PART A SIMULATION EXERCISES

Transcription

1 PART A SIMULATION EXERCISES 1. Simulate a three nodes point to point network with duplex links between them. Set the queue size and vary the bandwidth and find the number of packets dropped. set ns [ new Simulator ] set trf [ open 1.tr w ] trace-all $trf set namf [ open 1.nam w ] namtrace-all $namf # The below code is used to create the nodes. set n0 [ node] set n1 [ node] set n2 [ node] #This is used to give color to the flow of packets. color 1 "red" color 2 "green" $n0 label "Source/udp0" $n1 label "Source/udp1" $n2 label destination #providing the link duplex-link $n0 duplex-link $n1 $n2 10Kb 100ms DropTail $n2 5Mb 200ms DropTail # set the queue size b/w the nodes set queue-limit $n0 $n2 10 set cbr1 [new Application/Traffic/CBR] $cbr1 attach-agent $udp1 #The below code sets the udp0 packets to red and udp1 packets to blue color $udp0 set class_ 1 $udp1 set class_ 2 #The below code is used to connect the agents. connect $udp0 $null3 VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 1 of 17

2 connect $udp1 $null3 #The below code is used to set the packet size to 500 $cbr1 set packetsize_ 500Mb #The below code is used to set the interval of the packets, $cbr1 set interval_ proc finish { { global ns namf trf flush-trace exec nam 1.nam & close $trf close $namf exit 0 at 0.1 "$cbr0 start" at 0.1 "$cbr1 start" at 10.0 "finish" run VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 2 of 17

3 2. Simulate a four node point-to-point network with the links connected as follows: n0-n2, nl-n2 and n2-n3. Apply TCP agent between no-n3 and UDP between nl-n3. Apply relevant applications over TCP and UDP agents changing the parameter and determine the number of packets sent by TCP/UDP. set ns [new Simulator] set trf [open 2.tr w] trace-all $trf set namf [open 2.nam w] namtrace-all $namf #to create nodes set n0 [ node] set n1 [ node] set n2 [ node] set n3 [ node] # The below code is used to set the color and name's to the #nodes. color 1 "red" color 2 "green" $n0 label "source1" $n1 label "source2" $n2 label "Router" $n3 label "destination" duplex-link $n0 duplex-link $n1 duplex-link $n2 $n2 10Mb 10ms DropTail $n2 10Kb 100ms DropTail $n3 100Mb 1ms DropTail # The below code is used assign TCP and UDP agents and traffic set tcp0 [new Agent/TCP] attach-agent $n0 $tcp0 set ftp0 [new Application/FTP] $ftp0 attach-agent $tcp0 set sink3 [new Agent/TCPSink] attach-agent $n3 $sink3 set udp1 [new Agent/UDP] attach-agent $n1 $udp1 set nul3 [new Agent/Null] attach-agent $n3 $nul3 #The below code is used to set the packet size of ftp and #udp. VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 3 of 17

4 $ftp0 set packetsize_ 200 $ftp0 set interval_ 0.01 $cbr1 set packetsize_ 300 $cbr1 set interval_ #This code is used give color for links $tcp0 set class_ 1 $udp1 set class_ 2 #connect the agents connect $tcp0 connect $udp1 $sink3 $nul3 proc finish { { global ns naf trf flush-trace exec nam 2.nam & close $naf close $trf exit 0 at 0.1 "$cbr1 start" at 0.3 "$ftp0 start" at 10.0 "finish" run VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 4 of 17

5 3. Simulate the different types of Internet traffic such as FTP and TELNET over a network and analyze the throughput. set ns [new Simulator] set trf [open 3.tr w] trace-all $trf set naf [open 3.nam w] namtrace-all $naf set n0 [ node] set n1 [ node] set n2 [ node] set n3 [ node] $n0 label "Source/FTP" $n1 label "Source/Telnet" $n3 label "Destination/FTP/Telnet" color 1 "red" color 2 "green" duplex-link $n0 $n2 5Mb 10ms DropTail duplex-link $n1 $n2 10Mb 10ms DropTail duplex-link $n2 $n3 15Mb 10ms DropTail set tcp0 [new Agent/TCP] attach-agent $n0 $tcp0 set ftp0 [new Application/FTP] $ftp0 attach-agent $tcp0 set sink3 [new Agent/TCPSink] attach-agent $n3 $sink3 set tcp1 [new Agent/TCP] attach-agent $n1 $tcp1 set telnet1 [new Application/Telnet] $telnet1 attach-agent $tcp1 set sink3 [new Agent/TCPSink] attach-agent $n3 $sink3 $telnet1 set packetsize_ 500Mb $telnet1 set interval_ #The below code is used to connect the tcp agents & sink. connect $tcp0 $sink3 connect $tcp1 $sink3 #The below code is used to assign color to packets. $tcp0 set class_ 1 VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 5 of 17

