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…

Network Simulator 2 installation in Fedora 17 (Beta)

Hope you would have tried installing NS2 in Fedora 16. Now here is a new post that you can install ns2.35 in Fedora 17 beta.

  1. Install Fedora 17 beta from a DVD and install all the softwares that are coming along with the DVD (Except the Languages). There will be a "Customize now" option will be there during the installation of Fedora, check that and install all the required softwares.
  2. Download NS-23.5 from http://www.isi.edu/nsnam/ns/
  3. Untar the downloaded ns-allinone-xxx.tar.gz file using the command “tar zxvf ns-allinone-2.35.tar.gz”
  4. execute the commands one by one as given below

cd ns-allinone-2.35

./install

(you may get an error called ~ns-2.35/linkstate/ls.h error in line number 137, 

change the following line to 

                            void eraseAll() { erase(baseMap::begin(), baseMap::end()); }

to this line

                            void eraseAll() { this->erase(baseMap::begin(), baseMap::end()); }

and again give

./install

(You get the PATH information if the installation was successful, upon succeeding set the PATH in the relevant file .bash_profile)

Type ns and see a  % symbol indicates that the installation of ns2 is successful and also try the command  nam so that a network animator will be opened.

For any doubts, please raise a comment in the following column. I am there to help you. 

 

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