Hello. I'm graduate student in Chungnam Nat. Univ. in S. Korea. I don't know whether most recent release of ns is "ns-2.0a17" or "ns-2.0b17". I downloaded source "most recent release(ns-2.0a17 released 25-Jul-97)" in web page 'UCB/LBNL Network Simulator: Building Ns', but it was "ns-2.0b17". Please, help me..... Thank you in advance.