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Anleitung Zusammenfassung
Detection .The user.s end.system connects to the network and transmits data traffic onto the network that traverses the NAC Controller. This traffic is sourced from a MAC address or IP address not previously seen by the controller. 2. Authentication .One of two configurations may be implemented on the NAC Controller for end user authentication. Authentication can be disabled altogether, trusting that the downstream infrastructure devices authenticated the end.system to the network (802.1X authentication to the wireless LAN, web.based authentication to the wired LAN). Alternatively, MAC registration can be implemented, where an end user username and password and/or sponsor username and password must be validated against a backend LDAP.compliant database before network access is permitted. 3. Assessment .After the identity of the end.system or end user is validated by authentication, the NAC Controller requests an assessment of the end.system according to predefined security policy parameters. The assessment can be agent.based or agent.less, and is executed locally by the NAC Controller.s assessment functionality and/or remotely by a pool of assessment servers. 4. Authorization .Once authentication and assessment are complete, the NAC Controller allocates the appropriate network resources to the end.system based on authentication and/or assessment results. This is implemented locally on the NAC Controller by assigning a policy to traffic sourced from this end.system. If authentication fails and/or the assessment results indicate a noncompliant end.system, the NAC Controller can either deny the end.system access to the network or quarantine the end.system by specifying a particular policy on the NAC Controller. 5. Remediation .When the quarantined end user opens a web browser to any web site, its traffic is dynamically redirected to a Remediation web page that describes the compliance violations and provides remediations steps for the user to execute in order to achieve compliance. After taking the appropriate remediation steps, the end user clicks on a button on the web page to reattempt network access, forcing the re.assessment of the end.system. At this point, the Enterasys NAC solution transitions the end.system through the entire NAC cycle of detection, authentication, assessment, and authorization, re.assessing the security posture of the end.system to determine if the remediation techniques were successfully followed. If the end.system is now compliant, the NAC Controller authorizes the end.system with the appropriate access policy. If the end.system is not compliant, the end.system is restricted access to the network by assigning a policy to the end. system on the NAC Controller, and the process starts again. Scenario 4: VPN Remote Access In the VPN remote access use scenario, VPN concentrators act as a termination point for remote access VPN tunnels into the enterprise network. For this use scenario, the NAC Controller appliance is deployed to authorize connecting end. systems on the network and implement network access control. The following figure illustrates how the NAC Controller and the other Enterasys NAC components work together in a VPN remote access deployment to provide a comprehensive NAC solution. Enterasys NAC Design Guide 3-11 Scenario 4: VPN Remote Access Figure 3-6 VPN Remote Access 1 3 3 5 Enterasys NAC Manager NAC Controller (inline appliance) Role=Quarantine1 2 3 4 5 NAC Functions Detect Authenticate Assess Authorize Remediate VPN Concentrator Remediation Web Page 3 4 Assessment Server Scenario 4 Implementation In the VPN remote access use scenario, the five NAC functions are implemented in the following manner with the deployment of the NAC Controller for inline network access control. 1. Detection .The user.s end.system successfully establishes a VPN tunnel with the VPN concentrator, and the VPN concentrator transmits unencrypted data traffic onto the network that traverses the NAC Controller. This traffic is sourced from an IP address not previously seen by the controller. 2. Authentication .Authentication is most likely disabled altogether on the NAC Controller, trusting that the downstream VPN concentrator authenticated the connecting user. 3. Assessment .The NAC Controller requests an assessment of the end.system according to predefined security policy parameters. The assessment can be agent.based or agent.less, and is executed locally by the NAC Controller.s assessment functionality and/or remotely by a pool of assessment servers. 4. Authorization .Once authentication and assessment are complete, the NAC Controller allocates the appropriate network resources to the end.system based on authentication and/or assessment results. This is implemented locally on the NAC Controller by assigning a policy to traffic sourced from the end.system. If authentication fails and/or the assessment results indicate a noncompliant end.system, the NAC Controller can either deny the end.system ac...
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