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iptables tcp NEW state

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linux-howto

http://serverfault.com – I am new to iptables and learning them from here I have questions about the following: iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT This is the rule that does most of the work, and again we are adding (-A) it to the INPUT chain. Here we're using the -m switch to load a module (state). The state module is able to examine the state of a packet and determine if it is NEW, ESTABLISHED or RELATED. NEW refers to incoming packets that are new incoming connections that weren't initiated by the host system. ESTABLISHED and RELATED refers to incoming packets that ar (HowTos)