Hi, I posted the question before with no replies so am narrowing down I am trying some examples in / tcl/ex When I tried to run srm-drmo.tcl I got the following error ns: _o450 recv 28 0: no value given for parameter "m" to "_o450" (Agent/Mcast/Control recv line 1) invoked from within "_o450 recv 28 0" Does anyone know what the error means ? thanks thanks ....... -chirdeep