Ns network simulator

ns network simulator Edwin Hernandez January 19 th , 2001 Harris Lab Seminar

Background on ns ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Characteristics of ns ,[object Object],[object Object],[object Object],[object Object]

Installation process for ns ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The starting point ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A test script for ns ,[object Object],[object Object],[object Object],set ns_ [new Simulator] $ns_ at 1 “puts hello world” $ns_ at 1.5 “exit” $ns_ run

Creating the network nodes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Creating TCP traffic ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Creating TCP Traffic ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Creating UDP traffic ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Polling the LossMonitor proc record {sink} { global fthrput fpcklost #Get an instance of the simulator set ns [Simulator instance] #Set the time for polling set time 0.25 #How many bytes have been received by the traffic set bw1 [$sink set bytes_] set lpkts [$sink set nlost_] set now [$ns now] puts $fthrput "$now [expr $bw1/$time*8]" puts $fpcklost "$now $lpkts" #Reset the bytes_ values on the traffic sinks $sink set bytes_ 0 $sink set nlost_ 0 #Re-schedule the record function $ns at [expr $now+$time] "record sink" }

Creating UDP traffic ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Creating UDP traffic ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Wireless extensions ,[object Object],[object Object],[object Object]

Simulation of two wireless nodes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Simple wireless simulation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Configuring the wireless/phy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Important initialization variables ,[object Object],[object Object],[object Object],[object Object],[object Object]

Creating the mobile nodes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Adding movement to the nodes ,[object Object],[object Object],[object Object],[object Object]

Tracing the node movement and traffic information ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

New trace format ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

We can visualize the trace/nam files Network animator screenshots of an ad-hoc network simulation (courtesy of S. Shah)

ns-2 can be modified ,[object Object],[object Object],class TwoRayGround : public Propagation { public: TwoRayGround(); virtual double Pr(PacketStamp *tx, PacketStamp *rx, WirelessPhy *ifp); protected: double TwoRay(double Pt, double Gt, double Gr, double ht, double hr, double L$ double last_hr, last_ht; double crossover_dist; };

For more internals and how to modify ns ,[object Object],[object Object],[object Object],[object Object]

Ns network simulator

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