The ISI "Tunnel"

(Maximum 200 words) 14. SUBJECT TERMS 15. NUMBER OF PAGES 16. PRICE CODE 20. LIMITATION OF ABSTRACT 19. SECURITY CLASSIFICATION OF ABSTRACT 18. SECURITY CLASSIFICATION OF THIS PAGE 17. SECURITY CLASSIFICTION OF REPORT USC INFORMATION SCIENCES INSTITUTE 4676 ADMIRALTY WAY MARINA DEL REY, CA 90292-6695 Approved for public release; distribution is unlimited UNCLASSIFIED UNLIMITED UNCLASSIFIED UNCLASSIFIED October 1993 Final Report June 1992 - October 1993 The ISI "Tunnel" C-DABT 63-91-C-0001 DeSchon, Annette and Cohen, Danny ISI/SR-93-358 DARPA 3701 N. Fairfax Drive Arlington, VA 22203-1714 The ISI Tunnel allows sites that are hidden behind "firewalls", also known as "gatekeepers" or "mailbridges ", to have IP-based internet access without being open to attacks over the Internet. The Tunnel is a special router that provides smooth seamless internet access from a closed environment, the "inside", to the "outside" while restricting the access from the outside to the..

ATOMIC: A High-Speed Local Communication Architecture

ATOMIC is an inexpensive high-speed LAN built by USC/ISI. It is based upon Mosaic technology developed for fine-grain, message-passing, massively parallel computation. Each Mosaic processor is capable of routing variable length packets, while providing added value through simultaneous computing and buffering. ATOMIC adds a general routing capability to the native Mosaic wormhole routing through store-and-forward and path concatenation. ATOMIC aggregate bandwidth scales as the number of nodes increases, and it has a small interface cost. Each ATOMIC channel has a data carrying capacity of 500Mb/s. A prototype ATOMIC LAN has been constructed along with host interfaces and software that provides full TCP/IP compatibility. Using ATOMIC, 1,500 byte packets have been exchanged between hosts at an aggregate transfer rate of more than 1Gb/s. Other tests have demonstrated throughput of 5.25 million packets per second over a single Mosaic channel. The architecture is flexible both ..

ATOMIC: A Local Communication Network Created Through Repeated Application of Multicomputing Components

One approach to creating gigabit local area communication technology is to consider it as a wide area network (WAN) that operates over shorter distances. This approach is best exemplified by ATM cell technology and B-ISDN. Another approach considers it to be multicomputer intra-computer communication that operates over longer distances. An example of the latter approach is discussed in this paper. Multicomputer chips have been used at the Information Sciences Institute (USC/ISI) to create a network that bridges the two lowest layers of the networking distance hierarchy: from intra-computer to local area. The ATOMIC network operates between network nodes over distances that scale from a centimeter to many meters. The ATOMIC prototype now consists of six Sun Microsystems workstations interconnected by a network of 500 Mb/s point-to-point channels to a 3 Gb/s mesh router board. Full TCP/IP support is provided. Introduction A multicomputer is a group of independent processor/memory nodes..

ATOMIC: A Low-Cost, Very-High-Speed LAN

ATOMIC is an inexpensive O(gigabit) speed LAN built by USC/ISI. It is based upon Mosaic technology developed for fine-grain, message-passing, massively parallel computation. Each Mosaic processor is capable of routing variable length packets, while providing added value through simultaneous computing and buffering. ATOMIC adds a general routing capability to the native Mosaic wormhole routing through store-and-forward. ATOMIC scales linearly, with a small interface cost. Each ATOMIC channel has a data carrying capacity of 500Mb/s. A prototype ATOMIC LAN has been constructed along with host interfaces and software that provides full TCP/IP compatibility. Using ATOMIC, 1,500 byte packets have been exchanged between hosts at an aggregate transfer rate of more than 1Gb/s. Other tests have demonstrated throughput of 5.25 million packets per second over a single channel. This paper describes the architecture and performance of ATOMIC

ATOMIC: A Low-Cost, Very-High-Speed LAN

ATOMIC is an inexpensive O(gigabit) speed LAN built by USC/ISI. It is based upon Mosaic technology developed for fine-grain, message-passing, massively parallel computation. Each Mosaic processor is capable of routing variable length packets, while providing added value through simultaneous computing and buffering. ATOMIC adds a general routing capability to the native Mosaic wormhole routing through store-and-forward. ATOMIC scales linearly, with a small interface cost. Each ATOMIC channel has a data carrying capacity of 500Mb/s. A prototype ATOMIC LAN has been constructed along with host interfaces and software that provides full TCP/IP compatibility. Using ATOMIC, 1,500 byte packets have been exchanged between hosts at an aggregate transfer rate of more than 1Gb/s. Other tests have demonstrated throughput of 5.25 million packets per second over a single channel. This paper describes the architecture and performance of ATOMIC

Supporting Ecological Research With a Flexible Satellite Sensornet Gateway

The scientific application being addressed at the Stunt Ranch, a 310-acre reserve in the Santa Monica Mountains, is a long-term investigation of the influence of the 2006-07 Southern California drought conditions on the water relations of important chaparral shrub and tree species that differ in their depth of rooting. Rainfall over this past hydrologic year in Southern California has been less than 25% of normal, making it the driest year on record. Measurements will be made using sap flow sensors to continuously monitor the flow of water through the xylem system of replicated stems of four species to compare their access to soil moisture with plant water stress. Core measurements of air temperature, relative humidity, solar irradiance, rainfall, and soil moisture will be monitored continuously at the same site. The project utilizes a flexible satellite Sensornet gateway adapting new Compact RIO technologies under development for NEON