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…

NS2.34 installation in Fedora 14

To install Network Simulator Version 2.34 in Fedora 14 has the following limitations.

1. Fedora 14 comes with GCC version 3.5 which has major changes like it accept X() rather than X::X(), So ns also has to modify accordingly.

2. You may get an error for GammaRandomVariable, so that has to be corrected in the following two files

~ns-allinone-2.34/ns-2.34/mobile/nakagami.cc  and

~ns-allinone-2.34/ns-2.34/tools/ranvar.cc

02

(Above pic: The file nakagami.cc has to be opened and there will a change in two line numbers 183 and 185 as given below)

03

(The file ranvar.cc has to be opened and change in line number 219 as given below)

04

05

Once the above steps done,

Go to terminal and install NS2 (http://pradeepkumar.org/2008/11/installation-instructions-for-network.html)

and refer the video for installing NS2. http://pradeepkumar.org/2011/02/installation-of-network-simulator-2-ns2video.html

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