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::# Since the '''RELATED,ESTABLISHED''' rule already exists, we are only concerned about <u>'''controlling'''</u> the '''incoming traffic on the server''', which in our example, the '''chain is: INPUT''', the '''protocol is: tcp''', and the '''destination is: port 80'''.
:* '''Basically , all other services that you learn to install, configure, and maintain will required the same knowledge just work in a similar way as discussedabove'''.
