Re: [ns] your help needed

[Xuan Chen <xuanc@ISI.EDU>]

You probably want to try nam editor to create the topology and show the 
animation with nam. Please refer to ns manual for details. You may 
also find some of the samples scripts under ~ns/tcl/ex helpful.

Cheers,
-chen

On Fri, 4 Jan 2002, Nicolas Karim wrote:

> 
> Dear Sir;
> 
> As I am doing my final year project I was asked to do a model of one of
> our existing networking site of our University, can you pls help me
> showing me how to get started, to do develop the Network simulation /
> Network animation tools by providing the code (C language) so i can amend
> it in a way suitable to the model ...
> 
> So far I have prepared the following (attached) code can you please amed
> it in a way that I can run it in my Solaris (UNIX) of my UNi to
> demonstrate it to my supervisor...
> 
> The network is composed of the following:
> 
> - 7 mini hubs
> 
> -7 switches
> 
> - 100 terminals
> 
> ///////////////////////////////////////////////////////////////////////////////
> ////////////////////////////////////////////////////
> 
> #Declaration of new simulation
> set ns [new Simulator]
> 
> #Declaration that contain the result
> set ftrace [open ftp1.tr w]
> set nf [open tp1.nam w]
> $ns namtrace-all $nf
> 
> #Procedure launched at the end of the simulation
> proc finish {} {
> �global ns ftrace nf
> �$ns flush-trace
> �close $nf
> �close $ftrace
> �exit 0
> }
> 
> #Procedure that recover the size of window's congestion that transmit the
> time function
> proc traceWindow {} {
> global tcp0 ftrace
> set ns [Simulator instance]
> set time 0.01
> set now [$ns now]
> puts $ftrace "$now [$tcp0 set cwnd_]"
> $ns at [expr $now+$time] "traceWindow"
> }
> 
> �
> 
> #Declaration of characteristiques of TCP agent
> Agent/TCP set packetSize_ �1500
> Agent/TCP set maxcwnd_��30
> Agent/TCPSink/DelAck� set interval_�0.00001
> 
> 
> #Declaration of the nodes
> set n0 [$ns node]
> 
> #### we need to declare the other nodes in here
> 
> 
> #Declaration of TCP agents and ftp application of n0 (source)
> set tcp0 [new Agent/TCP]
> $ns attach-agent $n0 $tcp0
> set ftp [new Source/FTP]
> $ftp set agent_ $tcp0
> ��
> #Declaration of TCP agent of n4 (sources)
> set tcp1 [new Agent/TCPSink/DelAck]
> $ns attach-agent $n4 $tcp1
> 
> 
> #Declaration of links between nodes
> $ns duplex-link $n0 $n2 10Mb 10ms DropTail
> 
> ####We need to declare the other links in here as before
> 
> 
> #The Attachement of TCP agents of the nodes n0 and n4
> $ns connect $tcp0 $tcp1
> 
> 
> #Time of events
> $ns at 0.8 "finish"
> $ns at 0.0 "$ftp start"
> $ns at 0.0 "traceWindow"
> ###The applicable FTP layer from the attached source n0
> set ftp [new Application/FTP]
> $ftp set agent_ $tcp0
> 
> ### we can run it by typing ns tp1.tcl
> ### the file tp1.nam will be generated by ns; to open it with NAM type
> ### nam tp1.nam
> ### to see the graph congestion open "ftp1.tr" with "gnuplot"
> #Finally, start the simulation
> $ns run
> 
> ///////////////////////////////////////////////////////////////////////////////
> //////////////////////
> 
> ### Dynamic Routage
> set ns [new Simulator]
> set nf [open tp2.nam w]
> $ns namtrace-all $nf proc finish {} {�global ns ftrace nf�
> $ns flush-trace�close
> $nf�exit 0 }
> #Colors Definition
> $ns color 2 black
> $ns color 1 blue
> $ns color 0 purple
> $ns color 30 yellow
> $ns color 31 red
> #The TCP traffic is in red
> $tcp set class_ 31
> #### Dynamique Routage Mode
> $ns rtproto DV
> #----------------- For You ! ---------------------
> #### We Can Define the nodes & the links in here
> #### We define the TCP Agents & The FTP Application in here
> #### We need to connect the TCP Agents in here
> #------------------------------------------------
> #### Link between n0 & n1� would fail between 1.0 et 1.2 seconds
> $ns rtmodel-at 1.0 down
> $n1
> $n2
> $ns rtmodel-at 1.2 up
> $n1
> $n2
> $ns at 0.1 "$ftp start"
> $ns at 1.6 "finish"
> $ns run
> 
> ///////////////////////////////////////////////////////////////////////////////
> ////////////////////////////////////////////////////
> 
> Many Thanks
> 
> Nicolas krim
> 
> krimn@hotmail.com
> 
> 
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> 

-- 
Xuan Chen
USC/ISI