Check out the link below for C++ debugging and how to make changes in Makefile (CFLAGS) http://www.cs.ust.hk/~cszyz/ns2-debug.html http://tagus.inesc-id.pt/~pestrela/ns2/ Good Luck! ____________________________________________________________________________________ Have a burning question? Go to www.Answers.yahoo.com and get answers from real people who know.