Cisco Router as a Remote VPN Server using SDM Configuration Example

Introduction

This document describes how to use the Cisco Security Device Manager (SDM) to configure the Cisco router to act as an Easy VPN Server. Cisco SDM allows you to configure your router as a VPN server for the Cisco VPN Client using an easy-to-use Web-based management interface. Once the Cisco router configuration is complete, it can be verified using the Cisco VPN Client.

Prerequisites

Requirements

This document assumes that the Cisco router is fully operational and configured to allow the Cisco SDM to make configuration changes.

Note: Refer to Allowing HTTPS Access for SDM in order to allow the router to be configured by the SDM.

Components Used

The information in this document is based on these software and hardware versions:

• Cisco 3640 Router with Cisco IOS® Software Release 12.3(14T)

• Security Device Manager Version 2.31

• Cisco VPN Client Version 4.8

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Conventions

Refer to the Cisco Technical Tips Conventions for more information on document conventions.

Configure

In this section, you are presented with the information to configure the Easy VPN Server feature which allows a remote end user to communicate using IPsec with any Cisco IOS® VPN gateway.

Note: Use the Command Lookup Tool (registered customers only) to obtain more information on the commands used in this section.

Network Diagram

This document uses this network setup:

Configuration Procedure

Complete these steps to configure the Cisco router as a remote VPN server using SDM.

1. Select Configure > VPN > Easy VPN Server from the Home window and click Launch Easy VPN Server Wizard.

   

2. AAA must be enabled on the router before the Easy VPN Server configuration starts. Click Yes to continue with the configuration.

   The 'AAA has been successfully enabled on the router' message displays on the window. Click OK to start the Easy VPN Server configuration.

   

3. Click Next to start the Easy VPN Server Wizard.

   

4. Select the interface on which the client connections terminate and the authentication type.

   

5. Click Next to configure the Internet Key Exchange (IKE) policies and use the Add button to create the new policy.

   Configurations on both sides of the tunnel must match exactly. However, the Cisco VPN Client automatically selects the proper configuration for itself. Therefore, no IKE configuration is necessary on the client PC.

   

6. Click Next to choose the default transform set or add the new transform set to specify the encryption and authentication algorithm. In this case, the default transform set is used.

   

7. Click Next to create a new Authentication, Authorization, and Accounting (AAA) authorization network method list for group policy lookup or to choose an existing network method list used for group authorization.

   

8. Configure user authentication on the Easy VPN Server.

   You can store user authentication details on an external server such as a RADIUS server or a local database or on both. An AAA login authentication method list is used to decide the order in which user authentication details should be searched.

   

9. This window allows you to add, edit, clone, or delete user group policies on the local database.

   

10. Enter a name for the Tunnel Group Name. Supply the pre-shared key used for authentication information.

    Create a new pool or select an existing pool used to allocate the IP addresses to the VPN Clients.

    

11. This window shows a summary of the actions that you have taken. Click Finish if you are satisfied with your configuration.

    

12. The SDM sends the configuration to the router to update the running configuration. Click OK to complete.

    

13. After completion, you can edit and modify the changes in the configuration, if needed.

    

    Router Configuration (VPN Server)

