1.Ns 2 is used for wired and wireless simulation wheras ns3 is used for internet simulation.
2.NS3 is not backward compatible with NS2; it's built from the scratch to replace NS2.
3.NS3 is written in C++, Python Programming Language can be optionally used as an interface.
4.NS3 is trying to solve problems present in NS2.
5. There is very limited number of contributed codes made with NS3 compared to NS2
6. In NS2, bi-language system make debugging complex (C++/Tcl), but for NS3 only knowledge of C++ is
enough (single-language architecture is more robust in the long term).
7.NS3 has an emulation mode, which allows for the integration with real networks.
2.NS3 is not backward compatible with NS2; it's built from the scratch to replace NS2.
3.NS3 is written in C++, Python Programming Language can be optionally used as an interface.
4.NS3 is trying to solve problems present in NS2.
5. There is very limited number of contributed codes made with NS3 compared to NS2
6. In NS2, bi-language system make debugging complex (C++/Tcl), but for NS3 only knowledge of C++ is
enough (single-language architecture is more robust in the long term).
7.NS3 has an emulation mode, which allows for the integration with real networks.
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