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Cisco Ise 13 User Guide

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    							TheInlinePosturenode’suntrustedinterfaceshouldbedisconnectedwhentheInlinePosturenodeisbeing
configured.IftheInlinePosturenode’strustedanduntrustedinterfacesareconnectedtothesameVLAN
duringinitialconfigurationandtheInlinePosturenodeinitiallystartsafterchangingitspersona,multicast
packettrafficgetsfloodedoutoftheuntrustedinterface.Thismulticaststormcanpotentiallybringdown
devicesthatareconnectedtothesamesubnetorVLAN.TheInlinePosturenodeatthistimeisin
Maintenancemode.
Caution
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Inline Posture Node Guidelines
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    							Inline Posture Node Authorization
ThefollowingimagesillustratetheclientauthorizationflowandsessionrecoveryusingLazyFetchmechanism
forInlinePosturenode.
Figure 8: Inline Posture Node Client Authorization Flow
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Inline Posture Node Authorization
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    							Figure 9: Inline Posture Node Session Recovery Using Lazy Fetch Mechanism
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Inline Posture Node Authorization
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    							InlinePostureNodeSessionRemovalduetoClientDisconnect
WhenawirelessclientiswanderingofffromtheWLCcontrol,theWLCisrequiredtosendaRADIUS
AccountingStopsimilartotheVPNgatewaytoensurethattheInlinePosturenodecleansupthesession
correspondingtotheclient.
Deploy an Inline Posture Node
TheinitialprocessfordeployinganInlinePosturenodeisthesame,whetheritisintendedtobeastandalone
nodeorpartofanactive-standbypair.
InlinePostureissupportedontheCiscoISE3415,ISE3315,ISE3355,andISE3395platforms.Note
Procedure
Step 1ConfigureanInlinePosturenode.
Step 2CreateInlinePostureDownloadableAccessControlLists.
Step 3CreateInlinePosturenodeprofiles.
Step 4CreateanInlinePostureauthorizationpolicy.
Configure an Inline Posture Node
InlinePostureisadedicatednoderegisteredtotheAdministrationnode.YouconfigureInlinePosturefrom
theadministrationconsole,andthatconfigurationisthenreplicatedtotheInlinePosturenode.Acopyofthe
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Deploy an Inline Posture Node
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    							configurationisstoredlocallyintheadministrationdatabase.AfteranInlinePosturenodeisregistered,itis
rebooted.
TointroduceanInlinePosturenodeinyourCiscoISEnetwork,youmustfirstregistertheInlinePosturenode
withthePAN,configuretheInlinePosturesettings,andthencreateauthorizationprofilesandpoliciesthat
establishtheInlinePosturegatekeepingpolicies.
TheInlinePosturenodeisaRADIUSproxythatinterfaceswithNADsastheirRADIUSserver,makingthe
NADs(VPNgateway,WLC)RADIUSclients.Asaproxy,InlinePostureinterfaceswiththePolicyService
nodeasaclientmakingthePolicyServicenodeitsRADIUSserver.
Aftercompletingthefollowingprocedure,aNADentryisautomaticallycreatedfortheInlinePosture
node.Forastandalonenode,theIPaddressforthatnodeisused.Forahigh-availabilitypair,theservice
IPaddressfortheactivenodeisused.
Note
Before You Begin
Toperformthefollowingtask,youmustbeaSuperAdminorSystemAdmin.
InlinePostureisnotsupportedontheCiscoISE3495platform.EnsurethatyouinstallInlinePostureonany
oneofthefollowingsupportedplatforms:ISE3315,ISE3355,ISE3395,orISE3415.
FollowandapplytheguidelinesforconfiguringcertificatesforInlinePosture.RefertoCiscoIdentityServices
EngineHardwareInstallationGuide,Release1.2fordetails.
RegistertheInlinePosturenodewiththePAN.AllnodesmustberegisteredwiththePANtofunctionasa
memberoftheCiscoISEdistributedsystem.
RADIUSconfigurationismandatory.Atleastoneclientandoneserverconfigurationisnecessary.Youneed
thecorrespondingsharedsecretinformationforbothsidestocompletethisprocedure.
Haveallnecessaryconfigurationinformationforyourinstallationonhand.Forexample,youmightneedthe
trustedanduntrustedIPaddresses,serviceIPaddress,IPaddressesforotherCiscoISEnodes,sharedsecret
informationfortheRADIUSconfiguration,managementVLANID,WLC,orVPNIPaddress,andsoon.
Checkwithyoursystemarchitectforacompletelistoftheinformationyouwillneed.
