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Generating TCP traffice

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• Generating Traffic for a TCP Agent
  • The standard traffic generator for TCP protocol is the FTP application.

  • The FTP application transmits continuously - as long as the TCP protocol permits.

  • FTP application are created using:

    new Application/FTP

  • Example:

    set ftp1 [new Application/FTP]

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• Associating FTP Traffic Generator with a TCP protocl module
  • You need to associate a FTP traffic generator with a sending TCP module

  • The association is made using the attach-agent method defined in the Application/FTP class.

  • Example:

    set tcp1 [new Agent/TCP/Reno] set ftp1 [new Application/FTP] $ftp1 attach-agent $tcp1

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• Starting the FTP traffic generator
  • The FTP traffic generator is run (started) using the start method defined in the Application/FTP class.

  • Example:

    set ftp1 [new Application/FTP] $ftp1 start // Start the FTP application

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• Stopping the FTP traffic generator
  • The FTP traffic generator canbe stopped using the stap method defined in the Application/FTP class.

  • Example:

    set ftp1 [new Application/FTP] $ftp1 stop // Stop the FTP application

  • NOTE: the TCP module does not need to be stopped and in fact, cannot be stopped.

    When the FTP traffic generator stops generating traffic, TCP will have no data to send and will "go quiet".

    You can start the FTP again after stopping it.