    Building configuration... Current configuration : 3336 bytes ! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname Router ! boot-start-marker boot-end-marker ! enable password cisco ! aaa new-model ! !--- In order to set AAA authentication at login, use the aaa authentication login !--- command in global configuration mode . aaa authentication login default local !--- Here, list name "sdm_vpn_xauth_ml_1" is specified for !--- the authentication of the clients. aaa authentication login sdm_vpn_xauth_ml_1 local aaa authorization exec default local aaa authorization network sdm_vpn_group_ml_1 local ! aaa session-id common ! resource policy ! ! ! ip cef ! ! ! ! !--- The RSA certificate generates after the !--- ip http secure-server command is enabled. crypto pki trustpoint TP-self-signed-392370502 enrollment selfsigned subject-name cn=IOS-Self-Signed-Certificate-392370502 revocation-check none rsakeypair TP-self-signed-392370502 ! ! crypto pki certificate chain TP-self-signed-392370502 certificate self-signed 01 3082023C 308201A5 A0030201 02020101 300D0609 2A864886 F70D0101 04050030 30312E30 2C060355 04031325 494F532D 53656C66 2D536967 6E65642D 43657274 69666963 6174652D 33393233 37303530 32301E17 0D303530 39323130 30323135 375A170D 32303031 30313030 30303030 5A303031 2E302C06 03550403 1325494F 532D5365 6C662D53 69676E65 642D4365 72746966 69636174 652D3339 32333730 35303230 819F300D 06092A86 4886F70D 01010105 0003818D 00308189 02818100 ED61BD43 0AD90559 2C7D7DB1 BB3147AA 784F3B46 9E63E63C 5CD61976 6BC46596 DB1AEB44 46644B18 8A890604 489B0447 B4B5C702 98272464 FFFD5511 A4BA79EC 239BCEA2 823F94EE 438B2E0A 5D90E9ED 8158BC8D 04F67C21 AEE1DB6F 046A0EF3 4C8798BE 0A171421 3FD5A690 7C735751 E7C58AA3 FB4CCE4F 5930212D 90EB4A33 02030100 01A36630 64300F06 03551D13 0101FF04 05300301 01FF3011 0603551D 11040A30 08820652 6F757465 72301F06 03551D23 04183016 8014B278 183F02DF 5000A124 124FEF08 8B704656 15CD301D 0603551D 0E041604 14B27818 3F02DF50 00A12412 4FEF088B 70465615 CD300D06 092A8648 86F70D01 01040500 03818100 C12AB266 0E85DAF6 264AC86F 27761351 E31DF628 BE7792B2 991725ED AAB3BABE B1F1C6CA 7E5C0D19 B9793439 E5AECC78 C5ECBE56 871EB4D3 39B60AD1 AB0B97FE 515B4CC6 81BEE802 DC02BD1B A0D10EE9 0FD79D72 B44C0143 6E39C06B D9178590 57D02A8F 750DA100 ABEEB1F1 B02A8B1F B746942B 892D1514 B2CC9D58 A28F08E2 quit ! ! ! ! ! ! ! ! ! ! !--- Creates a user account with all privileges. username sdmsdm privilege 15 password 0 sdmsdm ! ! !--- Creates an isakmp policy 1 with parameters like !--- 3des encryption, pre-share key authentication, and DH group 2. crypto isakmp policy 1 encr 3des authentication pre-share group 2 crypto isakmp client configuration group vpn !--- Defines the pre-shared key as sdmsdm. key sdmsdm pool SDM_POOL_1 netmask 255.255.255.0 ! !--- Defines transform set parameters. crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac ! crypto dynamic-map SDM_DYNMAP_1 1 set transform-set ESP-3DES-SHA reverse-route ! !--- Specifies the crypto map parameters. crypto map SDM_CMAP_1 client authentication list sdm_vpn_xauth_ml_1 crypto map SDM_CMAP_1 isakmp authorization list sdm_vpn_group_ml_1 crypto map SDM_CMAP_1 client configuration address respond crypto map SDM_CMAP_1 65535 ipsec-isakmp dynamic SDM_DYNMAP_1 ! ! ! ! interface Ethernet0/0 no ip address shutdown half-duplex ! interface FastEthernet1/0 ip address 10.77.241.157 255.255.255.192 duplex auto speed auto ! interface Serial2/0 ip address 10.1.1.1 255.255.255.0 no fair-queue !--- Applies the crypto map SDM_CMAP1 to the interface. crypto map SDM_CMAP_1 ! interface Serial2/1 no ip address shutdown ! interface Serial2/2 no ip address shutdown ! interface Serial2/3 no ip address shutdown !--- Creates a local pool named SDM_POOL_1 for issuing IP !--- addresses to clients. ip local pool SDM_POOL_1 192.168.2.1 192.168.2.5 !--- Commands for enabling http and https required to launch SDM. ip http server ip http secure-server ! ! ! ! ! control-plane ! ! ! ! ! ! ! ! ! ! line con 0 line aux 0 line vty 0 4 password cisco ! ! end

Verify

Attempt to connect to the Cisco router using the Cisco VPN Client in order to verify that the Cisco router is successfully configured.

1. Select Connection Entries > New.

   

2. Fill in the details of your new connection.

   The Host field should contain the IP address or hostname of the tunnel end point of the Easy VPN Server (Cisco router). The Group Authentication information should correspond to that used in step 9. Click Save when you are finished.

   

3. Select the newly created connection and click Connect.

   

4. Enter a username and password for extended authentication (Xauth). This information is determined by the Xauth parameters in step 7.

   

5. Once the connection is successfully established select Statistics from the Status menu to verify the details of the tunnel.

   This window shows traffic and crypto information:

   

   This window shows split tunneling information if configured:

   

6. Select Log > Log Settings to enable the log levels in the Cisco VPN Client.

   

7. Select Log > Log Windows to view the log entries in the Cisco VPN Client.

   

Related Information

• Downloading and Installing Cisco Router and Security Device Manager
• Cisco VPN Client Support Page
• IPsec Negotiation/IKE Protocols
• Technical Support & Documentation - Cisco Systems