6 $tcp1 set class_ 2 proc finish { { global ns naf trf exec nam 3.nam & close $naf close $trf exit 0 at 0.3 "$ftp0 start" at 0.3 "$telnet1 start" at 10 "finish" run VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 6 of 17

7 4. Simulate the transmission of ping messages over a network topology consisting of 6 nodes and find the number of packets dropped due to congestion. set ns [new Simulator] set trf [open 4.tr w] trace-all $trf set naf [open 4.nam w] namtrace-all $naf set n0 [ node] set n1 [ node] set n2 [ node] set n3 [ node] set n4 [ node] set n5 [ node] set n6 [ node] $n0 label "Ping0" $n3 label "Ping3" $n4 label "Ping4" $n6 label "Ping6" $n2 label "Router" color 1 "red" color 2 "blue" duplex-link $n0 $n2 10Mb 30ms DoopTal duplex-link $n5 $n2 10Mb 30ms DoopTal duplex-link $n2 $n6 5Mb 50ms DropTail duplex-link $n3 $n2 10Kb 40ms DropTail duplex-link $n1 $n4 100Mb 100ms DropTail # connect the ping agents set ping0 [new Agent/Ping] attach-agent $n0 $ping0 set ping3 [new Agent/Ping] attach-agent $n3 $ping3 set ping4 [new Agent/Ping] attach-agent $n4 $ping4 set ping5 [new Agent/Ping] attach-agent $n6 $ping6 VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 7 of 17

8 $ping0 set packetsize_ 500 $ping0 set interval_ $ping4 set packetsize_ 500 $ping4 set interval_ $ping0 set class_ 1 $ping4 set class_ 2 connect $ping0 connect $ping4 $ping3 $ping5 #The below function is executed when the ping agent receives #a reply from the destination Agent/Ping instproc recv {from rtt { $self instvar node_ puts " The node [$node_ id] received an reply from $from with round trip time of $rtt" proc finish { { global ns naf trf exec nam 4.nam & flush-trace close $trf close $naf exit 0 # to start sending the ping packets at 0.1 "$ping0 send" at 0.2 "$ping0 send" at 0.3 "$ping0 send" at 0.4 "$ping0 send" at 0.5 "$ping0 send" at 0.6 "$ping0 send" at 0.7 "$ping0 send" at 0.8 "$ping0 send" at 0.9 "$ping0 send" at 1.0 "$ping0 send" at 0.1 "$ping4 send" at 0.2 "$ping4 send" at 0.3 "$ping4 send" at 0.4 "$ping4 send" at 0.5 "$ping4 send" at 0.6 "$ping4 send" at 0.7 "$ping4 send" VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 8 of 17

9 at 0.8 "$ping4 send" at 0.9 "$ping4 send" at 1.0 "$ping4 send" at 6.0 "finish" run VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 9 of 17

10 5. Simulate an Ethernet LAN using n nodes (6-10), change error rate and data rate and compare throughput. set ns [new Simulator] set trf [open 5.tr w] trace-all $trf set naf [open 5.nam w] namtrace-all $naf set n0 [ node] set n1 [ node] set n2 [ node] set n3 [ node] set n4 [ node] set n5 [ node] set n6 [ node] $n1 label "Source" $n2 label "Error Node" $n5 label "Destination" #The below code is used to create a two Lans (Lan1 and #Lan2). make-lan "$n0 $n1 $n2 $n3" 10Mb 10ms LL Queue/DropTail Mac/802_3 make-lan "$n4 $n5 $n6" 10Mb 10ms LL Queue/DropTail Mac/802_3 # connect node n2 and n6 duplex-link $n2 $n6 10Mb 100ms DropTail set udp0 [new Agent/UDP] attach-agent $n1 $udp0 set cbr0 [ new Application/Traffic/CBR] $cbr0 attach-agent $udp0 set null5 [new Agent/Null] attach-agent $n5 $null5 connect $udp0 $null5 $cbr0 set packetsize_ 100 $cbr0 set interval_ $udp0 set class_ 1 # The below code is used to add an error model between the nodes n2 and n6. set err [new ErrorModel] lossmodel $err $n2 $n6 #inserting the error rate VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 10 of 17

11 $err set rate_ 0.1 proc finish { { global nf ns tf exec nam 5.nam & close $naf close $trf exit 0 at 6.0 "finish" at 0.1 "$cbr0 start" run VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 11 of 17

