Eicon Networks S92 Manuel d'utilisateur télécharger pdf (Page 130)

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

Page 130

WithEiconcardConnectionsforWindows2000,allpacketsareforwardedfora

connectionforwhichnoIPpacketfiltersiscreated.However,buildingtoomany

filterscanbecostlyasmoreprocessinghastobedoneforeverypackethandled.We

definitelydonotwantRouter_Eiconcardtobecomethenetworkbottleneck.

RulesandOrders

Sinceallinternalsegmentsareprotectedbymultiplelayersoffirewall,screening

activitiesatRouter_Eiconcardshouldberestrictedtoonlydroppingincominginternet

trafficthathassourceaddressesbelongingtoGIAC’sinternalIPsubnets(wedothis

toprotectthenetworkagainstspoofingattack). Thiswaydelaycanbeminimizedat

thischokingpointofthenetwork.

Accordingtowebopedia.com,spoofingis:

“atechniqueusedtogainunauthorizedaccesstocomputers,wherebytheintruder

sendsmessagestoacomputerwithanIP addressindicatingthatthemessageis

comingfromatrustedhost.ToengageinIPspoofing,ahackermustfirstusea variety

oftechniquestofindanIPaddressofatrustedhostand thenmodifythepacket

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Eicon Networks S92 Manuel d'utilisateur Page 130