NS2是研究所時候玩的一個Network Simulator，今天忽然心血來潮的回味一下，下載網址。
我下載了ns-allinone-2.35-RC4，解開後執行裡面的install即可。安裝過程中，我只有遇到can't find X includes：
checking for X11 header files can't find X includes otcl-1.14 configuration failed! Exiting ... Please check http://www.isi.edu/nsnam/ns/ns-problems.html for common problems and bug fixes. 透過安裝libsx-dev即可解決 sudo apt-get install libsx-dev
安裝成功後應該會出現一些重要的訊息，包含將執行目錄加到您的PATH中：
Please put ns-allinone-2.35/bin:ns-allinone-2.35/tcl8.5.8/unix:ns-allinone-2.35/tk8.5.8/unix
into your PATH environment; so that you'll be able to run itm/tclsh/wish/xgraph.
IMPORTANT NOTICES:
(1) You MUST put ns-allinone-2.35/otcl-1.14, ns-allinone-2.35/lib,
into your LD_LIBRARY_PATH environment variable.
If it complains about X libraries, add path to your X libraries
into LD_LIBRARY_PATH.
If you are using csh, you can set it like:
setenv LD_LIBRARY_PATH <paths>
If you are using sh, you can set it like:
export LD_LIBRARY_PATH=<paths>
(2) You MUST put ns-allinone-2.35/tcl8.5.8/library into your TCL_LIBRARY environmental
variable. Otherwise ns/nam will complain during startup.
After these steps, you can now run the ns validation suite with
cd ns-2.35; ./validate
For trouble shooting, please first read ns problems page
http://www.isi.edu/nsnam/ns/ns-problems.html. Also search the ns mailing list archive
for related posts.
接下來就是執行一下ns2內建的一些tcl檔：
brook@ubuntu:~/src/ns2$ PATH=/home/brook/src/ns2/ns-allinone-2.35/bin:/home/brook/src/ns2/ns-allinone-2.35/tcl8.5.8/unix:/home/brook/src/ns2/ns-allinone-2.35/tk8.5.8/unix:$PATH brook@ubuntu:~/src/ns2$ ns ns-allinone-2.35/ns-2.35/tcl/ex/simple.tcl 210 0.0037499999999999999 running nam...