DonotconfiguretheMACaddressinaMACFilterforadirectlyconnectedASAVPNdevicewithout
alsoenteringtheIPaddress.WithouttheadditionoftheoptionalIPaddress,VPNclientsareallowedto
bypasspolicyenforcement.ThisaccesshappensbecausetheVPNisaLayer3hopforclients,andthe
deviceusesitsownMACaddressasthesourceaddresstosendpacketsalongthenetworktowardthe
InlinePosturenode.
Caution
Procedure
Step 1ChooseAdministration>System>Deployment.
Step 2ChecktheInlinePosturenodecheckboxintheDeploymentNodespageandclickEdit.
Step 3ChecktheInlinePEPcheckboxontheGeneralSettingstab.TheAdministration,Monitoring,andPolicy
Servicecheckboxesareautomaticallyunchecked.
ThetabschangetoGeneralSettings,BasicInformation,DeploymentModes,Filters,RadiusConfig,Managed
Subnets,StaticRoutes,Logging,andFailover.
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    							AnewlyregisteredInlinePosturenodecomesupwithadefaultIPaddressof192.168.1.100,asubnet
maskof255.255.255.0,andadefaultgatewayof192.168.1.1.Changethesevaluestofityour
deploymentinStep3.
Note
Step 4Clickthefollowingtabsandentertheappropriateinformationforthefieldsinthetabs.
•BasicInformation
•DeploymentModes—AnewlyregisteredInlinePosturenodecomesupinmaintenancemode.For
productionpurposes,youmustchoosetheRoutedorBridgedmode.
•Filters—Enterthesubnetaddressandsubnetmaskfortheclientdevice,ortheMACaddressandIP
addressofthedeviceonwhichtofilter.YoucanuseMACandsubnetfilterstobypassInlinePosture
enforcementtocertainendpointsordevicesontheuntrustedsideofthenetwork.Forexample,ifVPN
orWLCmanagementtrafficisrequiredtopassthroughInlinePosture,youwouldnotwanttosubject
thoseparticularNADstoCiscoISEpolicyenforcement.ByprovidingtheMACaddressandIPaddress
fortheseNADsonafilter,youcanthenaccesstheuserinterfaceorconfigurationterminalbywayof
InlinePosturewithoutrestrictions.
•RadiusConfig—RADIUSconfigurationismandatory.Atleastoneclientandoneserverconfiguration
isnecessaryforInlinePosture.
•ManagedSubnets—ForsubnetsofendpointsthatareinLayer2proximitytotheInlinePosturenode
(suchasaWLC),youmustconfiguremanagedsubnets.ThisconfigurationrequiresanunusedIPaddress
inthesamesubnetasthemanagedsubnet,alongwiththeVLAN(ifany)ofthesubnet.Youcanhave
multiplemanagedsubnetentries.Youmustenterthefollowingvalues:IPAddress,SubnetMask,VLAN
ID,andDescription.
◦StaticRoutes—Enterthesubnetaddress,subnetmask,andchooseTrustedorUntrustedfrom
theInterfaceTypedrop-downlist.Repeatthisstepasneededforyourconfiguration.
WhenthesubnetsoftheendpointsunderCiscoISEcontrolareLayer3awayfromtheInline
Posturenode,astaticrouteentryisneeded.Forexample,ifaVPNgatewaydevice(thatsends
managedsubnettraffictotheInlinePostureuntrustedinterface)istwohopsaway,itsclientsubnet
needstohaveastaticroutedefinedforInlinePosture.Thenetworkonthetrustedsideshouldknow
tosendtraffictotheInlinePosturetrustedinterface.
◦Logging—ClicktheLoggingtabandentertheIPaddressandportnumberfortheloggingserver,
whichistypicallytheMonitoringnode.
AnIPaddressandport(default20514)forloggingInlinePostureeventsaremandatory.This
requirementensuresthattheviablestatusoftheInlinePosturenodeisdisplayedintheCiscoISE
dashboardintheSystemSummarydashlet,andthatotherloginformationregardingthenodesis
available.
◦Failover—ThistabisforInlinePostureHighAvailabilityconfiguration.
Step 5ClickSave.TheInlinePosturenoderestartsautomatically.
Step 6ToverifytheautomaticallygeneratedInlinePostureNADlisting,gotoAdministration>NetworkResources
>DefaultDevice.
Forastandalonenode,theIPaddressforthatnodeisused.Forahigh-availabilitypair,theserviceIPaddress
fortheactivenodeisused.
