NS3 is very powerful and free since it is open source. Opnet is not free, but is also a very good simulator. If you have someone to fund you, you can go for Opnet as they also provide support. NS3 support is primarily via its google group... Both these simulators support adhoc routing...
NS3 is way more complicated (and more detailed and configurable) than Opnet and Opnet needs commercial license.
Did you consider Omnet++?
https://omnetpp.org
My suggestion is OMNet++. The reason why is that it is open source and power full for simulation.
Opnet or Omnet++? if it is Omnet vs Ns3, both can solve your objectives, probably the learning curve is better in omnet, the election of one or other depends if the protocol that you want is alredy implemented in one of both and if there are more people in your group that use one of them.
Both can be used in the simulation of routing protocols in ad hoc network. In my opinion, ns3 is better because the result more accurate.
If you are a beginner then first try OMNET++ as it is free and provide you more flexibility to practice problems related to adhoc networks and routing...
NS-2 is no longer used, NS-3 is incredibly complex and will take you many months to even understand. I would recommend using OPNET or NETSIM.
I recommend NS-3 and Omnet++. The latter is more appropriate for beginners.
NS-3 is a very powerful and versatile simulator with a huge support base, mainly because it is open source. However, it has a steep learning curve. I would recommend NS-3 anyday.
The main advantage of ns-3 is its a open source and you can find more and more examples in it. Also, you can get good support from community.
Ns-3 is quite tough. Installation and running itself took a long time. And then learning concepts like callback \ Trace source \ Data collection etc takes a lot of efforts to understand.
I have found NetSim much simpler to use and also more powerful since we can easily integrate with other tools like MATLAB, SUMO etc.
Also, I have heard OMNET is a easier simulator.
Thank you very much every one of you. Your cordial cooperation will help me to do my job.
NetSim is more easy and useful for routing optimization purpose. its good feature is that you can interface NetSim with Matlab, sumo, wireshark etc for analysis purpose.
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