ns3-sim

An ns3 simulation script to compare various TCP variants under congestion

Install Instructions:

Requirements:

• ns3(3.26)
  Steps:
• Install ns3 and put ns3.cc in the scratch directory.
• Run the script using ./waf --run "ns3"
• For command line options and help, ./waf --run "ns3 --PrintHelp"

Topology

n0 ----------- n1

Topology consists of two nodes N0 and N1 connected by a link of bandwidth 1Mbps and link delay 10ms. We are using a drop-tail queue at the link.

Simulation

There is a TCP agent at N0 which creates FTP traffic destined for N1. There are 5 CBR traffic agents of rate 300 Kbps each at N0 destined for N1.
The timing of the flows is as follows:

• FTP starts at 0 sec and continues till the end of simulation
• CBR1 starts at 200 ms and continues till end
• CBR2 starts at 400 ms and continues till end
• CBR3 starts at 600 ms and stops at 1200 ms
• CBR4 starts at 800 ms and stops at 1400 ms
• CBR5 starts at 1000 ms and stops at 1600 ms
• Simulation runs for 1800 ms

Plots