(fixed RTO)ACK (Dynamic delay ACK)TCP(TCP DoorTCP Detecting out
of order and Response)
TCP NS2
NS2NSNSns/tcl/libns-deafult.tclNSset
NS:
(1):;at;run(2):namtrace(3):;
(4):agent
(5):FTPCBR;agent.
(6):at(7):
---nodeslinksagents
simulatornodeSimplex-linkDuplex-link
Agents agentsagentsagents agents/typetypeagents
agents simulatorattach-agentsagents
agentagentattach-sourceattach-trafficagent
#===================================# Agents Definition
#===================================set tcp_(0) [$ns_
create-connection TCP $node_(0) TCPSink $node_(1) 0]$tcp_(0) set
window_ 32$tcp_(0) set packetSize_ 512set ftp_(0) [$tcp_(0)
attach-source FTP]$ns_ at 0.0 "$ftp_(0) start"
TCP Agent agent agent
agent sink
agent
TCP agent Agent/TCP - a tahoe TCP sender Agent/TCP/Reno - a Reno
TCP sender Agent/TCP/Newreno - Reno with a modification
Agent/TCP/Sack1 - TCP with selective repeat (follows RFC2018)
Agent/TCP/Vegas - TCP Vegas Agent/TCP/Fack - Reno TCP with forward
acknowledgment
TCP agent Agent/TCPSink - TCP sink with one ACK per packet
Agent/TCPSink/DelAck - TCP sink with configurable delay per ACK
Agent/TCPSink/Sack1 - selective ACK sink (follows RFC2018)
Agent/TCPSink/Sack1/DelAck - Sack1 with DelAck
#TCP RenoFTP
set tcp1 [new Agent/TCP/Reno]$tcp1 set window_ 24$tcp1 set fid_
2$ns attach-agent $n2 $tcp1set tcp1sink [new Agent/TCPSink]$ns
attach-agent $n3 $tcp1sink$ns connect $tcp1 $tcp1sinkset ftp1 [new
Application/FTP]$ftp1 attach-agent $tcp1
#TCP VegasFTP $set tcp0 [new Agent/TCP/Vegas] $tcp0 set v_alpha_
1 $tcp0 set v_beta_ 3 $tcp0 set window_ 24 $tcp0 set fid_ 1 $ns
attach-agent $n0 $tcp0 set tcp0sink [new Agent/TCPSink] $ns
attach-agent $n1 $tcp0sink $ns connect $tcp0 $tcp0sink set ftp0
[new Application/FTP] $ftp0 attach-agent $tcp0
Configuration Parameters
Agent/TCP set window_ 20 ;# max bound on window sizeAgent/TCP
set windowInit_ 1 ;# initial/reset value of cwndAgent/TCP set
windowOption_ 1 ;# cong avoid algorithm (1: standard)Agent/TCP set
windowConstant_ 4 ;# used only when windowOption != 1Agent/TCP set
windowThresh_ 0.002 ;# used in computing averaged windowAgent/TCP
set overhead_ 0 ;# !=0 adds random time between sendsAgent/TCP set
ecn_ 0 ;# TCP should react to ecn bitAgent/TCP set packetSize_ 1000
;# packet size used by sender (bytes)Agent/TCP set bugFix_ true ;#
see explanationAgent/TCP set slow_start_restart_ true ;# see
explanationAgent/TCP set tcpTick_ 0.1 ;# timer granulatiry in sec
(.1 is NONSTANDARD)Agent/TCP set maxrto_ 64 ;# bound on RTO
(seconds)Agent/TCP set dupacks_ 0 ;# duplicate ACK counterAgent/TCP
set ack_ 0 ;# highest ACK received
TCP under NS2
Functions for Sending Data
Functions for Window Management
Functions for Processing ACKs
send_much (force, reason, maxburst ) maxburst_
output (seqno, reason) maxseq_TCP
Functions for Window Management windowwnd_wnd_advertised
