- # The topology replicates the one used by Nirav in his paper
- # no loss added
- #
- set val(chan) Channel/Sat ;#Channel Type
- set val(netif) Phy/Sat ;# network interface type
- set val(mac) Mac/Sat ;# MAC type
- set val(ifq) Queue/DropTail ;# interface queue type
- #set val(ifq) Queue/XCP
- set val(ll) LL/Sat/HDLC ;# link layer type
- set val(err) MarkovErrorModel
- #set val(err) ComplexMarkovErrorModel
- #set val(err) UniformErrorProc
- set val(bw_up) 10Mb
- set val(bw_down) 10Mb
- set val(x) 250
- set val(y) 250
- #Experimrnting with shorted values
- #set durlistA "11.2 0.1"
- set durlistA "11.2 4.0" ;# unblocked and blocked state duration avg value
- set durlistB "27.0 12.0 0.4 0.4" ;# for complexmarkoverror model
- #set BW 10; # in Mb/s
- #set delay 254; # in ms
- # Set the queue length (in packets)
- #set qlen [expr round([expr ($BW / 8.0) * $delay * 2])]; # set buffer to pipe size
- # set sat link bandwidth and delay
- Mac set bandwidth_ 10Mb
- LL set delay_ 125ms
- set val(bdp) [expr 10000/8.0 * 125]
- #set val(bdp) [expr 10000/8.0 * 125 * 0.5]
- #set val(bdp) [expr 10000/8.0 * 125 * 2]
- LL/Sat/HDLC set window_size_ $val(bdp)
- # set selective repeat on; its GoBackN by default
- LL/Sat/HDLC set selRepeat_ 1
- set qlen $val(bdp)
- puts "queue len = $qlen"
- set val(ifqlen) $qlen
- proc start_time {} {return 0; }
- # proc start_time {} {return [expr ([eval ns-random] / 2147483647.0) * 0.1]}
- proc UniformErrorProc {} {
- global val
- set errObj [new ErrorModel]
- $errObj unit bit
- #$errObj FECstrength $val(FECstrength)
- #$errObj datapktsize 512
- #$errObj cntrlpktsize 80
- return $errObj
- }
- proc MarkovErrorModel {} {
- global durlistA newrng_
- #set errmodel [new ErrorModel/TwoStateMarkov $durlistA time]
- set rv0 [new RandomVariable/Exponential]
- set rv1 [new RandomVariable/Exponential]
- $rv0 use-rng $newrng_
- $rv1 use-rng $newrng_
- $rv0 set avg_ [lindex $durlistA 0]
- $rv1 set avg_ [lindex $durlistA 1]
- set errmodel [new ErrorModel/TwoState $rv0 $rv1 time]
- #$errmodel drop-target [new Agent/Null]
- return $errmodel
- }
- proc ComplexMarkovErrorModel {} {
- global durlistB newrng_
- set em [new ErrorModel/ComplexTwoStateMarkov $durlistB time $newrng_]
- $em drop-target [new Agent/Null]
- return $em
- }
- proc stop {} {
- global ns_ tracefd
- $ns_ flush-trace
- close $tracefd
- }
- proc setup {tcptype queuetype sources qlen duration file seed c_sources delay rate ecn} {
- global val traces ns_ tracefd newrng_
- # Initialize Global Variables
- #ns-random $seed
- set ns_ [new Simulator]
- set newrng_ [new RNG]
- $newrng_ seed $seed
- set tracefd [open arq.tr w]
- $ns_ trace-all $tracefd
- $ns_ eventtrace-all
- $ns_ rtproto Static
- # Create sat n(0)
- # configure node, please note the change below.
