HISTORY OF NS-2
ns began development in 1989 as a variant of the REAL network simulator and it is currently maintained by volunteers. Long-running contributions have also come from Sun Microsystems and the UCB Daedelus and Carnegie Mellon Monarch projects
ns-2 was built in C++ and provides a simulation interface through OTcl, an object-oriented dialect of Tcl.
The user describes a network topology by writing OTcl scripts, and then the main ns-2 program simulates that topology with specified parameters. It runs on Linux, FreeBSD, Solaris, Mac OS X and on Windows using Cygwin. It is licensed for use under version 2 of the GNU General Public License
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