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Analyzing TCP Flows and DiffServ in Network Simulation with OPNET

This project utilizes the OPNET Simulator to examine the performance of five TCP flows amidst a DiffServ network configuration. Each flow originates from different sources generating Poisson traffic, with defined parameters such as a mean packet generation rate of 0.25 Mbps and a TCP segment size of 1480 bytes. The simulation will measure queue lengths, throughput, and congestion effects, analyzing FIFO queuing with Drop Tail and comparing it to Random Early Detection (RED). A comprehensive report summarizing findings will be submitted, along with a demonstration in the lab.

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Analyzing TCP Flows and DiffServ in Network Simulation with OPNET

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  1. A A A B Computer Networks Project-2 (20%) – DiffServ and TCP Congestion Control • Use OPNET Simulator (PC version) to setup five TCP flows (A to A, B to B, etc.) in the above parking-lot configuration. Each physical link is assumed to have a bandwidth of 100 Mbps, and each link propagation delay is assumed to be 100 us. • Assume A, B, C, D, and E generate Poisson traffic, respectively. Each TCP flow has (1) Mean packet generation rate = 25 Mbps. (2) IP packet length = 1500 bytes. (3) Queuing discipline in routers: FIFO with Drop Tail. (4) Buffer size = adjustable between 1 to 5 packets. • ECN: Once congestion occurs in a router, the ECN field in IP header is set. The ECE (ECN Echo) bit in TCP header is set by the receiver on every ACK packet until the CWR flag is received. R3 R4 C R1 R2 R5 B D D E C E

  2. TCP Parameters: (1) Assume TCP-Reno is used. (2) Max. TCP Segment Size = 1480 bytes. (3) Segment Processing Time = 1 msec. (4) Receiver’s Window Size = 20 Segments. (5) Enable Slow Start, i.e., Initial cwnd = 1 Segment. • In the Simulation: (1) Show the buffer occupancy (queue length) for every router vs simulation time. (2) Show the throughput (Mbps) for every TCP flow vs router buffer size. (3) Show the variations of cwnd for every TCP flow vs simulation time. (4) Count packet loss rate in every router by assuming router’s buffer size = 2 packets. (5) Repeat (1) to (4), assume RED is enabled. Discuss on the improvements with and without enabling RED. Assume buffer size = 5 packets. Set up THmin = 2 packet and TH max = 4 packets. • Due Day: Demo on May 26, 27, 28, 2008. Report due on May 30, 2008. • Deliverable Results: (1) Demo at F8010 Lab. (2) A 15-page report including discussions and all the figures. • Where to download the OPNET Simulator (PC version): 140.117.164.20/pub/CN/proj2 (User ID: anonymous)

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