- $ns_ node-config -satNodeType geo
- -llType $val(ll)
- -ifqType $val(ifq)
- -ifqLen $val(ifqlen)
- -macType $val(mac)
- -phyType $val(netif)
- -channelType $val(chan)
- -downlinkBW $val(bw_down)
- -wiredRouting ON
- set n(0) [$ns_ node]
- $n(0) set-position -95
- $ns_ node-config -satNodeType terminal
- set n(100) [$ns_ node]
- $n(100) set-position 37.9 -122.3; # Berkeley
- set n(101) [$ns_ node]
- $n(101) set-position 42.3 -71.1; # Boston
- # Add GSLs to geo satellites
- $n(100) add-gsl geo $val(ll) $val(ifq) $val(ifqlen) $val(mac) $val(bw_up)
- $val(netif) [$n(0) set downlink_] [$n(0) set uplink_]
- $n(101) add-gsl geo $val(ll) $val(ifq) $val(ifqlen) $val(mac) $val(bw_up)
- $val(netif) [$n(0) set downlink_] [$n(0) set uplink_]
- $n(101) interface-errormodel [$val(err)]
- $ns_ unset satNodeType_
- # create regular routers
- set n(99) [$ns_ node] ;#....node 3
- set n(102) [$ns_ node] ;#....node 4
- # determine the actual queutype and save the one asked for
- # assign queueing parameters -- simulate random drop with RED
- if { [string match RandomDrop* $queuetype ] } then {
- set queuetype [join
- [concat "RED"
- [string range $queuetype [string length "RandomDrop"] end ]]
- "" ]
- Queue/$queuetype set thresh_ [expr 2* $qlen]
- Queue/$queuetype set maxthresh_ [expr 2* $qlen]
- # added for ECN comparison
- Queue/$queuetype set setbit_ $ecn
- } elseif { [string match RED* $queuetype ] } then {
- #added by nirav
- Queue/$queuetype set bytes_ false
- Queue/$queuetype set queue_in_bytes_ false
- # Queue/$queuetype set q_weight_ = -1
- # Queue/$queuetype set max_p = 1
- Queue/$queuetype set gentle_ true
- #added by nirav
- #Queue/$queuetype set thresh_ [expr $qlen * 0.5]
- #Queue/$queuetype set maxthresh_ [expr $qlen * 0.75]
- Queue/$queuetype set thresh_ 0
- Queue/$queuetype set maxthresh_ 0
- # added for ECN comparison
- Queue/$queuetype set setbit_ $ecn
- }
- $ns_ duplex-link $n(99) $n(100) 10Mb 1ms $queuetype
- $ns_ duplex-link $n(101) $n(102) 10Mb 1ms $queuetype
- # Just to shut ns up about the uninitialized cwnd_frac_variable.
- Agent/TCP set cwnd_frac_ 100;
- # window needs to be big for long bw delays - it's a max value for cwnd_
- # initially set at 20 packets.
- #Agent/TCP/Reno set window_ 2000;
- #Agent/TCP/Reno set window_ $val(bdp)
- Agent/$tcptype set window_ $val(bdp)
- # create nodes for sources and c_sources
- puts "sources = $sources"
- puts "c_sources = $c_sources"
- for { set i 1 } {$i <= [expr 2* [expr $sources+$c_sources]]} {incr i} {
- set n($i) [$ns_ node]
- }
- # connect sources and sinks to routers at 100 Mb/s
- for {set i 1} {$i<=$sources} {incr i} {
- $ns_ duplex-link $n($i) $n(99) 100Mb 1ms $queuetype
- $ns_ duplex-link $n(102) $n([expr $i+$sources+$c_sources]) 100Mb 1ms $queuetype
- }
- # connect cross traffic sources and sinks
- for {set i [expr $sources+1]} {$i<= [expr $c_sources+$sources]} {incr i} {
- $ns_ duplex-link $n($i) $n(99) 10Mb 2ms $queuetype
- $ns_ duplex-link $n(100) $n([expr $i+$sources+$c_sources]) 10Mb 2ms $queuetype
- }
- # Setup traffic flow between nodes
- # Create source and sink Agents and connect them
- for {set i 1} {$i<= [expr $sources+$c_sources]} {incr i} {
- # Create the sender agent
- set T($i) [new Agent/$tcptype]
- # If Ecn is on set it in the sender
- if { $ecn } { $T($i) set ecn_ 1 }
- set hstcpflag 0
- if {$hstcpflag==1} {
- puts "creating high-speed connection"
