title: Python - Man in the Middle
body: <p>I want to catch a packet my computer is sending, modify it and send it. I can't use sniff, because it gives me a copy of the packet. The packet itself is sent.
  I want to stop the sending of the packet, change it and then send it forward - MitM attack.</p>
  
  <p>How can I do it using scapy?</p>