Computer Networks NS. Features F Event driven simulator –developed at UC Berkeley F Network Topologies –nodes (connectivity), links (bandwidth, delay)

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Presentation transcript:

Computer Networks NS

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

Overview F Write TCL scripts F Run, get NS tracefile and NAM tracefile F Visualize NAM tracefile F Analyze NS tracefile

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

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

Analysis F Scripts/Programs in Perl, C, Shell –see stats.pl

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

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