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Inline NAC Design Procedures

5-28 Design Procedures

Figure 5-8 Service for the Quarantine Role

Furthermore,theQuarantinePolicyandothernetworkinfrastructuredevicesmustbeconfigured

toimplementHTTPtrafficredirectionforquarantinedend‐systemstoreturnwebnotificationof

thequarantinedstateofanend‐system.

Unregistered Policy

IfMAC(network)registrationisconfiguredintheNACdeployment,an“Unregistered”policy

canbeassignedtoconnectingend‐systemswhiletheyareunregisteredonthenetwork.This

policymustbeconfiguredtoallowbasicservicessuchasARP,DNS,DHCP,andtoimplement

HTTPtrafficredirectiontoreturnweb‐based

notificationforunregist eredend‐systems.(Because

thisconfigurationissimilartotheQuarantinePolicyandtheAssessmentPolicy,thosepolicies

couldbeassignedtounregisteredend‐systems,ifdesired).

Inline NAC Design Procedures

ThefollowingsectioncontinuestheEnterasysNACdesignprocedurewithstepsspecifically

relatingtotheimplementationofinline NACwiththeNACController.

1. Determine NAC Controller Location

BecausetheNACControllerisplacedinlinewithtrafficsourcedfromconnectingend‐systems,the

locationofNACControllersisdirectlydependentonthenetworktopology.NACControllersare

typicallyplacedbetweentheedgewhereend‐systemsconnecttothenetwork(forexample,the

wiredandwirelessaccessedge,orthe

remoteaccessedgebehindaVPNconcentrator)andthe

networkʹscoreanddatacenterwheremissioncriticalinfrastructureresourcesreside.Thisway,

noncompliantend‐systemscanberestrictedfromcommunicatingtomissioncriticalresources.

WiththeNACControlleractingastheauthorizationpointfortrafficenforcementwithinline

NAC,there

isafundamentaltrade‐offwhenpositioningtheNACControllerinthenetwork

topology:theclosertheNACControllerisplacedtotheedgeofthenetwork,thehigherthelevel

ofsecurityisachieved,inthatend‐systemsareauthorizedclosertothepointofconnectionand

end‐systems

deemednoncomplianthaveaccesstoasmallersetofnetworkresources.

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