Defense Data Network

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The Defense Data Network ( DDN ) was a computer network operated by the US Department of Defense from 1983 to 1995.

history

In 1975 the Defense Communication Agency (DCA; today Defense Information Systems Agency (DISA)) took over the operation of the ARPANET and raised the system from the status of a research project to the status of a productive system. In 1983 plans for a new generation of the Automatic Digital Network (Autodin II) were dropped. Instead, a network for connecting military facilities was split off from the ARPANET; this network was called MILNET . The ARPANET was as an Internet - Backbone used for research purposes, but should be shut down slowly. Both networks transmit unclassified material and were connected to one another at a few points, so that in an emergency it was possible to quickly and completely separate the networks. The DCA used the term Defense Data Network (DDN) as a program name for several networks.

As a large, private Internet, the DDN provided IP connections across the USA and to US bases outside the USA. In the course of the 1980s, the network split into four parallel military networks, each with its own security level. These networks became the successor networks NIPRNet , SIPRNet and JWICS in the 1990s .

The four DDN subnets were:

  • Military Network (MILNET) for unclassified traffic
  • Defense Secure Network One (DSNET 1) for data traffic up to the classification Secret
  • Defense Secure Network Two (DSNET 2) for data traffic up to the top secret classification
  • Defense Secure Network Three (DSNET 3) for Top Secret / Sensitive Compartmented Information (TS / SCI)

MILNET and DSNET 1 were simple user networks, similar to the public Internet, while DSNET 2 was explicitly intended to support the American Worldwide Command and Control System (WWMCCS) and DSNET 3 was explicitly intended to support the US military intelligence service.

DDN NIC

The DDN-NIC or Network Information Center (NIC) was located in the DDN Installation and Integration Support (DIIS) program office in Chintilly, Virginia. He provided general service for DDN users via telephone, email and US mail. It was the body responsible for assigning TCP / IP addresses and AS numbers.

See also

Web links

Individual evidence

  1. ^ John Pike, Maintained by Steven Aftergood: Defense Data Network (DDN), Defense Secure Network (DSNET) . Federation of American Scientists . February 11, 2000. Retrieved April 9, 2011.
  2. ^ Fritz E. Froehlich, Allen Kent: ARPANET, the Defense Data Network, and Internet . In: The Froehlich / Kent Encyclopedia of Telecommunications , Volume 1. CRC Press, 1990, ISBN 978-0-8247-2900-4 , pp. 341-375.
  3. ↑ DDN Network Information Center (NIC) . Hytelnet: 1st Directory of Internet Resources. 1995. Retrieved April 11, 2013.