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TCP/UDP Bandwidth Sharing Analysis using ns-2 Simulation

This assignment focuses on analyzing TCP and UDP bandwidth sharing using ns-2. You will configure, script, and run simulations based on existing ns-2 modules, particularly examining transport protocols (TCP, UDP) and queue management techniques (FIFO DropTail, Deficit Round Robin). The goal is to collect and interpret simulation results to understand bandwidth allocation differences between FIFO and DRR. Key tasks include writing ns-2 scripts for both queueing methods, processing simulation traces with Perl/Awk, and submitting analysis on TCP and UDP performance at the bottleneck link.

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TCP/UDP Bandwidth Sharing Analysis using ns-2 Simulation

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  1. Assignment #2 Due Sunday Sept 17, 11:55pm

  2. Objectives • Getting to know ns-2 • Manipulate ns-2 as a black box. • Configure/Script & run simulations based upon pre-existing ns-2 modules for • Transport (TCP, UDP), and • Queueing/buffer management (deficit round robin scheduling, FIFO DropTail) • Collect and interpret results from simulation • Understand what it means to say that scheme A is better than scheme B using simulation evidence. Shivkuma@ecse.rpi.edu

  3. Assignment #2 • Scenario: TCP/UDP bandwidth sharing analysis 1Mbps, 5ms n0 CBR/UDP, 0.1s ~ 5.0s 600Kbps, 10ms n3 n2 FTP/TCP, 0.1s ~ 5.0s 1Mbps, 5ms • DropTail • DRR n1 • TCP is expected to get a lower allocation when FIFO Droptail is used at n2. • Show this using ns-2 simulation. Shivkuma@ecse.rpi.edu

  4. Contd… • By using Deficit Round Robin (DRR) scheduling, we expect to isolate UDP from TCP • This should lead to a fairer bandwidth allocation than FIFO DropTail. • Show this using ns-2 simulation Shivkuma@ecse.rpi.edu

  5. Submission • Write ns2 script for each case (FIFO droptail & DRR) using the topology shown on Slide 3. • Metric: Percentage of link n2-n3 bandwidth obtained by TCP and UDP respectively. • Measure this using ns2 traces (the .tr file) & process it using a Perl/Awk script. • Repeat for the two cases (FIFO DropTail and DRR). • Submit: • Ns2 simulation script; • Post-processing program to process the trace (eg. Awk, perl, etc.); • Your analysis of capacity sharing at bottleneck link n2n3 of TCP and UDP sources, compared to what one would expect in each case. • All in text format. • Due Sunday Sept 17, 11:55pm Shivkuma@ecse.rpi.edu

  6. GRADUATE STUDENTS: Additional Task • Browse the ns-2 manual and David Harrison’s graphing tutorial. You need to be very comfortable with ns-2 for your research project. • ns-2: Briefly discuss the different ways in which the oTcl portion of ns-2 interfaces with the C++ portion (hooks, bindings, tracing, shadow objects, command methods, embedded tcl, instvar etc). • Graphing/Animation: Give an example of when animation more useful in eliciting performance information than what is possible with a collection of graphs? Vice-versa: when would you prefer graphs to animations? • Models: Briefly summarize the various model options available in ns-2 at the transport layer, application layer, routing layer and queue layer. Shivkuma@ecse.rpi.edu

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