    /sbin/iptables -t nat --new-chain PortForwarding
    /sbin/iptables -t nat --new-chain PortForwarding_1
    /sbin/iptables -t nat --insert PREROUTING --jump PortForwarding
    /sbin/iptables -t nat --append PortForwarding --destination $OUTERNET \
                    --jump PortForwarding_1
