EstiNet 8.1 OpenFlow network simulator and emulator is the best OpenFlow network simulator and emulator in the world for doing Software Defined Networks research. It can accurately simulate thousands of Ver 1.3.4 and Ver 1.0.0 OpenFlow switches. It supports both of the simulation mode and the emulation mode. In the simulation mode, a real-world open source OpenFlow controller such as NOX, POX, Floodlight, or Ryu application program can directly run up on a controller node in the simulated network to control these simulated OpenFlow switches without any modification. In the emulation mode, these controller application programs can run up on an external machine that is different from the machine used to simulate OpenFlow switches to control these simulated OpenFlow switches. In additiion, in the emulation mode, if an OpenFlow controller has been implemented as a dedicated hardware device, it can remotely control the simulated OpenFlow switches in EstiNet 8.1 via an Ethernet cable.
EstiNet 8.1 OpenFlow network simulator and emulator simulates the interactions between the NOX, POX, Floodlight, and Ryu controller application programs and the simulated OpenFlow switches accurately, quickly, and repeatably. An OpenFlow researcher can easily and efficiently test his own controller application program on an EstiNet simultaed OpenFlow network. He can run up his modified controller application program on an EstiNet simulated OpenFlow network without any modification! (This unique capability is due to the innovative "kernel-reentering simulation methodology" used by EstiNet.) Comparing other existing OpenFlow simulators and emulators, one will find that EstiNet 8.1 OpenFlow network simulator and emulator is the most accurate, fast, scalable, and useful OpenFlow network simulator and emulator in the world.
For example, although Mininet OpenFlow emulator can be used as a rapid prototyping for Software-Defined Networks, it has several serious drawbacks and limitations. As said in its own technical paper published in ACM Hotnets 2010, the most significant limitation of Mininet is its lack of performance fidelity because it provides no guarantee that a host in Mininet that is ready to send a packet will be scheduled promply to send the packet and it provides no guarantee that all switches in Mininet will forward packets at the same rate. The packet forwarding capability of a switch in Mininet is unpredictable as it depends on the numbers of hosts and switches that must be multiplexed over a CPU in Mininet. As a result, Mininet can only be used to test the behavior of a controller application program but cannot be used to accurately study network/application performances (e.g., end-to-end achieved throughput or experienced delay) of a data flow in an OpenFlow network controlled by the controller.
In contrast, EstiNet 8.1, when running in the simulation mode, accurately simulates the properties of the links that connect simulated OpenFlow switches. These properties include link bandwidth, link delay, link downtime, and the medium access control (MAC) protocol used over the link (e.g., IEEE 802.3 or IEEE 802.11, etc.). As a result, performance evaluation of data flows or the whole OpenFlow network can be accurately studied in EstiNet 8.1. Furthermore, since during simulation, the advancement of the simulation clock is accurately controlled by EstiNet 8.1, the performance simulation results of EstiNet 8.1 are always realistic and repeatable, totally unaffected by the number of OpenFlow switches and hosts simulated by it. These unique and superior properties are in sharp contrast to those of Mininet and other OpenFlow network simulators and emulators.
A paper entitled "EstiNet OpenFlow Network Simulator and Emulator" has been published in the September 2013 issue of the prestigious IEEE Communications Magazine. In that paper, EstiNet is compared with Mininet and ns-3 regarding their capabilities, performance, and scalability. Interested readers may download that paper from the IEEE Xplore database or get a copy from this link.
In 2014, a paper entitled “Comparison of SDN OpenFlow Network Simulator and Emulators: EstiNet vs. Mininet” was published in the proceedings of IEEE ISCC 2014 (IEEE Symposium on Computers and Communications 2014), June 23-26, 2014, Madeira, Portugal. In that paper, the authors show that EstiNet is more scalable, accurate, and reliable than Mninet. Press this link to get a copy of this paper.
More recently, in 2015 a paper entitled " Comparisons of SDN OpenFlow Controllers over EstiNet: Ryu vs. NOX" has been published in the proceedings of IARIA SOFTNETWORKING 2015 (The International Symposium on Advances in Software Defined Networks), April 19-24, 2015, Barcelona, Spain. In that paper, the authors used EstiNet to compare the functions and protocol behavior of the Ryu and NOX SDN controllers and found their implementation bugs. Press this link to get a copy of this paper.