ftp-port-proxy

Acts as an FTP server that will proxy all requests to an upstream active FTP server and translate the PORT command to any external IP that you choose.

Usage of ./ftp-port-proxy:
  -ext-ip string
        The public IP to rewrite FTP port commands from.
  -host-address string
        The IP address to bind the port on. (default "0.0.0.0")
  -host-port int
        The port that this FTP proxy will serve on. (default 20021)
  -server string
        The FTP server host or IP to connect to.
  -server-port int
        The FTP server port number. (default 21)
  -logtostderr=false
        Logs are written to standard error instead of to files.
  -stderrthreshold=ERROR
        Log events at or above this severity are logged to standard
        error as well as to files.
  -log_dir=""
        Log files will be written to this directory instead of the
        default temporary directory.
  -version
        Show version number