Forward or Behind of Firewall iptables (netfilter)

["Jose Manuel Colon" <jsmclon () gmail com>]

Hi, i would like to know, how can i listen behind of my firewall? For
example, if i have set drop ALL (policy) and i have a few rules: snort
should listen only the connections of rules (or other behind the firewall
for any reason, i don't know if the hacker can open or not connections).

How can i do this? I have one PC connected.

Thank you very much, I appreciate your help.

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