def opt_remoteforward(self, f):
        """
        Forward remote port to local address (rport:host:port)
        """
        remotePort, connHost, connPort = f.split(':')  # Doesn't do v6 yet
        remotePort = int(remotePort)
        connPort = int(connPort)
        self.remoteForwards.append((remotePort, (connHost, connPort)))

        Forward remote port to local address (rport:host:port)
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/scripts/conch.py