    /sbin/iptables --new-chain ForwardedTCP
    /sbin/iptables --new-chain ForwardedTCP_1
    /sbin/iptables --append FORWARD --protocol tcp --syn --jump ForwardedTCP
    /sbin/iptables --append ForwardedTCP --protocol tcp --syn --jump ForwardedTCP_1
    # Catch any returns.
    /sbin/iptables --append ForwardedTCP --protocol tcp --syn --jump denylog
