Iptables Tutorial 1.2.2

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Tos match

The TOS match can be used to match packets based on their TOS field. TOS stands for Type Of Service, consists of 8 bits, and is located in the IP header. This match is loaded explicitly by adding -m tos to the rule. TOS is normally used to inform intermediate hosts of the precedence of the stream and its content (it doesn't really, but it informs of any specific requirements for the stream, such as it having to be sent as fast as possible, or it needing to be able to send as much payload as possible). How different routers and administrators deal with these values depends. Most do not care at all, while others try their best to do something good with the packets in question and the data they provide.

Table 10-30. Tos match options


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