Welcome to the OMNeT++ Community!

OMNeT++ is an extensible, modular, component-based C++ simulation library and framework, primarily for building network simulators. "Network" is meant in a broader sense that includes wired and wireless communication networks, on-chip networks, queueing networks, and so on. Domain-specific functionality such as support for sensor networks, wireless ad-hoc networks, Internet protocols, performance modeling, photonic networks, etc., is provided by model frameworks, developed as independent projects. OMNeT++ offers an Eclipse-based IDE, a graphical runtime environment, and a host of other tools. There are extensions for real-time simulation, network emulation, alternative programming languages (Java, C#), database integration, SystemC integration, and several other functions.

OMNeT++ is free for academic and non-profit use, and it is a widely used platform in the global scientific community. Commercial users must obtain a license from More...

Featured Projects:

   INET Framework (Internet and LAN protocols)   INETMANET (mobile and ad-hoc networks)   Oversim (peer-to-peer networks)   Veins - Vehicles in Network Simulation    ReaSE (realistic Internet simulations)   MiXiM (detailed wireless simulations)   Castalia (wireless sensor and body area networks)   More...

New users: Watch the screencast for an introduction into the Simulation IDE, or see in the publications list what OMNeT++ has been used for. Check out some tutorials, browse the documentation, watch introductory videos, and explore the featured network simulation projects (click the logos above)!

OMNeT++ 4.2 released
Thursday, 17 November 2011 14:12
Dear everybody, we're happy to announce the release of OMNeT++ 4.2. Please read the ChangeLog (below) to see what has changed since the 4.1 version and check the Visual ChangeLog to see the changes in the IDE. Download it now.
OMNeT++ 4.2rc2 released (final RC)
Tuesday, 08 November 2011 14:37
We've just released the second (and final) release candidate of OMNeT++ 4.2. Please read the ChangeLog carefully to see what has changed since the 4.1 version. Please report all bugs ASAP! Download and try it now.
Call for Papers -- 5th International Workshop on OMNeT++
Friday, 21 October 2011 14:22

The 5th International OMNeT++ Workshop will be held on March 23, 2012 in Sirmione, Italy. You can submit full papers (up to 8 pages), short papers (up to 4 pages) and code contribution papers (2 pages) until November 28, 2011. Participate, show your work, meet others who work with OMNeT++, and exchange ideas! All accepted full and short papers will be indexed, and selected papers will be considered for an international journal publication. The workshop will be held in conjunction with SIMUTools 2012. Read the full Call for Papers!

OMNeT++ 4.2rc1 released
Monday, 12 September 2011 00:00
We've just released the first release candidate of OMNeT++ 4.2. Please read the ChangeLog carefully to see what has changed since the 4.2b2 version. Download and try it now. Please report any issues you encounter.
Horizon – Scalable Parallel Network Simulation
Wednesday, 08 June 2011 11:27

Horizon is a parallel simulation extension of OMNeT++ that focuses on multicore and/or multiprocessor machines. Horizon employs a centralized (master-worker) parallel event execution scheme which uses a conservative synchronization algorithm. This synchronization scheme is based on a new modeling paradigm that annotates discrete events with durations in order to create an opportunity for parallel processing. Horizon was originally written for OMNeT++ 3.3, and has been ported to 4.x recently.

Horizon home page:

OMNeT++ 4.2b2 released
Thursday, 05 May 2011 00:00
Dear users, we've just released the second beta of OMNeT++ 4.2. Please read the ChangeLog carefully to see what has changed since the 4.1 version. Download and try it now.
HNOCS - Network on Chip Simulation Framework
Wednesday, 09 March 2011 10:43
NoC simulation is a key for NoC architectures research resulting from the huge incurred cost of VLSI prototypes production using modern manufacturing processes. Although several NoC simulators exist, they are either proprietary or built on non standard infrastructure. HNOCS is an open-source implementation of a NoC simulation framework using OMNeT++. The HNOCS framework utilizes the OMNeT++ module interface feature to support runtime selection of simulation modules from a library of parametrized components. For example by setting the opCalcType parameter from "XY" to "XY/YX" the simulation change to use a different output port selection algorithm. The models provided support heterogeneous NoC configuration in terms of link capacity and number of VCs. HNOCS modules available today implement wormhole switching, with round-robin or winner-takes-all arbitration. Current version of HNOCS contains different router implementations: synchronous, asynchronous and a full virtual output queuing (VOQ) with FIFO for each (input VC, output VC and output port) tuple.

Go to the homepage at: or v
isit the model page.

OMNeT++ 4.2b1 released
Wednesday, 23 February 2011 00:00
Dear users, we've just released the first beta of OMNeT++ 4.2. Please read the ChangeLog carefully to see what has changed since the 4.1 version. Download and try it now.
OMNeT++ Workshop -- Call for Participation
Friday, 11 February 2011 10:37

The program for the 4th International OMNeT++ Workshop is now available online.

Early registration deadline: February 21, 2011
Workshop: March 21, 2011 (Barcelona, Spain)

The continuing goal of this workshop is to bring together OMNeT++ developers and their tools, applications and ideas. It provides a forum for presentations of recent developments and novel ideas in the broad area of network simulation, with focus on OMNeT++ and on the important topics of integrating simulation models, coupling different simulation tools and providing more accurate and more efficient modeling approaches...

Castalia 3.1 Released
Thursday, 03 February 2011 09:18
Castalia developers have released version 3.1 of Castalia, a simulator for Wireless Sensor Networks (WSN), Body Area Networks (BAN) and generally networks of low-power embedded devices. The main new feature is a tool to automatically create graphs based on output from the CastaliaResults script. It also enhances the functionality of TunableMAC and provides several bug fixes. Castalia is developed in the Networked Systems theme at NICTA (Australia) since 2007.
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