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Iptables - http module question.

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http://www.linuxquestions.org – Why do some people load the tcp module and some people don't ? iptables -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT Then another one says: iptables -A INPUT -p tcp --dport 80 -j ACCEPT From what I have read -m stands for module, what are the advantages from using -m tcp ? Thanks - The noob. ;) (HowTos)