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

Page 27

n 192.168.22.2(toRAS_Net)

EquipmentFaultToleranceandRedundancy:

Althoughitispossibletorunthefirewall/routingservicesonhighlysophisticated

clusterequipments,lowercostalternativesarepossible.Firstofall,machinelevel

faulttolerancecanbeestablishedbyusingDiskMirroringandUPS:

n With DiskMirroring,dataiswrittentotwoduplicatediskssimultaneously.Ifone

ofthediskdrivesfails,thesystemcaninstantlyswitchtotheotherdiskwithout

anylossofdatanordowntime.

n UPS(uninterruptiblepowersupply)isaspecialkindof powersupplythatusesa

batterytomaintainpowerintheeventofapoweroutage.Itenablesautomated

backupandshutdownproceduresincasethere'sasuddenpowerfailure.

Another thingthatcan bedoneforredundancyistomaintainanidenticalsystemasa

standbysystemforthemostcriticalfirewall androuter implemented.Thisstandby

machineshouldhavetheexactsamehardwareandsoftwareconfigurationasthe

“original”.

Toimplementastandbymachine,thefollowingstepsarerecommended:

1. Completetheconfigurationofthe“original”system.

2. Backupthesecurity/routingpolicyandobjectdatabaseaswellasanyother

exportablesecurity/routingsettingstoremovablemedias.Keeptheminasafe

andsecureyetassessableplace.

3. Producehardcopydocumentsofthesecurity/routingpolicysettings.Keepthem

inasafeandsecureyetassessableplace.

4. UseadiskcloningutilitysuchastheNortonGhostutilitytocreateanimageof

theentiresystemdisk.

5. Createtheidenticalstandbysystembyrestoringtheimagetoanidentical

computer.

6. Testthestandbysystemwhilethe“original”isoff.

Keepinmind,utilitylikeGhostwillcloneEVERYTHING,includingthesystem’s

SID.Thisisperfectlyokaslongastheoriginalsystemandthestandbysystem are

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Eicon Networks S92 Manual do Utilizador Página 27