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:* '''Rules are applied to:''' '''chains''' (e.g. ''input/output''), '''protocols''' (e.g. ''tcp/udp/icmp''), and '''ports''' (e.g. ''22, 80, 443'').
::# 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 controlling the '''incoming traffic on the server''', which in our example, the '''chain is: INPUT''', the '''protocol is: tcp''', and the '''destination is: port 80'''.
