tos This module matches the 8 bits of Type of Service field in the IP header (ie. including the precedence bits). --tos tos The argument is either a standard name, (use iptables -m tos -h to see the list), or a numeric value to match. iptables -m tos -h TOS match v1.2.6a options: [!] --tos value Match Type of Service field from one of the following numeric or descriptive values: Minimize-Delay 16 (0x10) Maximize-Throughput 8 (0x08) Maximize-Reliability 4 (0x04) Minimize-Cost 2 (0x02) Normal-Service 0 (0x00) INPUT and FORWARD