    /sbin/iptables --new-chain ForwardedUDP
    /sbin/iptables --new-chain ForwardedUDP_1
    /sbin/iptables --append FORWARD --protocol udp --jump ForwardedUDP
    /sbin/iptables --append ForwardedUDP --protocol udp --jump ForwardedUDP_1
    # Catch any returns.
    /sbin/iptables --append ForwardedUDP --protocol udp --jump denylog
