Eicon Networks S92 Manuel d'utilisateur télécharger pdf (Page 96)

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

Page 96

Internal_Servers(192.168.18.0)configuredasTrusted.

ConfiguretheSecurityLevel:

Weneedthehighestpossiblelevelofsecurityhere. Tosetsuchsecurity,useCustom

Settings,andseteveryblockingoptiontoHigh.Allthealertoptionsshouldbe

enabledaswell.

ConfiguretheAdvancedOptions:

IntheAdvancedOptionssection,enablethefollowingoptions:

n BlockIGMPProtocol:IPmulticastisnottobeusedinournetworkanyway,so

thisoptionshouldbeblocked.

n StealthBlockedPorts:Thiscausestheblockedportstonotrespondtoenquiries

fromtheoutside.Suchoptioneliminatesthehacker’sopportunityoflearningany

unnecessary networkinformation.

n BlockFragmentedIPPackets:FragmentedIPpacketsareoftenusedasawayto

attacksystems.Thisoptiondisablessuchthreat.

ConfigureIntrusionDetection:

NortonFirewallcandetectportscanattemptsandautomaticallyblocktheattackers

frommakingfurtherconnectionattempts.

ConfigureLogging:

Weshouldalwaysoptforloggingasmuchinformationaspossible.SettheReporting

LeveltoHighandensurethatyourdriveislargeenoughtoholdthelargeamountof

loggeddata.

BasicTesting: 

n FromInternal_Dev,accessafileshareinInternal_Servers.Therequestshould

succeed.

n FromInternal_Dev,accessaninternetwebsiteviaISA_Cache’sport8080.The

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Eicon Networks S92 Manuel d'utilisateur Page 96