Iptables Tutorial 1.2.2

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Generic matches

This section will deal with Generic matches. A generic match is a kind of match that is always available, whatever kind of protocol we are working on, or whatever match extensions we have loaded. No special parameters at all are needed to use these matches; in other words. I have also included the --protocol match here, even though it is more specific to protocol matches. For example, if we want to use a TCP match, we need to use the --protocol match and send TCP as an option to the match. However, --protocol is also a match in itself, since it can be used to match specific protocols. The following matches are always available.

Table 10-1. Generic matches


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