Ns3 Projects for B.E/B.Tech M.E/M.Tech PhD Scholars.  Phone-Number:9688312542   E-mail:ns3simulation@gmail.com

Modeling and Tools For Network Simulation

Network simulation:

  • The principal idea of network simulation is that if a system can be modeled, then features of the model can be changed and the corresponding results can be analyzed.
  • As the process of model modification is relatively cheap than the complete real implementation, a wide variety of scenarios can be analyzed at low cost (relative to making changes to a real network).



  • NS3 is not an updated version of NS2 since that NS3 is a new simulator and it is not backward-compatible with NS2.
  • Ns3 network simulator is Written in C++ and released under the terms of the GNU GPLv2.


Features of ns3:

  • Supports incorporation of more open-source networking software and reduce the need to rewrite models for simulation
  • Core of ns3 is written in C++ and with Python scripting interface and also several advanced C++ design patterns are used
  • Lightweight virtual machines are used.
  • Protocol entities are designed to be closer to real computers etc.


Smart pointer in ns3:

  • It’s automatically free the memory used by the pointer only when the last reference is destroyed
  • If a function returns a smart pointer, the programmer need not take any specific action to free the memory
  • Rather than you just let the pointer variable go out of scope
  • It’s created by using the CreateObject.
  • Example as follows,

Ptr<UdpSocketImpl> socket = CreateObject<UdpSocketImpl>();


  • Smart Pointers are returned by many of the ns–3 functions
  • For example Ptr GetNode () const;