ZyXEL Communications P-2612HNU-F1 User Manual page 214

Chapter 13 Firewall
Is it possible to modify the rule to be more specific? For example, if IRC is blocked
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for all users, will a rule that blocks just certain users be more effective?
Does a rule that allows Internet users access to resources on the LAN create a
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security vulnerability? For example, if FTP ports (TCP 20, 21) are allowed from the
Internet to the LAN, Internet users may be able to connect to computers with
running FTP servers.
Does this rule conflict with any existing rules?
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Once these questions have been answered, adding rules is simply a matter of
entering the information into the correct fields in the web configurator screens.
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P-2612HNU(L)-FxF User's Guide