12 6. Simulate an Ethernet LAN using n nodes and set multiple traffic nodes and determine collision across different nodes. set ns [new Simulator] set trf [open 6.tr w] trace-all $trf set naf [open 6.nam w] namtrace-all $naf #to create nodes set n0 [ node] set n1 [ node] set n2 [ node] set n3 [ node] set n4 [ node] set n5 [ node] make-lan -trace on "$n0 $n1 $n2 $n3 $n4 $n5 10Mb 100ms Queue/DropTail Mac/802_3 set tcp0 [new Agent/TCP] attach-agent $n0 $tcp0 set ftp0 [new Application/FTP] $ftp0 attach-agent $tcp0 set sink2 [new Agent/TCPSink] attach-agent $n2 $sink2 connect $tcp0 $sink2 set udp1 [new Agent/UDP] attach-agent $n4 $udp1 set cbr1 [new Application/Traffic/CBR] $cbr1 attach-agent $udp1 set null [new Agent/Null] attach-agent $n5 $null connect $udp1 $null set tcp1 [new Agent/TCP] attach-agent $n1 $tcp1 set ftp1 [new Application/FTP] $ftp1 attach-agent $tcp1 set sink3 [new Agent/Null] attach-agent $n3 $sink3 connect $tcp1 $sink3 $ftp0 set interval_ $cbr1 set interval_ $ftp1 set interval_ VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 12 of 17

13 proc finish { { global ns naf trf flush-trace exec nam 6.nam & close $trf close $naf exit 0 at 0.1 "$cbr1 start" at 0.2 "$ftp1 start" at 0.3 "$ftp0 start" at 6.0 "finish" run VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 13 of 17

14 7. Simulate an Ethernet LAN using n nodes and set multiple traffic nodes and plot congestion window for different source and destination. set ns [new Simulator] set trf [open 7.tr w] trace-all $trf set naf [open 7.nam w] namtrace-all $naf set n0 [ node] set n1 [ node] set n2 [ node] set n3 [ node] set n4 [ node] make-lan "$n0 $n1 $n2 $n3 $n4" 10mb 10ms LL Queue/DropTail Mac/802_3 set tcp0 [new Agent/TCP] attach-agent $n0 $tcp0 set ftp0 [new Application/FTP] $ftp0 attach-agent $tcp0 set sink2 [new Agent/TCPSink] attach-agent $n2 $sink2 connect $tcp0 $sink2 set tcp3 [new Agent/TCP] attach-agent $n3 $tcp3 set ftp3 [new Application/FTP] $ftp3 attach-agent $tcp3 set sink3 [new Agent/TCPSink] attach-agent $n4 $sink3 connect $tcp3 $sink3 #To build the congestion window set f1 [open f1.tr w] $tcp0 attach $f1 $tcp0 trace cwnd_ set f2 [open f2.tr w] $tcp3 attach $f2 $tcp3 trace cwnd_ VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 14 of 17

15 proc finish { { global naf trf ns flush-trace exec nam 7.nam & close $naf close $trf exit 0 at 0.1 "$ftp0 start" at 1.5 "$ftp0 stop" at 2 "$ftp0 start" at 3 "$ftp0 stop" at 0.2 "$ftp3 start" at 2 "$ftp3 stop" at 2.0 "$ftp0 start" at 4.0 "$ftp3 stop" at 10.0 "finish" run VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 15 of 17

16 8. Simulate simple ESS and with transmitting nodes in wire-less LAN by simulation and determine the performance with respect to transmission of packets. set ns [new Simulator] set trf [open 8.tr w] trace-all $trf set topo [new Topography] $topo load_flatgrid set naf [open 8.nam w] #to specify the node topology namtrace-all-wireless $naf node-config -adhocrouting DSDV \ -lltype LL \ -mactype Mac/802_11 \ -ifqtype Queue/DropTail \ -ifqlen 20 \ -phytype Phy/WirelessPhy \ -channeltype Channel/WirelessChannel \ -proptype Propagation/TwoRayGround \ -anttype Antenna/OmniAntenna \ -topoinstance $topo \ -agenttrace ON \ -routertrace ON create-god 3 set n0 [ node] set n1 [ node] set n2 [ node] set n3 [ node] $n0 label "tcp0" $n1 label "sink1/tcp1" $n2 label "tcp1 $n3 label $sink2/tcp2" #The below code is used to give the initial node positions. $n0 set X_ 70 $n0 set Y_ 70 $n0 set Z_ 0 $n1 set X_ 120 $n1 set Y_ 120 $n1 set Z_ 0 VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 16 of 17

17 $n2 set X_ 500 $n2 set Y_ 500 $n2 set Z_ 0 at 0.3 "$n0 setdest at 0.3 "$n1 setdest " at 0.3 "$n2 setdest " set tcp0 [new Agent/TCP] attach-agent $n0 $tcp0 set ftp0 [new Application/FTP] $ftp0 attach-agent $tcp0 set sink1 [new Agent/TCPSink] attach-agent $n1 $sink1 connect $tcp0 $sink1 set tcp1 [new Agent/TCP] attach-agent $n2 $tcp1 set ftp1 [new Application/FTP] $ftp1 attach-agent $tcp1 set sink2 [new Agent/TCPSink] attach-agent $n3 $sink2 connect $tcp1 $sink2 at 5 "$ftp0 start" at 10 "$ftp1 start" #The below code is used to provide the node movements. at 120 "$n2 setdest " proc finish { { global ns naf trf flush-trace exec nam 8.nam & close $trf close $naf exit 0 at 400 "finish" run VTU NOTES QUESTION PAPERS NEWS RESULTS FORUMS 17 of 17