it all put back together for a celebration of the 20th anniversary of the Internet. It was hauled from Moffett Field near Sunnyvale, Calif., the former site of the Computer History Museum, to a convention in San Jose, Calif. That others were interested in this tiny part of the Internet's history was surprising, Nielson said. "It was kind of a big carcass," he laughed.

Perhaps poetically, the van now sits exactly one mile from the sprawling campus of Google, arguably one of the most important technology companies today, and one that would be nonexistent if not for the work of Nielson, Cerf, and many, many others.

"A lot of people think the Internet just happened," said Cerf, who now works as the chief Internet evangelist for Google. "But it was a lot of hard work."

See more CNET content tagged:
SRI International, van, ARPAnet, broadcasting, Los Angeles


Join the conversation!
Add your comment
Get a custom license plate for it
Posted by (942 comments )
Reply Link Flag
i hope you're smarter than the other gw
<a class="jive-link-external" href="" target="_newWindow"></a>
Posted by krosavcheg (262 comments )
Link Flag
It needs to run on corn.
Posted by Phillep_H (497 comments )
Link Flag
Internet Van Importance
Great article, but you left out the part about where Al Gore helped
move the internet forward with his work.
Posted by cmg577rbg (1 comment )
Reply Link Flag
Not unless Al was driving the van...
I get the feeling that some readers want to jam EVERYTHING into a given article. For example, someone writes an article on making plastic containers, and then someone will come along and say the article lacks discussions about the environment. Keep any given article in-context and to the point.
Posted by groink_hi (380 comments )
Link Flag
Internet Van
Pity there is no pic of the van with this interesting article.
Posted by RobertGerrard (1 comment )
Reply Link Flag
Look to the right of the article....
Robert, no offense meant, and I do the same thing sometimes, but even though there were no photos in the article, the is a featured Photo Gallery of the day on the same page.

The pictures at <a class="jive-link-external" href="" target="_newWindow"></a> look great.
Posted by inetdog (40 comments )
Link Flag
Internet Van in CA changed the History of mankind
Really this is amazing to know how real revoltutions are made in the history of mankind simply innovative enggineering minds and brought in to real life the way of future commnunication between people around the world.
Really a Great Van "SRI" .........
And what is the expansion of SRI?
In sanskrit it means 2 things and One is "Beaury" and the other is "Wealth"
with love from,
Freelance Digital corres from South India.
Posted by kumaresh (2 comments )
Reply Link Flag

Join the conversation

Add your comment

The posting of advertisements, profanity, or personal attacks is prohibited. Click here to review our Terms of Use.

What's Hot



RSS Feeds

Add headlines from CNET News to your homepage or feedreader.