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Model 4: End-System Authorization with Assessment and Remediation
Enterasys NAC Design Guide 2-13
Assistedremediationinformsenduserswhentheirend‐systemshavebeenquarantineddueto
networksecuritypolicynon‐compliance,andallowsenduserstosafelyremediatetheirnon‐
compliantend‐systemswithoutassistancefromIToperations.Theprocesstakesplacewhenan
end‐systemconnectstothenetworkandassessmentis
performed.Enduserswhosesystemsfail
assessmentarenotifiedviawebredirectionthattheirsystemshavebeenquarantined,andare
instructedinhowtoperformself‐serviceremediationspecifictothedetectedcompliance
violations.
Oncetheremediationstepshavebeensuccessfullyperformedandtheend‐systemiscompliant,
theend
usercaninitiateanon‐demandreassessmentoftheend‐systemandcanbeallocatedthe
appropriatenetworkresources,againwithouttheinterventionofIToperations.
Implementation
InModel4,end‐systemscanbedetected,authenticated,assessed,authorized,andremediatedin
differentwaysdependingonthewhetherinlineorout‐of‐bandnetworkaccesscontrolis
implementedintheEnterasysNACsolution.
Out-of-Band NAC
Forout‐of‐bandEnterasysNACdeploymentsutilizingtheNACGateway,NACfunctionsare
implementedinthefollowingway:
Detection‐AsdescribedinModel2.
Authentication‐AsdescribedinModel2.
Assessment‐AsdescribedinModel3.
Authorization‐AsdescribedinModel3.
Remediation‐Whenend‐systemsarequarantinedbytheNACGateway,
thenetworkmustbe
configuredtodirectalltrafficfromthequarantinedend‐systemstotheNACGateway.Thiscanbe
implementedbyconfiguringpolicy‐basedroutingonarouterinlinewiththetrafficsourcedfrom
quarantinedend‐systems.Thisrouterwouldbeconfiguredtosendallwebtrafficfrom
quarantined
end‐systemstotheNACGateway,whichthenservesbacktheremediationwebpage
totheenduser.
Thewaytherouteridentifiesthetrafficfromquarantinedend‐systemsdiffersbetweenanetwork
composedofpolicy‐enabledswitchesintheaccessedgeoranetworkcomposedofswitches
implementingRFC
3580dynamicVLANassignmentintheaccessedge.ForanEnterasyspolicy‐
enablededge,theQuarantinepolicycanbeconfiguredtorewritetheTypeofService(ToS)valueof
HTTPtraffictoaparticularsettingthatmatchesthepolicy‐basedroutingconfiguration.Foran
RFC3580capableedge,thepolicy‐based
routingwouldbeconfiguredtomatchthesourceIP
addressoftheHTTPtrafficbeinggeneratedfromthesubnetsthatcorrespondstotheQuarantine
and/orAssessingVLAN.Ineithercase,bydirectingtheHTTPtrafficfromquarantinedend‐
systemsovertotheNACGateway,theNACGatewaywillserveback
theremediationwebpageto
thenoncompliantend‐sy stem.
- Enterasys 1
- Contents 5
- Chapter 3: Use Scenarios 6
- Chapter 4: Design Planning 6
- Chapter 5: Design Procedures 6
- About This Guide 9
- Getting Help 10
- Overview 11
- Deployment Models 12
- NAC Solution Overview 13
- NAC Solution Components 14
- NAC Gateway Appliance 15
- NAC Controller Appliance 15
- 1-6 Overview 16
- Appliance Comparison 17
- 1-8 Overview 18
- NetSight Management 19
- RADIUS Server 20
- Assessment Server 20
- 1-12 Overview 22
- NAC Deployment Models 23
- Features and Value 24
- Implementation 26
- User-Based Authorization 28
- MAC Registration 28
- Inline NAC 31
- Remediation 34
- 2-16 NAC Deployment Models 38
- Use Scenarios 39
- Policy-Enabled Edge 40
- RFC 3580 Capable Edge 41
- Scenario 1 Implementation 42
- Thin Wireless Edge 43
- 3-6 Use Scenarios 44
- Thick Wireless Edge 45
- Scenario 2 Implementation 46
- 3-10 Use Scenarios 48
- Scenario 4: VPN Remote Access 49
- Scenario 4 Implementation 50
- 3-14 Use Scenarios 52
- Design Planning 53
- Survey the Network 54
- 4-4 Design Planning 56
- End-System Capabilities 58
- Authentication Considerations 59
- 4-8 Design Planning 60
- Wired LAN 61
- Wireless LAN 61
- Remote Access WAN 62
- Site-to-Site VPN 62
- Remote Access VPN 63
- 4-12 Design Planning 64
- Design Procedures 65
- 5-2 Design Procedures 66
- NAC Configurations 67
- Authentication 68
- Assessment 68
- Authorization 69
- 5-6 Design Procedures 70
- 5-8 Design Procedures 72
- 5-10 Design Procedures 74
- MAC Overrides 76
- 5-14 Design Procedures 78
- User Overrides 80
- Assessment Design Procedures 81
- 5-18 Design Procedures 82
- 5-20 Design Procedures 84
- 5-22 Design Procedures 86
- 6. VLAN Configuration 88
- 7. Policy Role Configuration 88
- 8. Define NAC Access Policies 88
- Assessment Policy 90
- Quarantine Policy 91
- Inline NAC Design Procedures 92
- 7S4280-19-SYS Up to 2000 94
- 2S4082-25-SYS Up to 2000 94
- 5-32 Design Procedures 96
- Additional Considerations 97
- 5-34 Design Procedures 98
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