Hi all! anybody has a problem similar to me? i used queue monitor agent to get number of packets which are available in buffer, the result i got is the number of packets reached to thousands, and sometime it droped to negative number, where is error, somebody told me that interactivity of modules in NS has a problem, it's true? currently,i use NS-2.31, i have had no any problem before. would somebody please to help me? thanks in advance! Hang -- khicon the FET of HUT