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:* In this diagram there are two sets of IPtables rules that apply: OUTPUT/INPUT on the client and INPUT/OUTPUT on the server.
* Outbound traffic (Firefox connecting to the web server) is rarely blocked unless there is a business policy to prevent some kind of traffic, and even then it's usually done on a router (that's a topic for later).
* Inbound traffic is of two distinct types, in our diagram we have both: