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SEARCH/VIEW/DOWNLOAD NS SCRIPTS: You could search the database using keywords by going to the “Searchdatabase” page. You could also browse through the entire database by going to the “View database” page. The searchfunction is very basic at the present and we hope to extend it as the database begins to grow in size. Each script entryin the database has the following information:Name of the scriptName of the author, author’s email-id and webpage(if provided)Description of what the simulation does.nsversion required to run the scriptAny other comments about script andThe category of the script Currently we have categories of Application, Transport (TCP and others), Routing (unicastand multicast), Multicast protocols, Queue management, Wireless and Others (to include any other category).Other related files At the right hand down corner of each entry there might be links to a NamTracefile, a screenshotand a webpage for the simulation script, if these files/information have been submitted by the author along withthe script.In order to download any script or any of the related files, simply left-click on the filename and a download dialog boxwill appear where you can provide the path to download the file to.SUBMIT NS SCRIPTS TO INVENTORY: Incase you have simulation scripts suitable for classroom demonstrations, youcould submit them to the inventory. You have to ATLEAST submit the following in order to successfully upload yourscript:Name of authorAuthor’s E-mailidName of script (and path to the location of your script) to contributeBrief description of scriptVersion of NS script usesCategory for the scriptYou may OPTIONALLY provide the following along with the above required fields:Author’s WebPageNamtrace file (namdump for your script simulation)Screenshot (an image of your nam screen)Webpage (pointer to webpage you may have for the script)Other comments, if anyImportant: We suggest that you provide the namtracefile alongwith your script since many users might want to use thenamtrace only, for visualization, and download script only when they want to make any changes to the simulation.47.2 Using NAM for educational purposesInorder to visualize an ns simulation, you need to have the NAM tool installed. You could either simply download the nambinary for your platform or download the nam distribution and build in your machine. The link for getting nam binaries aswell as nam source is http://www.isi.edu/nsnam/nam which also happens to be the nam homepage.Steps to use nam in powerpoint: After opening powerpoint, go to “Slide Show” (visible on the top menu) and click on “actionbuttons”. Select the type of button you prefer. This would create a button for your slide. Clicking on your button will popup an “Action Setting" window. Inside the window, there is a place called “Run Program” where you can define your namprogram to run.415
Bibliography[1] C. Alaettinoğlu, A.U. Shankar, K. Dussa-Zeiger, and I. Matta. Design and implementation of MaRS: A routing testbed.Internetworking: Research and Experience, 5:17–41, 1994.[2] Sandeep Bajaj, Lee Breslau, Deborah Estrin, Kevin Fall, Sally Floyd, Padma Haldar, Mark Handley, Ahmed Helmy,John Heidemann, Polly Huang, Satish Kumar, Steven McCanne, Reza Rejaie, Puneet Sharma, Kannan Varadhan, Ya Xu,Haobo Yu, and Daniel Zappala. Improving simulation for network research. Technical Report 99-702b, University ofSouthern California, March 1999. (revised September 1999).[3] Paul Barford and Mark Crovella. Generating representative web workloads for network and server peformance evaluation.In Proceedings of the ACM SIGMETRICS, pages 151–160, June 1998.[4] L.S. Brakmo, S. O’Malley, and L.L. Peterson. TCP vegas: New techniques for congestion detection and avoidance. InProceedings of the ACM SIGCOMM, pages 24–35, October 1994.[5] L.S. Brakmo, S. O’Malley, and L.L. Peterson. TCP vegas: New techniques for congestion detection and avoidance.Technical Report TR 94 04, Department of Computer Science, The University of Arizona, Tucson, AZ 85721, February1994.[6] R. Brown. Calendar queues: A fast O(1) priority queue implementation for the simulation event set problem. Communicationsof the ACM, 31(10):1220–1227, October 1988.[7] Pei Cao and Chengjie Liu. Maintaining strong cache consistency in the World-Wide Web. In Proceedings of the IEEEICDCS, pages 12–21, May 1997.[8] N. Christin, J. Liebeherr, and T. Abdelzaher. A quantitative assured forwarding service. In Proceedings of IEEEINFOCOM 2002, volume 2, pages 864–873, New York, NY, June 2002.[9] S. Deering, D. Estrin, D. Farinacci, V. Jacobson, Ching-Gung Liu, and L. Wei. An architecture for wise-area multicastrouting. Technical Report USC-SC-94-565, Computer Science Department, University of Southern California, LosAngeles, CA 90089., 1994.[10] Anja Feldmann, Anna C. Gilbert, Polly Huang, and Walter Willinger. Dynamics of IP traffic: A study of the role ofvariability and the impact of control. pages 301–313, Cambridge, MA, USA, August 1999.[11] S. Floyd, V. Jacobson, C. Liu, S. McCanne, and L. Zhang. A reliable multicast framework for light-weight sessions andapplication level framing. In Proceedings of the ACM SIGCOMM, pages 342–356, August 1995.[12] H. T. Friis. A note on a simple transmission formula. Proc. IRE, 34, 1946.[13] H. W. Hethcote. The mathematics of infectious diseases. SIAM Review, 42(4):599–653, October 2000.[14] A. Heybey. Netsim Manual. MIT, 1989.[15] R. Jain. The Art of Computer Systems Performance Analysis. John Wiley and Sons, Inc., 1996.[16] Pierre L’Ecuyer. Good parameters and implementations for combined multiple recursive random number generators.Operations Research, 47(1):159–164, 1999.416
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18 Radio Propagation Models 17718.1
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30 Multicast Routing 25130.1 Multic
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38.2.5 An example . . . . . . . . .
