On Mon, 26 Jul 1999, Rajesh Khetan wrote: > Hi, > > I was going thru the tcp header in tcp.h & realized that there was no > source & destination port in it. > > Could someone tell why is so..?? It's because they're not needed. In the ip header, the src and dst fields contain both the node id of the src/dst, and the agent id within the node. See the code in ns-lib.tcl, in proc "connect". George