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Out-of-Band NAC Design Procedures
Enterasys NAC Design Guide 5-19
configurationifthesecurityvulnerabilityisconsideredariskfortheorganization.Formore
informationonNessus,refertohttp://nessus.org/.
Out-of-Band NAC Design Procedures
ThefollowingsectioncontinuestheEnterasysNACdesignprocedurewithstepsspecifically
relatingtotheimplementationofout‐of‐bandNACwiththeNACGateway.
1. Identify Network Authentication Configuration
SinceNACGatewaysutilizeauthenticationforthedetectionofconnectingend‐systems,itis
necessarytoidentifywhichauthenticationmethodsaretobeconfiguredintheintelligentedgeof
thenetwork.Formoreinformationonevaluatingauthenticationonthenetwork,see“Surveythe
Network”(page 4‐2).
Thefollowingconsiderationsshouldbe
takenintoaccountwhendeployingauthenticationonthe
network:
•Thecapabilitiesofend‐systemsconnectingtothenetwork.
Human‐centricdevicesmaysupportuser‐basedauthenticationmethodssuchas802.1X or
web‐basedauthenticationonlyifan802.1Xsupplicantorawebbrowserissupportedonthe
end‐system.Machine‐centric
devicesmostlikelyonlysupportdevice‐basedauthentication
methodslikeMACauthentication.
•Thetypesofusersconnectingtothenetwork.
Itisnecessarytounderstandhowauthenticationaffectsthedifferenttypeofusersconnecting
tothenetworkandwhatimplicationsthishasontheNACsolution.Forexample,while
trustedusers
authenticateusingasetofvalidcredentialsheldinadirectoryonthenetwork,
untrustedorguestusersmayfailauthenticationuponconnection.
•Thecomplexityinvolvedindeployingauthenticationonthenetwork,ifitisnotyetdeployed.
Rollingout802.1Xauthenticationonthenetworkrequiresextensiveplanningandmandates
configuration
andpossibleupgradeofinfrastructuredevicesandend‐systems,andthe
disseminationofcredentialstoconnectingusersanddevices.Sincethisisasignificant
undertaking,itmaybedesirabletoutilizeMAC‐basedauthenticationfortheinitialrolloutof
NACandmigrateoverto802.1Xoveraperiodoftime.
Thisway,mostbenefitsofNACcanbe
obtainedintheshorttermwhiletheinfrastructureisreadiedforafull802.1Xauthentication
rollout.
•Theauthenti cationmethodsupportedbytheintelligentedgeofthenetwork.
Edgeinfrastructuredevicesmayneedtosupportmultipleauthentication methods
concurrentlytoaccountfordifferentdevices
connectingtothenetwork.Furthermore,the
authenticationandauthorizationofmultipledevicesonasingleportmayalsoneedtobe
supported.
- 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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