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X Other 40347 Educational use of NS
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# so, we lied. now, we define the t
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Chapter 2Undocumented FacilitiesNs
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Part IInterface to the Interpreter1
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• if you can do what you want by
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• tcl.result(const char* s)Pass t
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By convention in ns, the class Agen
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$object set bwvar 1500kb$object set
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For a C++ variable to be traceable,
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3.5 Class TclClassThis compiled cla
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class Packet {......static int hdrl
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The actual arguments passed by the
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class TclClass (Section 3.5) define
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Chapter 4The Class SimulatorThe ove
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4.2.2 the heap schedulerThe heap sc
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4.4 Commands at a glanceSynopsis:ns
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$ns_ dumpqCommand for dumping event
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NODEPortClassifierAgentAgentAddrCla
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The Node instance variable, entry_,
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The default values for all the abov
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The classify() method is pure virtu
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};The class imposes no direct seman
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flow-specific queuing disciplines a
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5.5 Routing Module and Classifier O
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Module NameRtModule/BaseRtModule/Mc
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$node neighborsThis returns the lis
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Linkhead_enqT_queue_ deqT_ link_ tt
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6.2 ConnectorsConnectors, unlink cl
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$ns_ link-lossmodel This function
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Chapter 7Queue Management and Packe
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}}}void Queue::resume(){Packet* p =
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7.3 Different types of Queue object
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maxidle_ is the maximum amount of t
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dst_ The destination address of pac
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7.5.2 ConfigurationRunning a JoBS s
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mean_pkt_size_ Used to set the expe
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Demarker objects$q trace-file This
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The recv() method overrides the bas
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9.2 ImplementationThe procedures an
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Average sending rateTSW window leng
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The following command adds an entry
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$qCE configQ 0 1 10 20 0.10Note tha
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Chapter 10AgentsAgents represent en
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CtrMcast/EncapCtrMcast/DecapMessage
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}bind("windowOption_", &wnd_option_
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hdr_flags* nf = (hdr_flags*)npkt->a
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public:ECHO_Timer(ECHO_Agent *a) :
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10.6.4 Using the agent through OTcl
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State Variables are:dupacks_ Number
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$agent attach-tbf Attaches a token
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(void)Scheduler::instance().schedul
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* outstanding, cancel it.*/void Tcp
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Chapter 12Packet Headers and Format
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method is now obsolete; its usage i
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Packethdrsize_next_bits()points to
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the system’s memory allocator. In
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}incr hdrlen_ $incrreturn $baseFrom
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Chapter 13Error ModelThis chapter d
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SimpleLink::errormodule argsSimulat
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This is a simple example of how to
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Higher LayersNode 1Node 2. . .Node
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};void recv(Packet* p, Handler*);vi
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and the frame type. It then passes
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$ll_ set delay_ $delay$ll_ set band
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14.10 Commands at a glanceThe follo
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15.2.1 Default Hierarchical Setting
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Chapter 16Mobile Networking in nsTh
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entry_addrdemuxIP addressdefaulttar
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16.1.2 Creating Node movementsThe m
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set netif $netif_($t)set mac $mac_(
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the hardware address of a packet’
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destined to itself to the port dmux
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switch(ch->ptype()) {case PT_MAC:br
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16.1.7 Revised format for wireless
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Packet info at "Application level"
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The main problem facing the wired-c
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target_target_encapsulatorreg_agent
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why: This avoids header clashes bet
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This command is used to create a Go
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Chapter 17Satellite Networking in n
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in counter-rotating planes (where t
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• Position/Sat/Geo A geostationar
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$ns add-isl $ltype $node1 $node2 $b
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$satrouteobject_ compute_routeswher
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This will add an error model to the
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lh_firstnameobj‘‘name’’ is
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from routing agentto Node->entrySat
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$satnode add-isl This method c
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set prop [new Propagation/FreeSpace
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18.3.2 Using shadowing modelBefore
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Chapter 19Energy Model in nsEnergy
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Chapter 20Directed DiffusionThe dir
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However if we have a large and dens
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yr application in the ns context. T
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value of opt(pre-stop) is usually t
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21.2 Implementation of XCP in NSIn
