Control Flows

The control flows are established after the three-way handshake is complete.

• Control flow from FTP client to FTP server. TCP destination port is 21.

  TCP           1.1.79.2:14083 ->        2.2.2.2:21    Watch    I              13
      NAT source        1.1.79.2:14083   ->   194.250.1.237:50118
  

• Control flow from FTP server to FTP client. TCP source port is 21.

  TCP            2.2.2.2:21    ->  194.250.1.237:50118 Watch    O              12
      NAT dest     194.250.1.237:50118   ->        1.1.79.2:14083