Enterasys Networks 9034385 manual NAC Gateway Appliance, NAC Controller Appliance

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NAC Solution Components

Enterasys offers two types of NAC appliances: the NAC Gateway appliance implements out‐of‐ band network access control, and the NAC Controller appliance implements inline network access control. The following section describes how each NAC appliance implements network access control for connecting end‐systems.

NAC Gateway Appliance

The NAC Gateway is utilized to implement out‐of‐band network access control for connecting end‐systems. With the NAC Gateway, connecting end‐systems are detected on the network through their RADIUS authentication interchange. Based on the assessment and authentication results for a connecting device, RADIUS attributes are added or modified during the authentication process to authorize the end‐system on the authenticating edge switch. Therefore, the NAC Gateway can be positioned anywhere in the network topology with the only requirement being that IP connectivity between the authenticating edge switches and the NAC Gateways is operational.

The NAC Gateway requires the implementation of intelligent wired or wireless edge infrastructure devices as the authorization point for connecting end‐systems. Intelligent edge devices are capable of supporting authentication and authorization based on the authentication message interchange. Depending on the appliance model, the NAC Gateway provides either integrated assessment server functionality and/or the ability to connect to external assessment services, to determine the security posture of end‐systems connecting to the network.

Three NAC Gateway models are available to meet the needs of different‐sized implementations and assessment server requirements.

•SNS‐TAG‐ITA supports up to 3000 concurrent end‐systems and provides integrated assessment servers. (A separate license is required for integrated assessment.) This integrated NAC Gateway supports both agent‐less (network‐based) and agent‐based assessment. In addition to having the capability to run as an integrated appliance, it also has the capability to run as an assessment server (scanner) only. The SNS‐TAG‐ITA also supports the ability to connect to multiple external assessment servers including Nessus and Lockdown Enforcer.

•SNS‐TAG‐HPA supports up to 3000 concurrent end‐systems and supports the ability to connect to multiple external assessment servers including Nessus and Lockdown Enforcer.

•SNS‐TAG‐LPA supports up to 2000 concurrent end‐systems and supports the ability to connect to multiple external assessment servers including Nessus and Lockdown Enforcer.

NAC Controller Appliance

The NAC Controller is utilized to implement inline network access control for connecting end‐ systems. With the NAC Controller, connecting end‐systems are detected through the receipt of a packet from a new end‐system. Based on the assessment and authentication results for a connecting device, the authorization of the end‐system is implemented locally on the NAC Controller appliance by assigning a set of traffic forwarding rules, referred to as “policy,” to all traffic sourced by the end‐system. The NAC Controller appliance is positioned strategically in the network topology within the end user LAN segment or across routed boundaries, inline with data traffic sourced from end‐systems. Since this appliance exists in the data path of networked devices, it has been designed to achieve multi‐gigabit throughput with hardware‐based traffic forwarding, by leveraging customized Enterasys‐built Application Specific Integrated Circuits (ASICs).

The NAC Controller is applicable to scenarios where non‐intelligent wired or wireless edge infrastructure devices are deployed in the network. Non‐intelligent edge devices are not capable

Enterasys NAC Design Guide 1-5

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Contents Enterasys Page Page Page Contents Design Procedures Use ScenariosDesign Planning Tables FiguresPage Related Documents Intended AudienceSupport@enterasys.com Getting HelpDetection NAC Solution OverviewAuthentication Key Functionality Remediation Authorization Deployment Models AssessmentModel 2 End-System Authorization Model 3 End-System Authorization with AssessmentModel 1 End-system Detection and Tracking NAC Appliance NAC Solution ComponentsNAC Controller Appliance NAC Gateway ApplianceNAC Controller is available in two models NAC Gateway NAC Controller Appliance ComparisonDisadvantage Advantage NetSight NAC Manager NetSight ManagementSummary Radius ServerAssessment Server Summary Summary Overview Model 1 End-System Detection and Tracking ImplementationOut-of-Band NAC Features and Value Inline NAC LayerEnd-System and User Tracking Required and Optional Components Model 2 End-System AuthorizationInline NAC Device-Based Authorization Location-Based AuthorizationMAC Registration User-Based AuthorizationComponent Requirements for Authorization Model 3 End-System Authorization with Assessment Inline NAC Extensive Security Posture Compliance Verification Diverse Security Posture Compliance Verification Component Requirements for Authorization with Assessment Implementation Self-Service Remediation Required and Optional Components Enterasys NAC Deployment Models Value Use Scenarios Scenario 1 Intelligent Wired Access EdgeNAC Functions Policy-Enabled EdgeVLAN=Production RFC 3580 Capable EdgeScenario 1 Implementation Thin Wireless Edge Scenario 2 Intelligent Wireless Access EdgeRemediation Web User Laptop Thick Wireless Edge Scenario 2 Implementation Scenario 3 Non-intelligent Access Edge Wired and Wireless Layer 2 Wired LAN Scenario 3 Implementation Scenario 4 VPN Remote AccessScenario 4 Implementation VPN Remote Access EnterasysUse Scenario Summaries Summary and Appliance Requirements VPN remote access Identify the NAC Deployment Model Design PlanningIdentify the Intelligent Edge of the Network Survey the NetworkNetwork with Intelligent Edge Case #1 No authentication method is deployed on the network Evaluate Policy/VLAN and Authentication ConfigurationOverview of Supported Authentication Methods Case #2 Authentication methods are deployed on the networkSupport of Multiple Authentication Methods End-System CapabilitiesSupport for Multiple End-System Connection Authentication Considerations Authentication Support on Enterasys DevicesIdentify the Strategic Point for End-System Authorization Identify Network Connection Methods Wired LANWireless LAN Thick Wireless DeploymentsRemote Access WAN Thin Wireless DeploymentsSite-to-Site VPN Identify Inline or Out-of-band NAC Deployment Remote Access VPNSummary Identify Required NetSight Applications Procedures for Out-of-Band and Inline NACDefine Network Security Domains Security Domain NAC ConfigurationsNAC Configuration Authorization NAC Configuration for a Security Domain Procedures for Out-of-Band and Inline NAC To the network Procedures for Out-of-Band and Inline NAC Procedures for Out-of-Band and Inline NAC Security Domain Configuration Guidelines for Assessment MAC Overrides Identify Required MAC and User OverridesMAC and User Override Configuration Procedures for Out-of-Band and Inline NAC Procedures for Out-of-Band and Inline NAC User Overrides Determine the Number of Assessment Servers Assessment Design ProceduresDetermine Assessment Server Location Identify Assessment Server ConfigurationIdentify Network Authentication Configuration Out-of-Band NAC Design ProceduresDetermine the Number of NAC Gateways NAC Gateway Redundancy Determine NAC Gateway Location Determine End-System Mobility Restrictions Identify Backend Radius Server InteractionVlan Configuration Policy Role ConfigurationDefine NAC Access Policies Assessment Policy and Quarantine Policy Configuration Failsafe Policy and Accept Policy ConfigurationAssessment Policy Policy Role Configuration in NetSight Policy ManagerQuarantine Policy Service for the Assessing RoleInline NAC Design Procedures Determine NAC Controller LocationUnregistered Policy Inline NAC Design Procedures Determine the Number of NAC Controllers Layer 2 NAC Controller Redundancy Define Policy Configuration Additional Considerations NAC Deployment With an Intrusion Detection System IDSNAC Deployment With NetSight ASM Additional Considerations Design Procedures
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