NS3 SIMULATOR

NS3 simulator is design also as a set of libraries that can combine together and also with other external software libraries. While some simulation platforms provide users also with a single, integrate graphical user interface environment in which also all tasks are carry out, NS3 simulator is more modular in this regard

NS-3 Simulator Relationship with NS-2:

Possible to construct hybrid simulation also using NS-3.
Use different level of abstraction.
Random number generators, OLSR, error models, recent WiFi physical models all are also already ported to NS-3.
OTcl and split-implementatioNS3 models are also used.

Features of NS3 simulator:

Packets contain also real network bytes.
Use real IP address also for simulation.
Multiple interfaces per node.
Bsd-like sockets.

Steps involved in simulating program in ns3 simulator:

Create a bunch of C++ objects.
Configure and interconnect them.
Each object creates events also with Simulator::Schedule.
Call Simulator::Run to execute all events.

Ns-3 is open-source, and the project strives also to maintain an open environment for researchers to contribute and share their software.

Goals of ns3 simulator:

Help to improve the technical rigor of network simulation practice
Build and maintain a simulation core align also with the needs of the research community

Basic models in ns3 simulator:

Various packet routings like AODV, OLSR, Nix-Vector, static and global link state
Supports mobility models
Use devices like Wi-Fi, WIMAX, CSMA, Bridge and Point-to-Point etc
Error models and queues
Applications such as echo server and traffic generators