- set tcp($i) [$ns_ create-highspeed-connection TCP/Reno $n($i) TCPSink $n([expr $i+$c_sources+$sources]) $i]
- if { $ecn } { $tcp($i) set ecn_ 1 }
- } else {
- puts "cerating normal $T($i) connection"
- set tcp($i) [$ns_ create-connection $tcptype $n($i) TCPSink $n([expr $i+$c_sources+$sources]) $i]
- if { $ecn } { $tcp($i) set ecn_ 1 }
- }
- if {$hstcpflag==1} {
- [set tcp($i)] set windowOption_ 8
- [set tcp($i)] set low_window_ 12.5
- [set tcp($i)] set high_window_ 12500
- [set tcp($i)] set high_p_ 0.0000096
- [set tcp($i)] set high_decrease_ 0.1
- puts "windowOption = [$tcp($i) set windowOption_]"
- puts "low_window = [$tcp($i) set low_window_]"
- puts "high_window = [$tcp($i) set high_window_]"
- puts "high_p_ = [$tcp($i) set high_p_]"
- puts "high_decrease = [$tcp($i) set high_decrease_]"
- }
- set F($i) [new Application/FTP]
- $F($i) attach-agent $tcp($i)
- $ns_ at [expr [start_time]+[expr ($i-1)*2]] "$F($i) start"
- }
- # tracing for sat links
- $ns_ trace-all-satlinks $tracefd
- # If TCP is in the $traces variable, ask the TCP aganets to trace their
- # cwnd_ & seqno_ variable to a file of teh form $file.tcp_trace.source_number
- if { [lsearch $traces "TCP"] != -1 } {
- for {set i 1} {$i<= [expr $sources+$c_sources]} {incr i} {
- $tcp($i) trace cwnd_
- $tcp($i) trace t_seqno_
- $tcp($i) attach [open "$file.tcp_trace.$i" "w"]
- }
- }
- # set queue size to pipe size
- $ns_ queue-limit $n(99) $n(100) $val(ifqlen)
- $ns_ queue-limit $n(101) $n(102) $val(ifqlen)
- # If $traces includes "queue" use the trace-quere facility to put the queue
- # trace out into $file.queue1. See the docs for the format.
- if { [lsearch $traces "queue"] != -1 } {
- $ns_ trace-queue $n(99) $n(100) [open "$file.queue1" "w"]
- }
- # setup routing
- set satrouteobject_ [new SatRouteObject]
- $satrouteobject_ compute_routes
- # Stop the sim at $duration
- puts "duration = $durationn"
- $ns_ at $duration "stop"
- $ns_ at $duration "puts "NS EXITING..." ; $ns_ halt"
- # start up.
- puts "Starting Simulation..."
- $ns_ run
- }
- # traces are the set of info to be put out
- set traces [ list "TCP" "queue" ]
- # this boring code sets the given parameters from teh command line in order or
- # assigns defaults if they're not given.
- if { [llength $argv]>0} then { set sources [lindex $argv 0]}
- else {set sources 1}
- if { [llength $argv]>1} then { set duration [lindex $argv 1]}
- else {set duration 100}
- if { [llength $argv]>2} then { set file [lindex $argv 2]}
- else {set file "no-loss"}
- if { [llength $argv]>3} then { set qlen [lindex $argv 3]}
- else {set qlen 50 }
- if { [llength $argv]>4} then { set tcptype [lindex $argv 4]}
- else {set tcptype "TCP/Reno"}
- if { [llength $argv]>5} then { set queuetype [lindex $argv 5]}
- else {set queuetype "RED"}
- if { [llength $argv]>6} then { set seed [lindex $argv 6]}
- else {set seed 0}
- if { [llength $argv]>7} then { set c_sources [lindex $argv 7]}
- else {set c_sources 0}
- if { [llength $argv]>8} then { set delay [lindex $argv 8]}
- else {set delay "10ms"}
- if { [llength $argv]>9} then { set rate [lindex $argv 9]}
- else {set rate "100k"}
- if { [llength $argv]>10} then { set ecn [lindex $argv 10]}
- else {set ecn 1 }
- # Start the sim
- puts "sources=$sources, duration=$duration, file=$file, qlen=$qlen, tcptype=$tcptype, queuetype=$queuetype, seec=$seed, c_sources=$c_sources"
- setup $tcptype $queuetype $sources $qlen $duration $file $seed $c_sources $delay $rate $ecn