Reference Manual

HOW TO use NAT32 in the presence of a Cisco VPN Connection.

Problem

You have correctly configured NAT32 to bind to your Internet Adapter and your Private LAN Adapter, and all private machines have Internet access as long as no Cisco VPN Connection is established. Once you disconnect the Cisco VPN Connection, the private machines can again communicate with the Internet.

Solution

When you installed the Cisco VPN Client Software, its installer will have bound a Protocol called Cisco VPN Transport to both your Internet Adapter and your Private LAN Adapter. That protocol will prevent NAT32 from sending and receiving packets over the Private LAN for the duration of such a VPN connection.

To fix this, simply unbind the Cisco VPN Transport from your Private LAN Adapter. You do this in Control Panel, Network by unchecking the relevant checkbox in the Properties of your Private LAN Adapter.

These kinds of problems often occur with generic Setup programs and Installers. The Installer has no notion of Internet-connected and Private LAN Adapters, and so it simply binds the new Transport Protocol to all adapters it finds in the machine, even though it is only required for the Internet-connected Adapter.

SEE ALSO

How-To
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