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OPNET
Modeler® accelerates the R&D process for analyzing and designing
communication networks, devices, protocols, and applications. Users can analyze
simulated networks to compare the impact of different technology designs on
end-to-end behavior. Modeler incorporates a broad suite of protocols and
technologies, and includes a development environment to enable modeling of all
network types and technologies including:

* VoIP
* TCP
*
OSPFv3
* MPLS
* IPv6
* Others

Key Features:
* Fastest
discrete event simulation engine among leading industry solutions
* Hundreds
of protocol and vendor device models with source code (complete list)
*
-oriented modeling
* Hierarchical modeling environment
* Discrete
Event, Hybrid, and optional Analytical simulation
* 32-bit and 64-bit fully
parallel simulation kernel
* Grid computing support for distributed
simulation
* Optional System-in-the-Loop to interface simulations with live
systems
* Open interface for integrating external files, libraries,
and other simulators
* Integrated, GUI-based debugging and
analysis

HomePage: http://www.opnet.com