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:*There are '''<u>two sets</u> of IPtables rules (chains) that apply:''' '''OUTPUT/INPUT on the client''' and '''INPUT/OUTPUT on the server'''.<br>It is important to think about from the perspective from the client as well as the server.
:* '''Outbound traffic''' from a server (like a response to the Firefox web-browser from the web-server) '''is rarely blocked <u>unless</u> there is a security policy to <u>prevent</u> some kind of traffic'''. <br>Even in that case, that security policy is usually performed on a router (this is a topic which will be discussed later in this course).
:* '''Inbound traffic is of two distinct types'''. Our diagram shows:
