Network Simulator Master Thesis in United Arab Emirates
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Simulator Master Thesis in United Arab Emirates
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About Ns2 Programming
Ns2 is the most popular simulator used to mimic network behavior as network topology creation and log events.
Ns2 Programming Languages
- C++ as a backend (to regulate functionality of protocols and creation of new protocol)
- TCL as a frontend (Network configuration)
Major NS2 commands
Step 1: Command to start network simulation
Syntax:
$ns Run
Step 2: Command to start network simulation using NS2 command
Syntax:
Set ns [new simulator]
Above mentioned syntax is the top line in TCL script. First declare “ns” variable by Set command
Step 3: Command for create and open trace file (Trace file is used to store simulation data which is used to output)
Syntax:
Set tracefile1 [open out.tr w]
$ns trace-all $tracefile1
“tracefile1”: It is a file handler and called by its pointer (to handle trace file)
“Open out.tr”: open trace file
“W”: Write command (write in trace file)
Step 4: Command for create and open NAM files (Display complete result)
Syntax:
Set namfile [open out.nam w]
$ns nametrace-all $namfile
“namfile”: It is called by its pointer
Step 5: Command to create node in Network Simulator 2
Syntax:
Set n1 [$ns node]
Step 6: Command to create variable in Network Simulator 2
Syntax:
Set MyRng1 [new RNG] //Random variable creation
$MyRng2 seed2
There are several distributions used to create random variables such as constand, pareto, uniform and exponential in NS2.
Step 7: Final command for program termination
Syntax:
Finish
Example:
// Procedure for “finish”
Proc finish {}
{
global ns namfile tracefile1
$ns flush-trace
//Command for close Namfile
Close $ namfile
//Command for close trace file
Close $tracefile1
//Command for close nam file
close namfil
// NAM execution process on trace file
exec open out.nam &
exit 0
}
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