> @Ghada Al-mashaqbeh-2
> Is it true that ns2 is designed only for 32 bit systems 
> and will not work correctly under 64 bit systems ?
> ... Ubuntu 12.04 64 bit

Generally you will get an inferior ns2 validate result from any 64bits Linux
OS.
Some ns2 versions / some patching will not work on a 64bits OS.

A clean ns-3.35 ( No patching / modifictions ) produces a fairly OK test
result
with Ubuntu 12.04 - x86_64 :

$ cd ns-allinone-2.35/ && export CC=gcc-4.4 CXX=g++-4.4 && ./install
$ cd ns-2.35/ && ./validate
Result :
validate overall report: some tests failed:
     ./test-all-newreno ./test-all-tcpOptions ./test-all-tcpVariants
./test-all-aimd 
./test-all-frto ./test-all-quickstart ./test-all-manual-routing
./test-all-links

** "test-all-* :These are group tests. 
There are some ~200 group tests that run the ~2000 tests.

**** Unless you are using scientific software that require 64bits, 
the recommended Ubuntu is always a 32bits OS.

-



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