I have an NHS in the US and another NHS in Europe (both using the same network ID, unfortunatley). Different DSL sites connect to different hubs depending on their location. Most of these sites are using the DMVPN as a backup, but there are a handfull of sites that are using the DMVPN over DSL as there primary. For these sites, which are all connected to the NHS in the US, I would like to configure a second tunnel to the hub in Europe for redundancy. Since the NHS in Europe uses the same network-id as the the DMVPN in the US, I need to create a second VPN. Is it possible to use the same router as the hub for both DMVPN networks? it seems I am able to get Phase 1 to come up, but I am not able to get Phase 2 and IPSec to come up. Are there any other caveats to this solution that you can think of?
I have this problem too.