The CrushTunnel process can be integrated into an existing workflow using a standalone machine acting as the tunnel provider, or programmatically through your own code.

Here is a stand alone example:

java -Dcrushtunnel.pasv.ip=71.123.244.10 -Dcrushtunnel.pasv.port.start=2000 -Dcrushtunnel.pasv.port.stop=2100 -Djava.awt.headless=true -cp CrushTunnel.jar com.crushftp.tunnel.AutoChannelProxy protocol=https host=www.crushftp.com port=443 username=demo password=demo localport=2121

That command would start the tunnel and make it a FTP server handling requests that ultimately ended up going through the tunnel and to the main CrushFTP server on the other side. You can control the port ranges for PASV, and the IP that is given to the FTP clients for PASV mode. The tunnel goes over HTTPS, so everything is encrypted between CrushTunnel and the server.

The tunnel adds some overhead to the transaction, so its suited best for large transfers where it can accelerate them avoiding latency issues. Small files do not benefit from the tunnel other than being inside the encrypted network.

To programmatically start the tunnel, include the CrushTunnel.jar file.