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    							What to Do Next
TocompletethedeploymentoftheInlinePosturenode,youmustcreateDACLs,authorizationprofiles,and
authorizationpolicyrules:unknown,compliant,andnoncompliant.
Itisimportanttoassociatetheappropriatedownloadableaccesscontrollist(DACL)withthecorresponding
profile.Forexample,theunknownDACLshouldbeassociatedwiththeunknownauthorizationprofile.
Note
Create Inline Posture Downloadable Access Control Lists
Downloadableaccesscontrollists(DACLs)arebuildingblocksforauthorizationprofiles,andtheyprovide
therulesfortheprofilestofollow.Accesscontrollists(ACLs)preventunwantedtrafficfromenteringthe
networkbyfilteringsourceanddestinationIPaddresses,transportprotocols,andothervariables,usingthe
RADIUSprotocol.
AfteryoucreateDACLsasnamedpermissionobjects,addthemtoauthorizationprofiles,whichyouthen
specifyastheresultofanauthorizationpolicy.
Before You Begin
Toperformthefollowingtask,youmustbeaSuperAdminorSystemAdmin.
Procedure
Step 1ChoosePolicy>PolicyElements>Results>Authorization>DownloadableACLs.
Step 2ClickAdd.
Step 3EnterthenameoftheDACLanditsdescription.
Step 4CreatethefollowingDACLs:
•ipn-compliant(PermitAll):Usethefollowingsyntax:permitipanyany
•ipn-noncompliant(DenyAll):Usethefollowingsyntax:denyipanyany
•ipn-unknown(Pre-Posture):UseatleastoneACLtoallowsupplicantsandthePolicyServicenodeto
haveaccesstoeachotherforpostureevaluation.ThisDACLcanbeusedtoblockorquarantineusers
untiltheypassauthentication.Hereisanexamplesyntax:
denytcpanyanyeq80
denytcpanyanyeq443
permitipany10.1.2.40.0.0.0
permitudpanyanyeq53
denyipanyany
Step 5SavetheDACLs.
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Deploy an Inline Posture Node
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    							What to Do Next
CreateInlinePosturenodeprofiles.
Create Inline Posture Node Profiles
YoumustcreatethreeInlinePostureauthorizationprofiles,aswellasanauthorizationprofileforaNAD.
AllInlinePostureinboundprofilesareautomaticallysettocisco-av-pair=ipep-authz=truesothattheInline
PosturenodeappliestheserulesinsteadofproxyingthemontotheNADs.TheURLredirectisessentialfor
clientprovisioning,aswellasagentdiscoveryredirection.
Before You Begin
Toperformthefollowingtask,youmustbeaSuperAdmin,SystemAdmin,orPolicyAdmin.
Procedure
Step 1ChoosePolicy>PolicyElements>Results>Authorization>InlinePostureNodeProfiles.
Step 2ClickAdd.
Step 3Enteranameanddescriptionfortheauthorizationprofile.Supportedcharactersforthenamefieldare:space,
!#$%&‘()*+,-./;=?@_{.
YoucanconfigureaRADIUSReplyMessage=NADProfile,toseeNADProfileintheRADIUS
logmessagesforInlinePosture.Thisconfigurationcanbehelpfulfortroubleshootingatalatertime.
Note
Step 4CreatethefollowingauthorizationprofilesforInlinePosturethatcorrespondtotheDACLsyoucreated.
SpecifytheappropriateDACLforeachofthefollowingauthorizationprofiles:
•IPN-Unknown-Compliant(Pre-Posture):ThisprofilerequiresthatyouenteraURLredirect.Todothis,
checktheURLRedirectcheckbox.
TheURLredirectappearsintheAttributesDetailsfield.
Youareredirectedtoawebpagewhereyoudownloadandinstallanagent.Theagentthenscansyour
system.Ifyoursystempasses,youareautomaticallygrantedfullaccess.Ifyoursystemdoesnotpass,
youaredeniedaccess.
•IPN-Compliant(PermitAll)
•IPN-Noncompliant(DenyAll).
Step 5ClickSubmit.
What to Do Next
CreateanInlinePostureauthorizationpolicy.
Create an Inline Posture Authorization Policy
Authorizationpoliciesprovidethemeansforcontrollingaccesstothenetworkanditsresources.CiscoISE
letsyoudefineanumberofruleswhencreatingauthorizationpolicies.
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    							Theelementsthatdefinetheauthorizationpolicyarereferencedwhenyoucreatepolicyrules.Yourchoice
ofconditionsandattributesdefinestheauthorizationprofile.
