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Testbed@TWISC (i.e. Testbed@NCKU) is an integrated network emulator based on the Emulab system authorized from the University of Utah since 2005. It is built with domestic-manufactured hardware and customized software environment and can be accessed through a simple Web interface. This testbed provides heterogeneous nodes for network researchers which fulfills the requirements of being quarantined, closed, recordable, controllable and storable on virtualized environment. All experiment nodes are capable of running multiple operating systems, or as a simulated router, traffic-shaper or traffic-generator. After experiment creation, each user can independently control all resources including owning root access on all machines in the experiment. All the software you run on it, including all bits on the disks, are replaceable and entirely your choice. The same applies to the network characteristics, including its user configurable topology.
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Emulab is a network testbed, giving researchers a wide range of environments in which to develop, debug, and evaluate their systems. The name Emulab refers both to a facility and to a software system. The primary Emulab installation is run by the Flux Group, part of the School of Computing at the University of Utah. There are also installations of the Emulab software at more than two dozen sites around the world, ranging from testbeds with a handful of nodes up to testbeds with hundreds of nodes. Emulab is widely used by computer science researchers in the fields of networking and distributed systems. It is also designed to support education, and has been used to teach classes in those fields.