TCP Traffic - Computer Networking Lab 3

Resources


Description 

  • This module gives students experience generating and analyzing TCP flows. Students will use iperf to create a flow and view the sawtooth behavior. A second flow will then be introduced to show how TCP flows share a link.
Objective
  • Use iperf to generate TCP traffic
    • Start the iperf server; this allows the node to receive iperf traffic. The ampersand(&) allows the command to run in the background while the console is in use.
      • iperf -s &
    • Start the iperf client; this opens a TCP connection to the iperf server on the server node and begins sending packets. The (-c) indicates that iperf should run in clinet mode and it should connect to the host named "server." The "-i 10" tell iperf to print updates every 10 seconds and "-t 180" indicates that the client should run for 180 seconds before closing the connection.
      • iperf -c server -i 10 -t 180 &
  • Have an understanding of how TCP utilizes and shares a link's capacity
    • TCP uses the link's capacity with bandwidth need going up and down stream 
  • Be able to adjust the MTU on an interface
    • A GRE tunnel is used to connect nodes from different aggregates. When a GRE tunnel is used, it is necessary to adjust the Maximum Transmission Unit (MTU) size for the interfaces. 
      • sudo ifconfig <interface name> mtu 1400
New Vocab

  • iperf
    • tool for measuring TCP and UDP bandwidth performance



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