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Environment/Versions STC GUI Answer Create 2 devices on STC GUI and 1 streamblock. While configuring the Streamblock: Add TCP or UDP header Right click on Source and/or Destination Port and go to Insert Modifiers... Configure the modifiers. Count refers to the number of times the GUI will increase the port number. Step refers to the amount of port number to be increased to the previous port number. Value refers to the initial port.