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→IPtables overview
::::<pre>ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED</pre>
:* '''Rules are applied to:''' '''chains''' (e.g. ''input/output'') and contain information regarding the type of traffic they apply to. For example, '''protocols''' such as ''tcp/udp/icmp'', '''port numbers''' such as ''22 (SSH), 80 (HTTP), 443 (SHTTPHTTPS)'', '''addresses''', and many other things.
::Let's look at how these rules would apply to a simple web connection (HTTP - port 80):