Eicon Networks S92 Manuel d'utilisateur télécharger pdf (Page 85)

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

Page 85

2,

DonotenabletheSynDefenderGateway option.ItisnotlikelytoseeSynflood

attacksagainstthisfirewallfromtheinsidenetwork.

3,

Configurethefollowingrules:

n Allow AdminaccesstoallserversinPublic_Servicesviaanytraffic.

n AllowStaffaccesstoWWWviaHTTPandHTTPS.

n AllowStaffaccesstoDNSviaDNSquery.

n AllowDevaccesstoWWW viaHTTP andHTTPS.

n AllowDevaccesstoDNS viaDNSquery.

n AllowRAS_UseraccesstoWWWviaHTTPandHTTPS.

n AllowRAS_UseraccesstoDNSviaDNSquery.

n AllowInt_EmailtoreceiveSMTPalertsfromIDS.Weneedthisrulesothatthe

alertscanbeforwardedtotheadministrator’smailbox.Keepinmindthough,

thatwiththisruleinplace,theIDSmustbeabsolutelysecure,oranintrusion

pathtotheinsidenetworkwillcometrue.

n AllowInt_EmailtoinitiateSMTPrequeststoEmail.Weneedthisrulesothat

theinternalemailsystemcaninitializecommunicationwiththeexternalonefor

sendingoutboundemailsandretrievinginboundqueuedemails

4,

Dropandlogeverythingelse. ThisrulemustbetheLASTrule.

Exceptforthelast“Dropeverythingrule”,theorderoftheruleswedefineddoes

notmattergiventhesmallnumberofrulesandtheirnonconflictingnature.

5,

VerifythepolicyviaPolicy – Verify.

6,

Installthepolicy viaPolicy –Install.InstallthepolicyontoSELF.

7,

Performsomebasictesting.

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Eicon Networks S92 Manuel d'utilisateur Page 85