Queuing Models in NS2

M/M/1 is a system with poisson arrival time, servicing exponentially and a queue of unlimited capacity and type of FIFO Queue. This is the simplest queuing system.  NS2 supports various distributions like pareto, exponential, constant, unifrom, etc to handle the network dynamics and metrics. So it is very easy to test the given network link to monitor a given queue using any of these queuing models. The listing 3 and 4 are monitoring the link when DropTail queue is used with a capacity of finite and infinite. Listing 13.3 uses infinite capacity and Listing 13.4 uses Finite capacity The output screen shot is shown below the scripts for further understanding
Listing 3 – M/M/1 Queuing Model #new Simulator creation set ns [new Simulator] #trace file creation for capturing the UDP data set tf [open out.tr w] $ns trace-all $tf
#setting the exponential distribution param set lambda 30.0 set mu     33.0
#creation of nodes set n1 [$ns node] set n2 [$ns node] #The queue limit is 1Lakh as the capacity is infin…

Installing NS-2.35 in Fedora 17

  1. Download NS2.35 from this link. http://sourceforge.net/projects/nsnam/files/allinone/ns-allinone-2.35/ns-allinone-2.35.tar.gz/download
  2. Copy the file to /home/yourhome (in my case it is, /home/pradeep/)
  3. Untar it using “tar zxvf ns-allione-2.35.tar.gz” (without quotes)
  4. “cd ns-allione-2.35/” (without quotes)
  5. “./install” (see the dot in the beginning)
  6. During the installation there may be a error in linkstate/ls.h, the location of ls.h is  “/home/pradeep/ns-allinone-2.35/ns-2.35/linkstate/ls.h”
  7. Open the file using gedit “gedit /home/pradeep/ns-allinone-2.35/ns-2.35/linkstate/ls.h”
  8. in line number 127, there will be a erase function, change it to this->erase and go to step 5.
  9. Once installation over, set the PATH and that’s it.

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