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Negative firewall rules

How do I go about setting up a negative firewall rules to block connections/services that do NOT go to a certain destination?


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  • do rules overwrite each other
      Processing through rules stops if a match is found.  With your example, if the traffic matches rule #3, a block rule, then rules 4 (allow) through whatever will not be evaluated against for that packet.
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  • do rules overwrite each other
      Processing through rules stops if a match is found.  With your example, if the traffic matches rule #3, a block rule, then rules 4 (allow) through whatever will not be evaluated against for that packet.
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