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17.01.2016
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A Remote Access VPN consists of one Remote Access VPN Server or Site-to-Site VPN Gateway, and one or more Remote Access VPN Clients. On the remote user VPN site's UTM-1 appliance, add the office Remote Access VPN Server as a Remote Access VPN site.See Adding and Editing VPN Sites . On the office VPN site's UTM-1 appliance, enable a Remote Access VPN Server.See Setting Up Your UTM-1 Appliance as a VPN Server. This document provides a step-by-step guide on how to configure the Cisco Network Admission Control (NAC) Appliance (formerly Cisco Clean Access) for remote access VPN in In-band Virtual Gateway mode. The information in this document was created from the devices in a specific lab environment.
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Choose Device Management > CCA Servers and go to the New Server tab in order to add the Cisco Clean Access Server (CAS) to the Cisco CAM.
Check Enable Layer 3 support in order to allow users to be more than one hop away from the CAS. Under the CCA Server Advanced tab click VLAN Mapping and enter the VLAN information in order to map VLAN 10 (untrusted) with VLAN 20 (trusted). Create a filter for the Cisco ASA to be able to communicate with the protected network behind the CAS. Choose User Management > User Roles and go to the Traffic Control tab in order to configure the policies used by each user role. Choose Device Management > Clean Access, go to the General Setup tab, and click Agent Login. The NAC Appliance (Cisco Clean Access) provides integration with Cisco VPN Concentrators and the Cisco ASA (in this example). Default Rolea€”Choose the unauthenticated role as the user role assigned to users authenticated by this provider. NAS-Identifiera€”The NAS-Identifier value to be sent with all RADIUS authentication packets. NAS-IP-Addressa€”The NAS-IP-Address value to be sent with all RADIUS authentication packets. Enable Failovera€”This enables sending a second authentication packet to a RADIUS failover peer IP if the primary RADIUS authentication server response times out. Allow Badly Formed RADIUS Packetsa€”This enables the RADIUS authentication client to ignore errors in badly-formed RADIUS authentication responses as long as the responses contain a success or failure code.
Check Single Sign-On and Auto Logout and enter the RADIUS Accounting Port (only port 1813 is supported).


Under the VPN Concentrators sub-tab enter the ASA information and click Add VPN Concentrator. Under the Accounting Servers sub-tab enter the RADIUS Accounting Server information and click Add Accounting Server. This section demonstrates how to configure the Cisco ASA using the Adaptive Security Device Manager (ASDM). Choose Configuration > VPN and click Launch VPN Wizard in order to launch the VPN Wizard.
Use the VPN Tunnel Type panel in order to select the type of VPN tunnel to define, remote access or LAN-to-LAN, and to identify the interface that connects to the remote IPsec peer.
Use the Client Authentication panel in order to select the method by which the Security Appliance authenticates remote users.
Use the Attributes Pushed to Client (Optional) window in order to have the Security Appliance pass information about DNS and WINS servers and the default domain name to remote access clients.
Use this IPSec Encryption and Authentication window in order to select the encryption and authentication methods to use for Phase 2 IKE negotiations, which create the secure VPN tunnel. Complete these steps in order to add the CAS as the accounting server for the VPN group you configured (vpngroup in this example). Under the Accounting tab select the new AAA Server Group under the Accounting Server Group pull-down menu (CAS_Accounting in this example).
There is currently no specific troubleshooting information available for this configuration. You can use this type of VPN to make an office network remotely available to authorized users, such as employees working from home, who connect to the office Remote Access VPN Server with their Remote Access VPN Clients. The Cisco NAC Appliance is an easily deployed NAC product that uses the network infrastructure to enforce security policy compliance on all devices that seek to access network computing resources. The CAS is typically configured such that the untrusted interface is connected to a trunk port with multiple VLANs trunked to the port.
Enter a meaningful or recognizable name if web login users are able to select providers from the web login page. Supported methods include EAPMD5, Password Authentication Protocol (PAP), Challenge Handshake Authentication Protocol (CHAP), and Microsoft (MS-CHAP).
This default role is used if not overridden by a role assignment based on MAC address or IP address, or if RADIUS mapping rules do not result in a successful match.
Cisco VPN Client Release 3.x or higher, or other Easy VPN Remote product is used in this example, since the clients use the Cisco VPN Client.
Enter the pre-shared key (cisco123 in this example) and the VPN Tunnel Group Name (vpngroup in this example). 3DES, SHA, and Diffie-Hellman Group 2 are used in this example as the IKE policy for VPN Client connections.


By default, the Security Appliance hides the real IP addresses of internal hosts and networks from outside hosts by using dynamic or static Network Address Translation (NAT). The Cisco ASA needs to send the RADIUS accounting messages to the CAS in order to do SSO and perform security posture checks. With the NAC Appliance, network administrators can authenticate, authorize, evaluate, and remediate wired, wireless, and remote users and their machines prior to network access. If your network is live, make sure that you understand the potential impact of any command. In such a situation, the management VLAN ID is the VLAN ID of the VLAN to which the IP address of the CAS belongs. Requiring the use of the Clean Access Agent is configured per user role and operating system.
NAT minimizes risks of attack by untrusted outside hosts, but might be improper for those who have been authenticated and protected by VPN. It identifies whether networked devices such as laptops, IP phones, or game consoles are compliant with the security policies of your network and repairs any vulnerabilities before access to the network is permitted. When the Agent is required for a role, users in that role are forwarded to the Clean Access Agent download page after authenticating for the first time using web login. At the end of the installation, the user is prompted to log into the network using the Agent. In order to do this, you need to add the Cisco VPN device (Cisco ASA in this example) as an authentication server.
If the Security Appliance has multiple interfaces, you need to plan the VPN configuration before you run this wizard and identify the interface to use for each remote IPsec peer with which you plan to establish a secure connection. The virtual gateway configuration is good when managed clients share a subnet with trusted clients and you do not want to modify the existing gateway or architecture. The Cisco ASA needs to communicate with devices such as the Cisco Secure ACS server in the trusted side.
Step 11 was repeated to allow UDP and TCP traffic for the sales and engineering users to their respective subnets. This enables IPsec authenticated inbound sessions to always be permitted through the Security Appliance (that is, without a check of the interface access-list statements).
Click on Clean Access under Device Management and choose Certified Devices > Add Floating Device.




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