Vint Cerf and Bob Kahn are this year s recipients of the ACM Turing Award (the highest award in Computer Science) for their pioneering work in internetworking. To commemorate their award, and with the gracious consent of IEEE (which originally published the paper) and the authors, SIGCOMM is reprinting their famous early paper on internetworking, A Protocol for Packet Network Interconnection, from IEEE Transactions on Communications of May 1974. When the paper was written, Bob was early in his thirteen year-career at the US Defense Advanced Research Projects agency and Vint was a junior professor at Stanford. Bob eventually left DARPA and has continued in a distinguished career of nurturing research through the not-for-profit Corporation for National Research Initiatives (CNRI), which he founded in 1986 and has led ever since. Vint soon left Stanford to spend several years at DARPA. After DARPA, Vint worked at MCI, leading the development of MCI Mail, then worked with Bob at CNRI, then rejoined MCI in 1994, where he is senior vice president for technology strategy. Throughout this time, both Vint and Bob have been actively involved in Internet activities. For many years, Vint served on (and for some years, chaired) the Internet Activities Board. Vint is currently chairman of the board of the Internet Corporation for Assigned Names and Numbers (ICANN). Bob, Vint and CNRI have provided essential support services for the Internet Engineering Task Force (IETF) for many years. Closer to home, both Bob and Vint have served as chairs of SIGCOMM. And both have received the ACM SIGCOMM Award: Bob in 1993 and Vint in 1996. I continue to find reading this paper intellectually rewarding, both for what it contains and what it does not. What it contains, of course, is a lot of the ideas that eventually became TCP and IP. It is somewhat astonishing to see how much was known in 1974, only 5 years after ARPANET was turned on. Equally interesting are things that were missing, such as congestion coordination with routers (e.g. the TCP congestion window). And there are also a few (not many) ideas that turned out to be bad (such as shrinking the receiver window from the right). All in all a rewarding read and I hope you ll agree, worth reprinting 31 years later! Craig Partridge Chief Scientist, BBN Technologies past-chair, ACM SIGCOMM acm sigcomm ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ¢ ACM SIGCOMM Computer Communications Review Volume 35, Number 2, April 2005
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