Sunday, February 12, 2012

Comparision of roution algm ns [networks lab]


Comparision of roution algm 
set ns [new Simulator]
$ns color 1 Blue
$ns color 2 Red
set nf [open /home/student/Desktop/ex12b2910007/vs.nam w]
$ns namtrace-all $nf
set nd [open /home/student/Desktop/ex12b2910007/vs.tr w]
$ns trace-all $nd
set f2 [open /home/student/Desktop/ex12b2910007/DV.tr w]
set last_ack 0
proc record {} {
                        global ns null tcp f2 last_ack
                        set time 0.2 ;#Set Sampling Time to 0.2 Sec
                        set c [$tcp set ack_]
                        set d [$tcp set packetSize_]
                        set now [$ns now]
                        if { $c > 0 } {
                                                set e [expr $c - $last_ack]
                                                puts $f2 "$now [expr $e*$d*8/$time]"
                                                set last_ack $c
                        } else {
                                                                                                                                                                                                                                                                                                                                                                                                                                                puts $f2 "$now 0"                                                                                                                                                                                                                                                                                                                                                                                  }
                        $ns at [expr $now+$time] "record" ;# Schedule Record after $time interval sec
}
proc finish {} {                                                                                                                                                                                                                                                                                                                                                                                                                                        global ns nf nd f2
                        $ns flush-trace             
                        close $nf
                        close $nd
                        close $f2
                        exit 0
 }
 $ns rtproto DV
 set n0 [$ns node]
 set n1 [$ns node]
 set n2 [$ns node]
 set n3 [$ns node]
 set n4 [$ns node]
 set n5 [$ns node]
 set n6 [$ns node]

 $ns duplex-link $n0 $n1 2Mb 10ms DropTail
 $ns duplex-link $n1 $n2 2Mb 10ms DropTail
 $ns duplex-link $n2 $n5 1.7Mb 20ms DropTail
 $ns duplex-link $n5 $n4 2Mb 10ms DropTail
 $ns duplex-link $n4 $n3 2Mb 10ms DropTail
 $ns duplex-link $n3 $n1 2Mb 10ms DropTail


$ns duplex-link-op $n0 $n1 orient right     
$ns duplex-link-op $n1 $n2 orient down
$ns duplex-link-op $n1 $n3 orient right
$ns duplex-link-op $n2 $n5 orient right
$ns duplex-link-op $n3 $n4 orient right-down
$ns duplex-link-op $n5 $n4 orient right-up
    
 set tcp [new Agent/TCP]
 $ns attach-agent $n0 $tcp
 set sink [new Agent/TCPSink]
 $ns attach-agent $n5 $sink
 $ns connect $tcp $sink
 $tcp set fid_ 1
 set ftp [new Application/FTP]
 $ftp attach-agent $tcp
 $ftp set type_ FTP
 $ns rtmodel-at 1.0 down $n1 $n2
 $ns rtmodel-at 2.5 up $n1 $n2

 $ns at 0.0 "record"
 $ns at 0.1 "$ftp start"
 $ns at 4.5 "$ftp stop"
 $ns at 4.8 "$ns detach-agent $n0 $tcp ; $ns detach-agent $n5 $sink"
 $ns at 5.0 "finish"
 $ns run

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