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the persistent queue length in the
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Thruput2 0.054024 60000residue_pos_
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Chapter 22DelayBox: Per-Flow Delay
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$ns attach-agent $n_sink $sink# mak
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Chapter 23Changes made to the IEEE
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Part IIISupport214
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endenddocument pargvcPrint out argc
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24.4.2 Memory Conservation TipsSome
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Chapter 25Mathematical SupportThe s
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set run [lindex $argv 0]}if {$run <
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}$sizeRNG next-substream# print the
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protected:RNG* rng_;};Classes deriv
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ns-random is implemented in ~ns/mis
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Chapter 26Trace and Monitoring Supp
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The monitor-queue function is const
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also used to accumulate packet drop
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}name,th->size(),flags,iph->flowid(
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PT_TORA,PT_DSR,PT_AODV,// insert ne
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The QueueMonitor class is not deriv
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$ns_ trace-all This is the command
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Chapter 27Test Suite SupportThe ns
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... ...}$ns_ at $opt(stop).1 "$self
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Example: To enable debugging in Que
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Chapter 29Unicast RoutingThis secti
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Asymmetric Routing Asymmetric routi
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class RouteLogic This class defines
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— The procedure init-all{} is a g
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Global Actions Once the detailed ac
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This dumps next hop information in
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$ns mrtproto ST;# specify shared tr
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Dense Mode The Dense Mode protocol
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and unique label (id). Thus, “inc
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add-iif{ifid link},add-oif{link if}
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CtrMcastComp is the centralised mul
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$ns_ mrtproto This command specifi
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Chapter 31Network DynamicsThis chap
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v 0.8123 link-up 3 5v 0.8123 link-u
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The first argument is the time at w
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$ns_ rtmodel This command defines
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$ns set-address-format hierarchical
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32.4 Hierarchical Routing with Sess
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Chapter 33UDP Agents33.1 UDP Agents
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Chapter 34TCP AgentsThis section de
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set ns [new Simulator]set node1 [$n
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34.2.1 The Base TCP SinkThe base TC
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Agent/TCP/FullTcp set dupseg_fix_ t
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34.5 Tracing TCP DynamicsThe behavi
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Chapter 35SCTP AgentsThis chapter d
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Figure 35.1: Example of a Multihome
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Note: the actual value of these tra
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1.526624 1 4 sctp 1500 -------D 0 1
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$ns at 5.0 "finish"$ns run35.5.2 Mu
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Chapter 36Agent/SRMThis chapter des
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36.1.2 Other Configuration Paramete
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3.6274 n 0 m r 1 type repair servi
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3.6029 n 3 m r 2 Q NTIMER at 3.730
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36.4 Loss Detection—The Class SRM
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same packet. The repair objet does
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}hdr_asrm* seh = (hdr_asrm*) p->acc
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set grp [Node allocaddr]$srm set ds
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#set up the multicast routingDM set
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37.3 Architecture of the PLM Protoc
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We add in void PLMLossMonitor::recv
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Part VIApplication330
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Traffic generatorsApplication/Traff
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• recv(int nbytes)—Announces th
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1. EXPOO_Traffic—generates traffi
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set src [new Agent/UDP]set sink [ne
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Application FTP FTP objects produce
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send_data(ADU)Application(HttpApp,
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39.1.4 Transmitting user data over
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and teardown of connections. Only O
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TclObjectPagePoolPagePool/CompMathP
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PagePool/ProxyTrace takes these two
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}int id_; // object IDWebTrafSessio
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An Http/Server object waits for inc
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set tmp [new RandomVariable/Exponen
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Object Type Event Type Explaination
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Chapter 40Worm ModelIn this chapter
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$w local-p 0.5Following are some co
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Page 367 and 368: HTTP responsesclients servers Delay
Page 369 and 370: 41.5 Commands at a GlanceThe follow
Page 371 and 372: • HTTP response size (bytes)• s
Page 373 and 374: Chapter 42Session-level Packet Dist
Page 375 and 376: 42.1.2 Inserting a Loss ModuleWhen
Page 377 and 378: Delay and Loss Modules Each receive
Page 379 and 380: Chapter 43Asim: approximate analyti
Page 381 and 382: set n(1) [$ns node]set link(0:1) [$
Page 383 and 384: Part VIIIEmulation382
Page 385 and 386: When using the emulation mode, a sp
Page 387 and 388: set intf [$pf1 open readonly]puts "
Page 389 and 390: puts "install nets into taps..."$a0
Page 391 and 392: Chapter 45Nam45.1 IntroductionNam i
Page 393 and 394: • Button 6 (Chevron logo) - Close
Page 395 and 396: Second, when dealing with randomly
Page 397 and 398: dst_portaddr,seqno,flags,sname);A n
Page 399 and 400: • up• down• right• left•
Page 401 and 402: 46.1.7 Agent TracingAgent trace eve
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Page 407 and 408: l :link-t time-s source id-d des
Page 409 and 410: E :D :P :a :session enqueue-t time
Page 411 and 412: v :V :N :W :g :A :c :q :execute tcl
Page 413 and 414: $ns duplex-link-op orient right$ns
Page 415: Chapter 47Educational use of NS and
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