Easy VPN Remote RSA Signature Support

First Published: March 1, 2004
Last Updated: December 24, 2010

The Easy VPN Remote RSA Signature Support feature provides support for the Rivest, Shamir, and Adleman (RSA) signatures on Easy VPN remote devices. The support is provided through RSA certificates that can be stored on or off the remote devices.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the "Feature Information for Easy VPN Remote RSA Signature Support" section.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Contents

•Prerequisites for Easy VPN Remote RSA Signature Support

•Restrictions for Easy VPN Remote RSA Signature Support

•Information About Easy VPN Remote RSA Signature Support

•How to Configure Easy VPN Remote RSA Signature Support

•Additional References

•Feature Information for Easy VPN Remote RSA Signature Support

Prerequisites for Easy VPN Remote RSA Signature Support

•You must have a Cisco Virtual Private Network (VPN) remote device and be familiar with configuring the device.

•You must have a certification authority (CA) available to your network before you configure this interoperability feature. The CA must support the public key infrastructure (PKI) protocol of Cisco Systems, which is the Simple Certificate Enrollment Protocol (SCEP) (formerly called certificate enrollment protocol [CEP]).

•You should be familiar with IP Security (IPsec) and PKI and with configuring RSA key pairs and CAs.

Restrictions for Easy VPN Remote RSA Signature Support

•This feature should be configured only when you configure both IPsec and Internet Key Exchange (IKE) on your network.

•Easy VPN does not support RSA signature and preshared key authentication at the same time. A router can have one or more RSA signature-authenticated Easy VPN tunnels or preshared key-authenticated Easy VPN tunnels. However, only tunnels with the same authentication method are up at any time.

•The Cisco IOS software does not support CA server public keys that are greater than 2048 bits.

Information About Easy VPN Remote RSA Signature Support

•Easy VPN Remote RSA Signature Support Overview

Easy VPN Remote RSA Signature Support Overview

The Easy VPN Remote RSA Signature Support feature allows you to configure RSA signatures on your Easy VPN remote device. The signatures can be stored on or off your remote device.

How to Configure Easy VPN Remote RSA Signature Support

•Configuring Easy VPN Remote RSA Signature Support

•Configuring Easy VPN Remote RSA Signature Support

Configuring Easy VPN Remote RSA Signature Support

To enable the RSA signatures, when you are configuring the Easy VPN remote and assigning the configuration to the outgoing interface, you must omit the group command. The content of the first Organizational Unit (OU) field will be used as the group. For information about configuring Cisco Easy VPN remote devices, refer to the Cisco Easy VPN Remote module.

Troubleshooting Easy VPN RSA Signature Support

To troubleshoot your Easy VPN remote RSA signature configuration, you can use the following debug commands. The debug commands can be used in any order or individually.

SUMMARY STEPS

1. enable

2. debug crypto ipsec client ezvpn

3. debug crypto isakmp

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

debug crypto ipsec client ezvpn

Example:

Router# debug crypto ipsec client ezvpn

Displays information about the VPN tunnel as it relates to the Easy VPN remote configuration.

Step 3 

debug crypto isakmp

Example:

Router# debug crypto isakmp

Displays messages about IKE events.

Additional References

Related Documents

Related Topic
Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

Security commands

Cisco IOS Security Command Reference

Configuring Internet Key Exchange for IPsec VPNs

Configuring Internet Key Exchange for IPsec VPNs

Deploying RSA keys

Deploying RSA Keys Within a PKI

Certificate Authorities

•Easy VPN Server

•Cisco IOS PKI Overview: Understanding and Planning a PKI

•Deploying RSA Keys Within a PKI

•Configuring Certificate Enrollment for a PKI

Configuring a Cisco Easy VPN remote device

Cisco Easy VPN Remote


Standards

Standard
Title

None

—


MIBs

MIB
MIBs Link

None

To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs


RFCs

RFC
Title

None

—


Technical Assistance

Description
Link

The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

http://www.cisco.com/cisco/web/support/index.html


Feature Information for Easy VPN Remote RSA Signature Support

Table 1 lists the features in this module and provides links to specific configuration information.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Note Table 1 lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Table 1 Feature Information for Easy VPN Remote RSA Signature Support 

Feature Name
Releases
Feature Information

Easy VPN Remote RSA Signature Support

12.3(7)T1
12.2(33)SRA
12.2(33)SXH

The Easy VPN Remote RSA Signature Support feature provides for the support of Rivest, Shamir, and Adleman (RSA) signatures on Easy VPN remote devices. The support is provided through RSA certificates that can be stored on or off the remote device.

The following sections provide information about this feature:

•Easy VPN Remote RSA Signature Support Overview

•Configuring Easy VPN Remote RSA Signature Support

The following commands were introduced or modified: debug crypto ipsec client ezvpn, debug crypto isakmp.


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Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

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