Queuing Models in NS2

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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 NS2 in Ubuntu 8.04 8.10 and 9.04

Step 1: Download NS2 from the following Website, I tried version ns-allinone-2.33.tar.gz.

Step 2: Put the file under /home/pradeep/ (my user login is pradeep, you may try with your username)

Step 3: go the folder in the shell prompt by issuing the following command cd /home/pradeep/

Step 4: Since installation of NS2 simulator needs some autoconfiguration files which will need to be installed. To download those packages, just execute the following commands $ sudo apt-get install build-essential autoconf automake libxmu-dev

it will take some time to download and install.

Step 5: Now execute the following steps so that NS2 will be installed

    tar zxvf ns-allinone-2.33.tar.gz 
    cd ns-allinone-2.33
    ./install

After the above three steps, NS2 will give the path information which needs to be set in the PATH variable

Step 6: Open the file .bashrc which is available under the folder /home/pradeep/ (if you try to install in root user /root/.bashrc). Use the following command to open the .bashrc file $ gedit /home/pradeep/.bashrc

Step 7: edit the above file and set the following paths over there

export PATH=$PATH:/home/pradeep/ns-allinone-2.33/bin:/home/pradeep/ns-allinone-2.33/tcl8.4.18/unix:/home/pradeep/ns-allinone-2.33/tk8.4.18/unix

export LD_LIBRARY_PATH= /home/pradeep/ns-allinone-2.33/otcl-1.13, /home/pradeep/ns-allinone-2.33/lib

Step 8: Thats it!!! save the file, logout and login with the username.

Step 9: open the shell prompt and type $ ns (you will get a % indicating that the installation is working correctly) $ nam ( a window will be opened showing the network animator)

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