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YuChakTinMichael‘sGIACGCFWProjectAssignment

Page 14

simplicityasthekeytosuccessfulfirewallimplementation

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Inordertomakesimplerulebasepossible,wemustdividethedefenseworkinto

piecesandhavethesepiecesdistributedamongmultiplefirewalls.Witheachfirewall

enforcingasmallersubsetoftheoverallpolicies,thefollowingbenefitscanbe

achieved:

n Reducethecomplexityofeachrulebase.

n Reducethechanceofmisconfigurationandruleconflictsineachrulebase.

n Reducetherulebaseprocessingoverheadoneachfirewall.

n Eliminatesinglepointoffailure.

n Easytroubleshooting.

n Scalability.

Theabovebenefitscannotbeobtainedwithoutpayingaprice.Thetradeoffsare:

n Additionalhardwarehavetobepurchased.

n Additionalmaintenanceworksareexpected.

n Itcanbearguedthatthemorehardwareinvolved,thehighertheprobabilityof

hardwarefailureleadingtonetworkdowntime.

n Somesecurityadministratorsfearthattheword“simplicity”meansinferior

technicalskills.

Therearealwaystradeoffs.Idecidedtogoforadesignwhichadvocates

Simplicity.Inmydesign,Itriedtohaveasfewrulesaspossiblebeingenforcedat

eachfirewall.

IPInfrastructure

Oncethetechnicalrequirementshavebeen defined,theGIACnetworkissegmented

intomultiplesubnetsforprotectionunderdifferentfirewallsatdifferentlayers.

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http://www.enteract.com/~lspitz/rules.html

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Eicon Networks S92 Manual do Utilizador Página 14