Does it matter what order you put the '$ns at ...' commands in. i.e. is $ns at 1.0 "$cbr0 start" $ns at 2.0 "$cbr0 stop" the same as $ns at 2.0 "$cbr0 stop" $ns at 1.0 "$cbr0 start" ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com