Hi, Could anybody tell me what is the "r" means in the output file? + 0.006 2 3 tcp 1000----0 0.0 3.0 0 0 - 0.006 2 3 tcp 1000----0 0.0 3.0 0 0 r 0.012 2 3 tcp 1000----0 0.0 3.0 0 0 + 0.02808 2 3 tcp 1000----0 0.0 3.0 0 0 ..... The ns manual has "d" instead of "r", I run several times, the results are same. I could not figure out what is "r" means? Thanks zutong [email protected]