Defense Data Network

The Defense Data Network (DDN ) was a computer network which has been operated by the U.S. Department of Defense from 1983 to 1995.

History

In 1975, took over the Defense Communication Agency (DCA, and today the Defense Information Systems Agency ( DISA ) ) the operation of the ARPANET and lifted the system from the status of a research project in the state of a production system. In 1983, plans for a new generation of the Automatic Digital Network ( Autodin II) have been dropped. Instead, a network to connect military installations was cleaved from the ARPANET, this network was called MILNET. The ARPANET was used as an Internet backbone for research purposes, but should be turned off slowly. Both networks transmit unclassified material and were linked in a few places with each other, so that in an emergency it was possible to separate the networks quickly complete. The DCA used the term Defense Data Network ( DDN) as a program name for multiple networks.

As a large-sized, private internet, put the DDN IP connections across the U.S. and U.S. military bases outside the USA. In the course of the 1980s the network was divided into four parallel military networks, each with its own level of security. These networks were NIPRNet in the 1990s with the successor network, SIPRNet and JWICS.

The four DDN subnetworks were:

• Military Network ( MILNET ) for unclassified traffic
• Defense Secure Network One ( DSNET 1) for data traffic to the classification Secret
• Defense Secure Network Two ( DSNET 2) for 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 like the public Internet, while DSNET 2 were explicitly explicitly designed to support the American Worldwide Command and Control System ( WWMCCS ) and DSNET 3 in support of U.S. military intelligence.

DDN NIC

The DDN NIC or Network Information Center ( NIC) based in the DDN Installation and Integration Support ( DIIS ) program office in Chintilly, Virginia. He presented general service for DDN users via telephone, e -mail and U.S. mail. It was the body responsible for the allocation of TCP / IP addresses and AS numbers.