Dear all, Now I meet a tough problem that I can not configure ns . when I run ns in command line prompt. It gives me that information : "When configured, ns found the right version of tclsh in /home/wjw101/ns-allinon e-2.30/bin/tclsh8.4<BR>but it doesn't seem to be there anymore, so ns will fall back on running the fir st tclsh in your path. The wrong version of tclsh may break the test suites. Rec onfigure and rebuild ns if this is a problem.<BR>%" I can also run TCL script, but when i modified the *.cc and *.h file and run make make depend make command, I find that modification does not work , I do not konw why it is. my system configuration is that: intel cpu , fedora core 5 linux, ns-2.30 . I install ns-2.30 in wjw100,wjw101,wjw103 user. any advice and help will be appreciated! So I am appreciate you a lot for that I have a lot experiment to do in it. yours sincerely Wang Junwei 2007/03/05