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::# For the ''request'', the '''source port (sport) is 40112''' and the '''destination port (dport) is 80'''
::# For the ''response'', the '''source port is 80''' and the '''destination port is 40112'''
::# 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 discussed.
