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$tcp set window_ For all possible configuration parameters available for TCP see section 34.1.4. The default configuration values can also befound in ns/tcl/lib/ns-default.tcl.Following is an example of a simple TCP connection setup:set tcp [new Agent/TCP]$ns_ attach-agent $node_(s1) $tcp$tcp set fid_ 0set ftp [new Application/FTP]$ftp attach-agent $tcpset sink [new Agent/TCPSink]$ns_ attach-agent $node_(k1) $sink$sink set fid_ 0$ns_ connect $ftp $sink$ns_ at $start-time "$ftp start";# create tcp agent;# bind src to node;# set flow ID field;# create ftp traffic;# bind ftp traffic to tcp agent;# create tcpsink agent;# bind sink to node;# set flow ID field;# active connection src to sink;# start ftp flowFor an example of setting up a full-tcp connection see section 34.3.1.297
Chapter 35SCTP AgentsThis chapter describes the SCTP agents developed for ns by the Protocol Engineering Lab at the University of Delaware.The SCTP agents are all two-way agents, which means they are symmetric in the sense that they represent both a sender andreceiver. However, bi-directional data has not yet been implemented. Each instance of an SCTP agent is either a sender orreceiver.The SCTP agents are implemented in files matching the regular expression ~ns/sctp/sctp*.{cc, h}.The SCTP agents currently supported are:• Agent/SCTP - RFC2960 + draft-ietf-tsvwg-sctpimpguide-09.txt + draft-ietf-tsvwg-usctp-01.txt• Agent/SCTP/HbAfterRto - experimental extension (HEARTBEAT after RTO)• Agent/SCTP/MultipleFastRtx - experimental extension (UD PEL’s Multiple Fast Retransmit algorithm)• Agent/SCTP/Timestamp - experimental extension (TIMESTAMP chunk)• Agent/SCTP/MfrHbAfterRto - experimental extension that combines MultipleFastRtx and HbAfterRto• Agent/SCTP/MfrTimestamp - experimental extension that combines MultipleFastRtx and TimestampSection 35.1 provides a simple overview of the base SCTP agent with details of configuration parameters and commands.Section 35.2 describes the SCTP extensions available. The details of the SCTP trace format used in packet trace files areexplained in Section 35.3. Section 35.4 explains how to use legacy applications with SCTP and how to write SCTP-aware applicationswhich exploit all SCTP’s features. Section 35.5 provides examples scripts for both singled homed and multihomedendpoints.35.1 The Base SCTP AgentThe base SCTP agent Agent/SCTP supports the features in the following sections of RFC2960, including modifications upto draft-ietf-tsvwg-sctpimpguide-13.txt.5.1 Normal Establishment of an Association (rudimentary handshake)6.1 Transmission of DATA Chunks298
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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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Page 251 and 252: Chapter 29Unicast RoutingThis secti
Page 253 and 254: Asymmetric Routing Asymmetric routi
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Page 259 and 260: Global Actions Once the detailed ac
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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
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Page 281 and 282: $ns_ rtmodel This command defines
Page 283 and 284: $ns set-address-format hierarchical
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Page 291 and 292: set ns [new Simulator]set node1 [$n
Page 293 and 294: 34.2.1 The Base TCP SinkThe base TC
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Page 301 and 302: Figure 35.1: Example of a Multihome
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Page 307 and 308: $ns at 5.0 "finish"$ns run35.5.2 Mu
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Page 333 and 334: Traffic generatorsApplication/Traff
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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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$w local-p 0.5Following are some co
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(nsnode) clientcloudPackM ime(nsnod
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HTTP responsesclients servers Delay
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41.5 Commands at a GlanceThe follow
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• HTTP response size (bytes)• s
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Chapter 42Session-level Packet Dist
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42.1.2 Inserting a Loss ModuleWhen
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Delay and Loss Modules Each receive
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Chapter 43Asim: approximate analyti
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set n(1) [$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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