description string, portForwardDesc string) (portForward, error) {
hostPort, err := s.portAllocator.AllocatePort()
cmd := exec.Command(

"iptables",
"-t",
"nat",
"-A",
"PREROUTING",
"-p",
"tcp",
"--dport",
strconv.Itoa(int(hostPort)),
"-j",
"DNAT",
"--to-destination",