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Computer Networks

Computer Networks. NS. Features. Event driven simulator developed at UC Berkeley Network Topologies nodes (connectivity), links (bandwidth, delay) Transport Protocols UDP, TCP (flavors) Applications Web, FTP, CBR ... Router Queue Management Drop-Tail, RED, CBQ. Overview.

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Computer Networks

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  1. Computer Networks NS

  2. Features • Event driven simulator • developed at UC Berkeley • Network Topologies • nodes (connectivity), links (bandwidth, delay) • Transport Protocols • UDP, TCP (flavors) • Applications • Web, FTP, CBR ... • Router Queue Management • Drop-Tail, RED, CBQ ...

  3. Overview • Write TCL scripts • Run, get NS tracefile and NAM tracefile • Visualize NAM tracefile • Analyze NS tracefile

  4. Running • On shiraz.wpi.edu (Linux box) • need passwords • In: /usr/local/ns-allinone-2.1b5/bin • add to path • Running: • ns dooda.tcl • Output: • dooda.nam and dooda.tr

  5. Visualization • nam dooda.nam • Right-click to get loss and utilization

  6. Analysis • Scripts/Programs in Perl, C, Shell • see stats.pl

  7. Experiments • Fairness and congestion • TCP vs. TCP • Robust TCP vs. Fragile TCP • TCP vs. UDP • Drop-Tail vs. RED • (FRED vs. RED)

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