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$ns duplex-link $host0_if1 $host1_if1 .5Mb 200ms DropTailset sctp0 [new Agent/SCTP]$ns multihome-attach-agent $host0_core $sctp0set trace_ch [open trace.sctp w]$sctp0 set trace_all_ 1$sctp0 trace rto_$sctp0 trace errorCount_$sctp0 attach $trace_ch;# print all on a single trace eventset sctp1 [new Agent/SCTP]$ns multihome-attach-agent $host1_core $sctp1$ns connect $sctp0 $sctp1set ftp0 [new Application/FTP]$ftp0 attach-agent $sctp0$sctp0 set-primary-destination $host1_if0;# set primary before association starts$ns at 7.5 "$sctp0 set-primary-destination $host1_if1";# change primary$ns at 7.5 "$sctp0 print cwnd_" ;# print all dests’ cwnds at time 7.5$ns at 0.5 "$ftp0 start"$ns at 9.5 "$ftp0 stop"$ns at 10.0 "finish"$ns run307
Chapter 36Agent/SRMThis chapter describes the internals of the SRM implementation in ns. The chapter is in three parts: the first part is an overviewof a minimal SRM configuration, and a “complete” description of the configuration parameters of the base SRM agent. Thesecond part describes the architecture, internals, and the code path of the base SRM agent. The last part of the chapter is adescription of the extensions for other types of SRM agents that have been attempted to date.The procedures and functions described in this chapter can be found in ~ns/tcl/mcast/srm.tcl, ~ns/tcl/mcast/srm-adaptive.tcl,~ns/tcl/mcast/srm-nam.tcl, ~ns/tcl/mcast/srm-debug.tcl, and ~ns/srm.{cc, h}.36.1 ConfigurationRunning an SRM simulation requires creating and configuring the agent, attaching an application-level data source (a trafficgenerator), and starting the agent and the traffic generator.36.1.1 Trivial ConfigurationCreating the Agentset ns [new Simulator]$ns enableMcastset node [$ns node]set group [$ns allocaddr];# preamble initialization;# agent to reside on this node;# multicast group for this agentset srm [new Agent/SRM]$srm set dst_ $group ;# configure the SRM agent$ns attach-agent $node $srm$srm set fid_ 1$srm log [open srmStats.tr w]$srm trace [open srmEvents.tr w];# optional configuration;# log statistics in this file;# trace events for this agentThe key steps in configuring a virgin SRM agent are to assign its multicast group, and attach it to a node.308
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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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Page 265 and 266: Dense Mode The Dense Mode protocol
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Page 271 and 272: CtrMcastComp is the centralised mul
Page 273 and 274: $ns_ mrtproto This command specifi
Page 275 and 276: Chapter 31Network DynamicsThis chap
Page 277 and 278: v 0.8123 link-up 3 5v 0.8123 link-u
Page 279 and 280: The first argument is the time at w
Page 281 and 282: $ns_ rtmodel This command defines
Page 283 and 284: $ns set-address-format hierarchical
Page 285 and 286: 32.4 Hierarchical Routing with Sess
Page 287 and 288: Chapter 33UDP Agents33.1 UDP Agents
Page 289 and 290: Chapter 34TCP AgentsThis section de
Page 291 and 292: set ns [new Simulator]set node1 [$n
Page 293 and 294: 34.2.1 The Base TCP SinkThe base TC
Page 295 and 296: Agent/TCP/FullTcp set dupseg_fix_ t
Page 297 and 298: 34.5 Tracing TCP DynamicsThe behavi
Page 299 and 300: Chapter 35SCTP AgentsThis chapter d
Page 301 and 302: Figure 35.1: Example of a Multihome
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Page 317 and 318: 36.4 Loss Detection—The Class SRM
Page 319 and 320: same packet. The repair objet does
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Page 325 and 326: #set up the multicast routingDM set
Page 327 and 328: 37.3 Architecture of the PLM Protoc
Page 329 and 330: We add in void PLMLossMonitor::recv
Page 331 and 332: Part VIApplication330
Page 333 and 334: Traffic generatorsApplication/Traff
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Page 351 and 352: PagePool/ProxyTrace takes these two
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Object Type Event Type Explaination
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Chapter 40Worm ModelIn this chapter
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$w local-p 0.5Following are some co
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(nsnode) clientcloudPackM ime(nsnod
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HTTP responsesclients servers Delay
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41.5 Commands at a GlanceThe follow
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• HTTP response size (bytes)• s
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Chapter 42Session-level Packet Dist
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42.1.2 Inserting a Loss ModuleWhen
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Delay and Loss Modules Each receive
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Chapter 43Asim: approximate analyti
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set n(1) [$ns node]set link(0:1) [$
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Part VIIIEmulation382
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When using the emulation mode, a sp
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set intf [$pf1 open readonly]puts "
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puts "install nets into taps..."$a0
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Chapter 45Nam45.1 IntroductionNam i
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• Button 6 (Chevron logo) - Close
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Second, when dealing with randomly
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dst_portaddr,seqno,flags,sname);A n
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• up• down• right• left•
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46.1.7 Agent TracingAgent trace eve
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v -t 1.0 -e node_tclscript 2 "Echo
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If nam ever gets to the end of an e
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l :link-t time-s source id-d des
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E :D :P :a :session enqueue-t time
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v :V :N :W :g :A :c :q :execute tcl
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$ns duplex-link-op orient right$ns
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Chapter 47Educational use of NS and
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Bibliography[1] C. Alaettinoğlu, A
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