title: Forward network connection over ssh so that my outbound IP changes
body: <p>A service, for example an FTP server, only accepts connections from a specific network, where all users will have the same external IP-adress.</p>
  
  <p>I want to connect to this service, but I'm currently not inside the allowed network.</p>
  
  <p>I have ssh access to a server inside the network.</p>
  
  <p>How do I use ssh to tunnel a certain port from my local machine, through a machine on the internal network, to the final service, so that any client opening the correct port won't notice any difference?</p>