Before You Begin
Toperformthefollowingtask,youmustbeaSuperAdminorSystemAdmin.
Procedure
Step 1ChoosePolicy>Authorization.
Step 2Leavethedefaultrulesasis.
Step 3CreatethefollowingUnknownPostureStatusRule:
•IdentityGroup:Any
•Condition:Session:PostureStatusEQUALS=Unknown
•Permissions:IPN-Unknown-Compliant+nad-authorization-profile
Step 4CreatethefollowingCompliantPostureRule:
•IdentityGroup:Any
•Condition:Session:PostureStatusEQUALS=Compliant
•Permissions:IPN-Compliant+nad-authorization-profile
Step 5CreatethefollowingNoncompliantPostureRule:
•IdentityGroup:Any
•Condition:Session:PostureStatusEQUALS=Noncompliant
•Permissions:IPN-Noncompliant+nad-authorization-profile
Step 6Savethepolicy.TheInlinePosturenodedeploymentisnowcomplete.
What to Do Next
ConfigureInlinePosturenodeasRADIUSclientinAdministrationnode.
Configure a High-Availability Pair
WhenyouconfiguretwoInlinePosturenodesforhighavailability,youspecifyonenodeastheprimaryunit
inthepairanditbecomestheactivenodebydefault.Theotherbecomesthesecondarynode,whichisa
standbyunitincaseofdefault.
Ahigh-availabilitynodefailoverpromptsthestandbynodetotakeovertheserviceIPaddress.Afterthis
processoccurs,anadministratormustcorrectthefailedInlinePosturenodeandrevertittotheearlier
configurationasneeded.Becausehigh-availabilityfailoverisstateless,allactivesessionsareautomatically
reauthorizedafterafailoveroccurs.
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Configure a High-Availability Pair
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    							Intheexamplethatispresented,theserviceIPaddressusedforthebridgedmodehighavailabilitypairis
differentfromthephysicalIPaddressesoftheInlinePosturenodes,effectivelycreatingacluster.TheWLC
interactswiththeclusterasasingleunit,usingtheserviceIPaddress.Forthisreason,theserviceIPisdefined
forthetrustedanduntrustednetworks.
Bothnodesinahighavailabilitypairmustusethesamemode,eitherbridgedorrouter.Mixedmodesare
notsupportedonInlinePosturehighavailabilitypairs.
Note
Before You Begin
•Toperformthefollowingtask,youmustbeaSuperAdminorSystemAdmin.
•Youshouldhavesuccessfullyconfiguredtwo(2)InlinePosturenodes,andregisteredthemontheCisco
ISEnetwork.
•Theeth2andeth3interfacesofbothnodesinanInlinePosturehighavailabilitypair(primaryand
secondary)communicatewithheartbeatprotocolexchangestodeterminethehealthofthenodes.For
theheartbeattowork,youmustconnecttheeth2interfaceoftheprimaryInlinePosturenodetotheeth2
interfaceofthesecondarynodeusinganEthernetcable.Likewise,theeth3interfaceoftheprimary
InlinePosturenodemustbeconnectedtotheeth3interfaceofthesecondarynodewithanEthernet
cable.
•ForRADIUSpurposes,youneedaserviceIPaddressthatyouwillassigntoboththetrustedanduntrusted
interfacesoftheInlinePostureactive-standbyclusterduringthecourseofthisprocedure.
•Haveallnecessarynetworkconfigurationinformationforyourinstallationonhand.Checkwithyour
systemarchitectforacompletelistofinformationyouwillneed.
Procedure
Step 1ChooseAdministration>System>Deployment.
Step 2CheckthecheckboxnexttotheInlinePosturenodethatyouwanttodesignateastheprimarynode,andclick
Edit.
Step 3OntheGeneralSettingstab,verifythenodename,thattheInlinePEPcheckboxisselected,thenchoose
ActiveastheHARolefromthedrop-downlist.
Step 4ClicktheFailovertab,andchecktheHAEnabledcheckbox.
Step 5Entertheappropriateinformationinthefields.
Step 6ClickSave.BothInlinePosturenodesrestart.Whenthenodescomebackup,theyareconfiguredasprimary
andsecondary,accordingtothesettingsyouspecified.
Step 7Verifythenodestatusbycheckingthecheckboxnexttoit,andthenclickingtheFailovertab.Ensurethat
yourprimaryandsecondaryInlinePosturenodesareconfiguredcorrectly.
What to Do Next
ConfigureInlinePosturenodeasRADIUSClientinadministrationnode.
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