1 iptables -t filter -A INPUT -m tos --tos Minimize-Delay -j ACCEPT
2 iptables -t filter -A INPUT -m tos --tos Maximize-Throughput -j ACCEPT
3 iptables -t filter -A INPUT -m tos --tos Maximize-Reliability -j ACCEPT
4 iptables -t filter -A INPUT -m tos --tos Minimize-Cost -j ACCEPT
5 iptables -t filter -A INPUT -m tos --tos Normal-Service -j ACCEPT
6 iptables -t filter -A INPUT -m tos ! --tos Normal-Service -j DROP