Backing up a VPN gateway with an ISDN gateway and RIP

Going a step further, the VPN gateways themselves can be backed up in case of failure. This case assumes the existence of a VPN connection between two gateways. In the event that one of the two VPN devices should fail, an ISDN connection is to take over the data transfer; in this case via a direct dial-in connection.





Regarding the configuration of this solution, we again assume a functional VPN connectivity of the two networks. The following additional steps are required:

If there is a disturbance in the connection between the VPN devices, the value for the distance of the corresponding routes changes automatically: A route which is not available is marked with a distance of 16. Consequently, the route entered into the ISDN router automatically becomes the "better" solution and all data packets will be re-routed over the ISDN connection. As soon as the VPN connection is re-established, the distance changes to a value below that of the ISDN connection and the backup will be terminated as intended.

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