Iptables Tutorial 1.2.2

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Now, after warning you about the inherent problems of doing level 7 filtering in iptables and netfilter, there is actually a set of patches that has attacked these problems. This is called http://l7-filter.sourceforge.net/. It can be used to match on a lot of layer 7 protocols but is mainly to be used together with QoS and traffic accounting, even though it can be used for pure filtering as well. The l7-filter is still experimental and developed outside the kernel and netfilter coreteam, and hence you will not hear more about it here.


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