Analysis of Problem Areas
You can divide the problem areas of IPsec VPN on the VPN 3000 Series Concentrator into the following categories based on their implementations:
LAN-to-LAN Tunnel Issues
Remote access VPN Issues
Digital Certificate Issues
Sections that follow discuss in detail the configuration and troubleshooting aspects of these topics.
LAN-to-LAN Tunnel Issues
As mentioned earlier, the Cisco VPN 3000 Series Concentrator can build LAN-to-LAN tunnels with a wide variety of Cisco and non-Cisco devices. It is beyond the scope of this text to discuss the configuration and troubleshooting details of all the devices with which the VPN Concentrator interoperates. Regardless of the types of devices that you have on the other side of the tunnel, configuration for LAN-to-LAN on the VPN Concentrator is the same. This section discusses how to configure a LAN-to-LAN between two Concentrators, which will lead to the discussion of some of the issues and how to resolve them:
Configuration Steps
Troubleshooting Steps
The following sections discuss the configuration and troubleshooting aspects of configuration and troubleshooting of LAN-to-LAN tunnel between two VPN 3000 series Concentrators.