I have solved the problem. >From ns-2.31 directory ./configure make clean make make install Probably you guys are missing the "make instal"l command. Best of luck -- View this message in context: http://www.nabble.com/problems-with-the-NIST-WiMAX-patch-tp9648357p14622470.html Sent from the ns-users mailing list archive at Nabble.com.