2 Site 2 Site VPN Connections to same subnet

Hi all,

I have some trouble to handle two IPSec-Site-2-Site VPN connections to the same subnet over 2 differnet GW.

Scenario:
- GW A is default gateway
- GW B is the backup gateway

If GW A crashes it should switch the route to GW B but if GW A is up again it should switch the VPN Route to GW B off.

The error message from the VPN Live Protocol is:

.... cannot route -- route already in use for ....

Any idea how to set a GW A as default route and GW B as backup route?

Looking forward for any help :)

Cheers and regards