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*# For the response the source port is 80 and the destination port is 40112
* Because we have the RELATED,ESTABLISHED rule we only care about controlling the incoming traffic on the server, which in our example on the server is INPUT TCP destination port 80.
== What you need to learn ==
We don't expect you to become firewall experts but there are some basics you need to become familiar with this week:
* What is a '''chain'''
* '''Which chain''' applies to which traffic
* What's the '''default action''' for a chain and when that applies
* What '''order the rules are executed in'''
* '''Reading and/or creating a rule''' for a specific service. That includes a basic understanding of:
** '''Ports'''
** '''Protocols'''
The best way to learn that is to practice.
= Setup =