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Explicit matches are those that have to be specifically loaded with the -m or --match option. State matches, for example, demand the directive -m state prior to entering the actual match that you want to use. Some of these matches may be protocol specific . Some may be unco
Addrtype match
The addrtype module matches packets based on the address type. The address type is used inside the kernel to put different packets into different categories. With this match you will be able to match all packets based on their address type according to the kernel. It should be noted that the exact meaning of the different address types varies between the layer 3 protocols. I will give a brief general description here however, but for more information I suggest reading Linux Advanced Routing and Traffic Control HOW-TO and Policy Routing using Linux. The available types are as follows:
Table 10-6. Address types