Você pode tentar me seguir
echo > /etc/sysconfig/iptables
service iptables restart
iptables -I INPUT -p tcp -m state --state NEW -m multiport ! --dports 30033,10011,22 -j DROP
iptables -I INPUT -p udp -m multiport --dports 1000:2009,2011:11000 -j ACCEPT
iptables -I INPUT -p udp -m multiport -s 194.97.114.3 --dports 1000:2009,2011:11000 -j DROP