OPNET Screen Network Editor Network Editor showing the structure of a subnet (FDDI Ring in this case) Node Editor showing the node level structure of Area Border Router Node Editor showing the node level structure of FDDI Gateway Node Editor showing the node level structure of host in FDDI ring Process Editor showing the process diagram of IP module Process Editor showing the process diagram of QOSPF module Process Editor showing the process diagram of RSVP module Process Editor showing the process diagram of IGMP module Parameter Editor Parameter Editor showing the format of the IP datagram Probe Editor Probe Editor showing the probe written for the simulation Analysis Tool Sample screen of the analysis tool when a probe file is read email from A. Avella on porting our models to OPNET 4.0