參考網站： http://www.anand-iyer.com/blog/?p=22
這個網站的設定動作，是我找到最簡單的～～

操作動作如下：
I spent a reasonably long time getting NS-2 (ns-allinone-2.34) to work in Ubuntu 10.04. Here’s how I finally did it:

1. Install necessary tools for building:

sudo apt-get install build-essential autoconf automake libxmu-dev gcc-4.3

2. It turns out that otcl does not like the version of gcc installed by default in Lucid. So go ahead and change ns-allinone-2.34/otcl-1.13/Makefile.in. Find the line that says:

CC= @CC@

and change it to:

CC= gcc-4.3

3. Now try doing ‘./install’ from the ns-allinone-2.34 directory. It should work.

以上動作完成後，使用 gedit ~/.bashrc ，將底下的內容貼到最下方，記得將 /opt/ 修改 為你解開 ns-allinone 的路徑。

export PATH=$PATH:/opt/ns-allinone-2.34/bin:/opt/ns-allinone-2.34/tcl8.4.18/unix:/opt/ns-allinone-2.34/tk8.4.18/unix
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/ns-allinone-2.34/otcl-1.13:/opt/ns-allinone-2.34/lib
export TCL_LIBRARY=$TCL_LIBRARY:/opt/ns-allinone-2.34/tcl8.4.18/library

重新登入系統後，執行 ns 就會跳出 % 提示字元，應該就表示可以正常使用囉～～