title: Follow tcp stream - Where does field "Stream index" come from?
body: <p>Wireshark has a that feature called <em>"follow tcp stream"</em>, under the menu item <em>"Analyze"</em>.</p>
  
  <p>When I use it, a screen capture filter is generated, something like:</p>
  
  <blockquote>
    <p>tcp.stream eq 1</p>
  </blockquote>
  
  <p>Where does this index come from?</p>
  
  <p>I can't find any field in the packet that contains it...</p>