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By the summer of 1973, Kahn and Cerf had worked out a fundamental reformulation, in which the differences between local network protocols were hidden by using a common [[internetwork protocol]], and, instead of the network being responsible for reliability, as in the existing ARPANET protocols, this function was delegated to the hosts. Cerf credits [[Louis Pouzin]] and [[Hubert Zimmermann]], designers of the [[CYCLADES]] network, with important influences on this design.<ref name="YSZAX">{{Cite journal|last1=Cerf|first1=V.|last2=Kahn|first2=R.|date=1974|title=A Protocol for Packet Network Intercommunication|url=https://www.cs.princeton.edu/courses/archive/fall06/cos561/papers/cerf74.pdf|journal=IEEE Transactions on Communications|volume=22|issue=5|pages=637–648|doi=10.1109/TCOM.1974.1092259|issn=1558-0857|quote=The authors wish to thank a number of colleagues for helpful comments during early discussions of international network protocols, especially R. Metcalfe, R. Scantlebury, D. Walden, and H. Zimmerman; D. Davies and L. Pouzin who constructively commented on the fragmentation and accounting issues; and S. Crocker who commented on the creation and destruction of associations.|access-date=October 18, 2015|archive-date=October 10, 2022|archive-url=https://ghostarchive.org/archive/20221010/https://www.cs.princeton.edu/courses/archive/fall06/cos561/papers/cerf74.pdf|url-status=live}}</ref><ref name="MevuR">{{cite news|date=13 December 2013|title=The internet's fifth man|work=Economist|url=https://www.economist.com/news/technology-quarterly/21590765-louis-pouzin-helped-create-internet-now-he-campaigning-ensure-its|access-date=11 September 2017|quote=In the early 1970s Mr Pouzin created an innovative data network that linked locations in France, Italy and Britain. Its simplicity and efficiency pointed the way to a network that could connect not just dozens of machines, but millions of them. It captured the imagination of Dr Cerf and Dr Kahn, who included aspects of its design in the protocols that now power the internet.|archive-date=April 19, 2020|archive-url=https://web.archive.org/web/20200419230318/https://www.economist.com/news/technology-quarterly/21590765-louis-pouzin-helped-create-internet-now-he-campaigning-ensure-its|url-status=live}}</ref> The new protocol was implemented as the [[Transmission Control Program]] in 1974 by Cerf, [[Yogen Dalal]] and Carl Sunshine.{{Ref RFC|675}}
Initially, the Transmission Control Program,
The design of the network included the recognition that it should provide only the functions of efficiently transmitting and routing traffic between end nodes and that all other intelligence should be located at the edge of the network, in the end nodes. This [[end-to-end principle]] was pioneered by Louis Pouzin in the CYCLADES network,<ref name="Bennett2009">{{cite web |last1=Bennett |first1=Richard |date=September 2009 |title=Designed for Change: End-to-End Arguments, Internet Innovation, and the Net Neutrality Debate |url=https://www.itif.org/files/2009-designed-for-change.pdf |access-date=11 September 2017 |publisher=Information Technology and Innovation Foundation |pages=7, 11}}</ref> based on the ideas of [[Donald Davies]].<ref name="Pelkey2">{{cite book |last=Pelkey |first=James |url=https://www.historyofcomputercommunications.info/section/8.3/cyclades-network-and-louis-pouzin-1971-1972/ |title=Entrepreneurial Capitalism and Innovation: A History of Computer Communications 1968-1988 |chapter=8.3 CYCLADES Network and Louis Pouzin 1971-1972 |quote=The inspiration for datagrams had two sources. One was Donald Davies’ studies. He had done some simulation of datagram networks, although he had not built any, and it looked technically viable. The second inspiration was I like things simple. I didn’t see any real technical motivation to overlay two levels of end-to-end protocols. I thought one was enough. |access-date=2021-11-21 |archive-url=https://web.archive.org/web/20210617093154/https://www.historyofcomputercommunications.info/section/8.3/cyclades-network-and-louis-pouzin-1971-1972/ |archive-date=2021-06-17 |url-status=dead}}</ref><ref name=":5">{{cite conference |last1=Davies |first1=Donald |last2=Bartlett |first2=Keith |last3=Scantlebury |first3=Roger |last4=Wilkinson |first4=Peter |date=October 1967 |title=A Digital Communication Network for Computers Giving Rapid Response at remote Terminals |url=https://people.mpi-sws.org/~gummadi/teaching/sp07/sys_seminar/how_did_erope_blow_this_vision.pdf |conference=ACM Symposium on Operating Systems Principles |archive-url=https://ghostarchive.org/archive/20221010/https://people.mpi-sws.org/~gummadi/teaching/sp07/sys_seminar/how_did_erope_blow_this_vision.pdf |archive-date=2022-10-10 |access-date=2020-09-15 |url-status=live |quote=all users of the network will provide themselves with some kind of error control}}</ref> Using this design, it became possible to connect other networks to the ARPANET that used the same principle, irrespective of other local characteristics, thereby solving Kahn's initial internetworking problem. A popular expression is that TCP/IP, the eventual product of Cerf and Kahn's work, can run over "two tin cans and a string."{{citation needed|reason=I can only find possibly circular references for this phrase.|date=November 2017}} Years later, as a [[April Fools' Day|joke]] in 1999, the [[IP over Avian Carriers]] formal protocol specification was created{{Ref RFC|1149}} and successfully tested two years later. 10 years later still, it was adapted for IPv6.{{Ref RFC|6214}}
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IBM, AT&T and DEC were the first major corporations to adopt TCP/IP, this despite having competing [[proprietary protocol]]s. In IBM, from 1984, [[Barry Appelman]]'s group did TCP/IP development. They navigated the corporate politics to get a stream of TCP/IP products for various IBM systems, including [[MVS]], [[VM (operating system)|VM]], and [[OS/2]]. At the same time, several smaller companies, such as [[FTP Software]] and the [[Wollongong Group]], began offering TCP/IP stacks for [[DOS]] and [[Microsoft Windows]].<ref name="TtEPm">{{cite web| url = http://support.microsoft.com/kb/108007| title = Using Wollongong TCP/IP with Windows for Workgroups 3.11| website=Microsoft Support| archive-url=https://web.archive.org/web/20120112105314/http://support.microsoft.com/kb/108007| archive-date = 12 January 2012| url-status=dead}}</ref> The first [[VM/CMS]] TCP/IP stack came from the University of Wisconsin.<ref name="BZHnU">{{cite web|url=http://www.weblab.isti.cnr.it/education/ssfs/lezioni/slides/archives/cern.htm|title=A Short History of Internet Protocols at CERN|access-date=12 September 2016|archive-url=https://web.archive.org/web/20161110200124/http://www.weblab.isti.cnr.it/education/ssfs/lezioni/slides/archives/cern.htm|archive-date=10 November 2016|url-status=dead}}</ref>
Some
The spread of TCP/IP was fueled further in June 1989, when the [[University of California, Berkeley]] agreed to place the TCP/IP code developed for [[BSD UNIX]] into the public ___domain. Various corporate vendors, including IBM, included this code in commercial TCP/IP software releases. For Windows 3.1, the dominant PC operating system among consumers in the first half of the 1990s, Peter Tattam's release of the [[Trumpet Winsock]] TCP/IP stack was key to bringing the Internet to home users. Trumpet Winsock allowed TCP/IP operations over a serial connection ([[Serial_Line_Internet Protocol|SLIP]] or [[Point-to-Point Protocol|PPP]]). The typical home PC of the time had an external Hayes-compatible modem connected via an RS-232 port with an [[8250]] or [[16550]] UART which required this type of stack. Later, Microsoft would release their own TCP/IP add-on stack for [[Windows for Workgroups]] 3.11 and a native stack in Windows 95. These events helped cement TCP/IP's dominance over other protocols on Microsoft-based networks, which included IBM's [[Systems Network Architecture]] (SNA), and on other platforms such as [[Digital Equipment Corporation]]'s [[DECnet]], [[Open Systems Interconnection]] (OSI), and [[Xerox Network Systems]] (XNS).
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